CN103616231A - Generalized displacement strain monitoring progressive identification method for damaged cable and concentrated loads - Google Patents

Generalized displacement strain monitoring progressive identification method for damaged cable and concentrated loads Download PDF

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CN103616231A
CN103616231A CN201310662323.2A CN201310662323A CN103616231A CN 103616231 A CN103616231 A CN 103616231A CN 201310662323 A CN201310662323 A CN 201310662323A CN 103616231 A CN103616231 A CN 103616231A
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cable
temperature
data
vector
point
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CN201310662323.2A
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韩玉林
宋佰涵
韩佳邑
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东南大学
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Publication of CN103616231A publication Critical patent/CN103616231A/en

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Abstract

The invention relates to a generalized displacement strain monitoring progressive identification method for a damaged cable and concentrated loads. On the basis of strain monitoring, whether a mechanical calculation reference model of a cable structure needs to be updated or not is determined by monitoring generalized displacement of a supporting seat, temperature of the cable structure, environment temperature, change degree of the concentrated loads and damage degree of the damaged cable, a new mechanical calculation reference model of the cable structure taking the generalized displacement of the supporting seat, the change degree of the concentrated loads, the damage degree of the damaged cable and the temperature into consideration is obtained, on the basis of the model, according to the approximate linear relation between current numeric vectors of monitored quantities, current initial numeric vectors of the monitored quantities, a numerical value changing matrix of unit damage monitored quantities, and current nominal damage vectors to be solved, influences of interference factors can be eliminated when the generalized displacement of the supporting seat exists and the temperature changes, and the damaged cable and variable quantities of the concentrated loads can be identified accurately.

Description

The laddering recognition methods of generalized displacement strain monitoring damaged cable centre-point load
Technical field
Cable-stayed bridge, suspension bridge, the structures such as truss-frame structure have a common ground, be exactly that they have many parts that bear tensile load, as suspension cable, main push-towing rope, hoist cable, pull bar etc., the common ground of this class formation is with rope, cable or the rod member that only bears tensile load are support unit, for simplicity, this method is " Cable Structure " by such structure representation, and by all ropeway carrying-ropes of Cable Structure, carrying cable, and all rod members (being called again two power rod members) that only bear axial tension or axial compression load, unification is called " cable system " for simplicity, in this method, with " support cable " this noun, censure ropeway carrying-rope, carrying cable and only bear the rod member of axial tension or axial compression load, sometimes referred to as " rope ", so when using " rope " this word in the back, truss-frame structure reality is just referred to two power rod members.In structure military service process, the correct identification of the health status of support cable or cable system is related to the safety of whole Cable Structure.When environment temperature changes, the temperature of Cable Structure generally also can be along with changing, when Cable Structure temperature changes, may there is generalized displacement in Cable Structure bearing, the centre-point load that Cable Structure is born also may change, the health status of Cable Structure also may change simultaneously, at this complex condition, this method is identified the variable quantity of the centre-point load that damaged cable and Cable Structure bear based on strain monitoring (this method is called monitored strain " monitored amount "), belong to engineering structure health monitoring field.
Background technology
Reject load change, Cable Structure generalized displacement of support and structure temperature and change the impact on Cable Structure health status recognition result, thereby the variation of the health status of recognition structure is exactly current problem in the urgent need to address; Same, the impact of the recognition result of the variable quantity of the centre-point load that the variation of rejecting structure temperature, Cable Structure generalized displacement of support and structural health conditions variation are born structure, significant equally to structural safety, this method discloses a kind of effective ways that solve these two problems.
Support cable is impaired is safely a significant threat to Cable Structure, and the damaged cable of identifying based on structural health monitoring technology in the cable system of Cable Structure is a kind of method that has potentiality.
When changing appears in the centre-point load of bearing when Cable Structure, or Cable Structure generalized displacement of support, or the temperature of Cable Structure is when change, for example, or the health status of cable system is while changing (damaging), or when four kinds of situations occur simultaneously, can cause the variation of the measurable parameter of Cable Structure, for example can cause the variation of Suo Li, can affect distortion or the strain of Cable Structure, can affect shape or the volume coordinate of Cable Structure, can cause variation (for example variation of the angle coordinate of the straight line of any this point of mistake in the section of body structure surface any point of angle coordinate of any imaginary line of the every bit of Cable Structure, or the variation of the angle coordinate of the normal of body structure surface any point), all these change the health status information that has all comprised cable system, also the variable quantity information that has comprised centre-point load, that is to say the variable quantity that can utilize the measurable parameter of Cable Structure to identify damaged cable and centre-point load.
When bearing has generalized displacement, current published technology, in method, some only can be when other all conditions be constant the variation of (load of only only having structure to bear changes) recognition structure bearing load, the variation of some recognition structure health status of only can (only only having structural health conditions to change) when other all conditions is constant, the variation of some only can (only only have structure temperature and structural health conditions to change) when other all conditions is constant recognition structure (environment) temperature and structural health conditions, also do not have at present a kind of disclosed, effective method is recognition structure bearing load simultaneously, the variation of structure (environment) temperature and structural health conditions, when the load of bearing in structure in other words and structure (environment) temperature changes simultaneously, also there is no the variation that effective method can recognition structure health status, and the load that structure is born and structure (environment) temperature usually changes, so during the load of how to bear in structure and structure (environment) temperature variation, reject load change and structure temperature and change the impact on Cable Structure health status recognition result, thereby the variation of the health status of recognition structure exactly, it is current problem in the urgent need to address, this method discloses a kind of method, when bearing has generalized displacement, when the centre-point load that can bear in Cable Structure and structure (environment) temperature changes, reject generalized displacement of support, load change and structure temperature change the impact on Cable Structure health status recognition result, based on monitored amount, monitor to identify damaged cable, the safety of Cable Structure is had to important value.
Same, in current disclosed method, thereby also do not occur rejecting the correct knowledge method for distinguishing of realizing centre-point load intensity of variation of generalized displacement of support, structure temperature variation and the impact of support cable health status, and concerning structure, the identification of load change is also very important.This method, when identifying damaged cable, can also identify the variation of centre-point load simultaneously, and this method can be rejected generalized displacement of support, structure temperature changes and the impact of support cable health status variation, realizes the correct identification of centre-point load intensity of variation.
That is to say, this method has realized two kinds of functions that existing method can not possess.
Summary of the invention
Technical matters: this method discloses a kind of method, two kinds of functions that existing method can not possess have been realized, be respectively, one, when bearing has generalized displacement, during the centre-point load of bearing in structure and structure (environment) temperature variation, can reject generalized displacement of support, centre-point load variation and structure temperature and change the impact on Cable Structure health status recognition result, thereby identify exactly the health status of support cable; Two, this method is when identifying damaged cable, can also identify the variation of centre-point load simultaneously, be that this method can be rejected generalized displacement of support, structure temperature changes and the impact of support cable health status variation, realize the correct identification of centre-point load intensity of variation.
Technical scheme: this method is comprised of three parts.Respectively: one, " the temperature survey calculating method of the Cable Structure of this method "; Two, set up method, the structural health conditions appraisal procedure based on knowledge base (containing parameter) and the monitored amount of actual measurement of the required knowledge base of cable structure health monitoring system and parameter; Three, the software and hardware part of health monitoring systems.
In the method, with " bearing volume coordinate ", censure bearing about the coordinate of the X, Y, Z axis of Descartes's rectangular coordinate system, also can be said to is that bearing is about the volume coordinate of X, Y, Z axis, bearing is called bearing about the volume coordinate component of this axle about the concrete numerical value of the volume coordinate of some axles, in this method, also with a volume coordinate component of bearing, expresses bearing about the concrete numerical value of the volume coordinate of some axles; With " bearing angular coordinate ", censure bearing about the angular coordinate of X, Y, Z axis, bearing is called bearing about the angular coordinate component of this axle about the concrete numerical value of the angular coordinate of some axles, in this method, also with an angular coordinate component of bearing, expresses bearing about the concrete numerical value of the angular coordinate of some axles; All by " bearing generalized coordinate " denotion bearing angular coordinate and bearing volume coordinate, in this method, also with a generalized coordinate component of bearing, express bearing about the concrete numerical value of volume coordinate or the angular coordinate of an axle; Bearing is called support wire displacement about the change of the coordinate of X, Y, Z axis, also can say that the change of bearing volume coordinate is called support wire displacement, in this method, also with a translational component of bearing, expresses bearing about the concrete numerical value of the displacement of the lines of some axles; Bearing is called angular displacement of support about the change of the angular coordinate of X, Y, Z axis, in this method, also with an angular displacement component of bearing, expresses bearing about the concrete numerical value of the angular displacement of some axles; Generalized displacement of support denotion support wire displacement and angular displacement of support are all, in this method, also with a generalized displacement component of bearing, express bearing about the displacement of the lines of some axles or the concrete numerical value of angular displacement; Support wire displacement also can be described as translational displacement, and support settlement is that support wire displacement or translational displacement are at the component of gravity direction.
First confirm the quantity of the centre-point load that may change that Cable Structure is born.The feature of the centre-point load of bearing according to Cable Structure, confirm wherein " centre-point load likely changing ", or all centre-point load is considered as " centre-point load likely changing ", establishes total JZW the centre-point load that may change.
Centre-point load is divided into two kinds of concentrated force and concentrated couples, in coordinate system, for example, in Descartes's rectangular coordinate system, a concentrated force can resolve into three components, same, a concentrated couple also can resolve into three components, in the method a concentrated force component or a concentrated couple component is called to a centre-point load.
If the quantity sum of the quantity of the support cable of Cable Structure and JZW " centre-point load likely changing " is N.For sake of convenience, it is " evaluation object " that this method unitedly calls evaluated support cable and " centre-point load likely changing ", total N evaluation object.Give evaluation object serial number, this numbering will be for generating vector sum matrix in subsequent step.
" the whole monitored strain data of structure " can be described by the strain of a L assigned direction specified point and each specified point of K in structure, and the variation of structural strain data is exactly the variation of all strains of K specified point.Each total M(M=K * L) individual strain measurement value or calculated value characterize structural strain information.K and M generally must not be less than N.
Comprehensive above-mentioned monitored amount, total M the monitored amount of whole Cable Structure, M must not be less than the quantity N of evaluation object.
For simplicity, in the method by " monitored all parameters of Cable Structure " referred to as " monitored amount ".Give M monitored amount serial number, this numbering will be for generating vector sum matrix in subsequent step.This method is with representing this numbering with variable j, j=1, and 2,3 ..., M.
The first of this method: " the temperature survey calculating method of the Cable Structure of this method ".
First determine " the temperature survey calculating method of the Cable Structure of this method ".Because the temperature of Cable Structure may change, for example the temperature of the different parts of Cable Structure is to change along with the variation of intensity of sunshine, along with the variation of environment temperature changes, the surface of Cable Structure and inner temperature may be time dependent sometimes, the surface of Cable Structure may be different from inner temperature, the surface of Cable Structure and inner temperature difference are time dependent, the Mechanics Calculation of Cable Structure when this just makes to consider temperature conditions and monitoring very complex, for simplification problem, reduce calculated amount and reduce and measure cost, especially in order to improve computational accuracy, this method proposes " the temperature survey calculating method of the Cable Structure of this method ", specific as follows:
The first step, inquiry or actual measurement obtain the temperature variant thermal conduction study parameter of Cable Structure composition material and Cable Structure environment of living in, utilize the geometry measured data of design drawing, as-constructed drawing and the Cable Structure of Cable Structure, utilize these data and parameter to set up the thermal conduction study computation model of Cable Structure.Inquiry Cable Structure location is no less than the meteorological data in recent years of 2 years, statistics obtains interior during this period of time cloudy quantity and is designated as T cloudy day, statistics obtains 0 highest temperature and the lowest temperature between latter 30 minutes of the moment of sunrise next day at each cloudy day in T cloudy day, sunrise on the meteorology that sunrise refers to base area revolutions constantly and the rule that revolves round the sun is definite constantly, the sunrise that can inquire about data or calculate each required day by conventional meteorology constantly, each cloudy day 0 up to next day sunrise constantly the highest temperature between latter 30 minutes deduct the maximum temperature difference that the lowest temperature is called this cloudy daily temperature, there is T cloudy day, the maximum temperature difference that just has the daily temperature at T cloudy day, get maximal value in the maximum temperature difference of daily temperature at T cloudy day for reference to temperature difference per day, with reference to temperature difference per day, be designated as Δ T r.Between inquiry Cable Structure location and Altitude Region, place, be no less than temperature that the meteorological data in recent years of 2 years or actual measurement obtain Cable Structure environment of living in time with delta data and the Changing Pattern of sea level elevation, calculate the temperature of the Cable Structure environment of living in recent years that is no less than 2 years between Cable Structure location and Altitude Region, place about the maximum rate of change Δ T of sea level elevation h, for convenience of narration, get Δ T hunit be ℃/m.On the surface of Cable Structure, get " R Cable Structure surface point ", after will by actual measurement, obtain the temperature of this R Cable Structure surface point, claim that the temperature data that actual measurement obtains is " R Cable Structure surface temperature measured data ", if utilize the thermal conduction study computation model of Cable Structure, by Calculation of Heat Transfer, obtain the temperature of this R Cable Structure surface point, just claim that the temperature data calculating is " R Cable Structure surface temperature computational data ".While getting " R Cable Structure surface point " on the surface of Cable Structure, the quantity of " R Cable Structure surface point " is narrated in the back with the condition that distribution must be satisfied.From the residing minimum height above sea level of Cable Structure to the highest height above sea level, in Cable Structure, uniform choosing is no less than three different sea level elevations, the sea level elevation place choosing at each, at the intersection place on surface level and Cable Structure surface, at least choose two points, outer normal from selected point straw line body structure surface, all outer normal directions of choosing are called " measuring Cable Structure along the direction of the Temperature Distribution of wall thickness ", measure Cable Structure crossing with " intersection on surface level and Cable Structure surface " along the direction of the Temperature Distribution of wall thickness, in the measurement Cable Structure of choosing along comprising the sunny slope outer normal direction of Cable Structure and in the shade outer normal direction of Cable Structure in the direction of the Temperature Distribution of wall thickness, direction uniform choosing in Cable Structure along each measurement Cable Structure along the Temperature Distribution of wall thickness is no less than three points, measure all temperature that are selected a little, the temperature recording is called " Cable Structure is along the temperature profile data of thickness ", wherein along crossing with same " intersection on surface level and Cable Structure surface ", " measure Cable Structure along the direction of the Temperature Distribution of wall thickness " and measure " Cable Structure is along the temperature profile data of thickness " that obtain, be called in the method " identical sea level elevation Cable Structure is along the temperature profile data of thickness ", if chosen H different sea level elevation, at each sea level elevation place, choose B and measured Cable Structure along the direction of the Temperature Distribution of wall thickness, along each, measure Cable Structure and in Cable Structure, chosen E point along the direction of the Temperature Distribution of wall thickness, wherein H and E are not less than 3, B is not less than 2, if HBE is the product of H and B and E, corresponding total HBE " measuring Cable Structure along the point of the temperature profile data of thickness ", after will obtain the temperature that this HBE " measures Cable Structure along the point of the temperature profile data of thickness " by actual measurement, claim that the temperature data that actual measurement obtains is " HBE Cable Structure is along thickness temperature measured data ", if utilize the thermal conduction study computation model of Cable Structure, by Calculation of Heat Transfer, obtain this HBE and measure Cable Structure along the temperature of the point of the temperature profile data of thickness, just claim that the temperature data calculating is " HBE Cable Structure is along thickness temperature computation data ", if BE is the product of B and E, total BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " in sea level elevation place of choosing at each in this method.In Cable Structure location, according to meteorology, measure temperature and require to choose a position, will obtain meeting the temperature that meteorology is measured the Cable Structure place environment of temperature requirement in this position actual measurement, in the on-site spaciousness of Cable Structure, unobstructed place chooses a position, this position should can obtain in each day of the whole year this ground the most sufficient sunshine of getable this day, flat board at a carbon steel material of this position of sound production, be called reference plate, the one side of this reference plate on the sunny side, be called sunny slope, the sunny slope of reference plate is coarse and dark color, the sunny slope of reference plate should can obtain in each day of the whole year one flat plate on this ground the most sufficient sunshine of getable this day, the non-sunny slope of reference plate is covered with insulation material, Real-Time Monitoring is obtained to the temperature of the sunny slope of reference plate.In this method, to the time interval between any twice measurement of same amount Real-Time Monitoring, must not be greater than 30 minutes, the moment of survey record data is called physical record data constantly.
Second step, Real-Time Monitoring obtains R Cable Structure surface temperature measured data of above-mentioned R Cable Structure surface point, Real-Time Monitoring obtains previously defined Cable Structure along the temperature profile data of thickness simultaneously, and Real-Time Monitoring obtains meeting the temperature record that meteorology is measured the Cable Structure place environment of temperature requirement simultaneously, by Real-Time Monitoring, obtain being carved at sunrise the same day sunrise next day temperature measured data sequence of the Cable Structure place environment between latter 30 minutes constantly, the temperature measured data sequence of Cable Structure place environment is arranged according to time order and function order by the temperature measured data that was carved at sunrise the Cable Structure place environment between latter 30 minutes of the moment of sunrise next day the same day, find maximum temperature and minimum temperature in the temperature measured data sequence of Cable Structure place environment, by the maximum temperature in the temperature measured data sequence of Cable Structure place environment, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day that minimum temperature obtains Cable Structure place environment, be designated as Δ T emax, by the temperature measured data sequence of Cable Structure place environment, by conventional mathematical computations, obtain the temperature of Cable Structure place environment about the rate of change of time, this rate of change is also along with the time changes, by Real-Time Monitoring, obtain being carved at sunrise the same day sunrise next day measured data sequence of the temperature of the sunny slope of the reference plate between latter 30 minutes constantly, the measured data sequence of the temperature of the sunny slope of reference plate by be carved at sunrise the same day next day sunrise constantly the measured data of the temperature of the sunny slope of the reference plate between latter 30 minutes according to time order and function order, arrange, find maximum temperature and minimum temperature in the measured data sequence of temperature of sunny slope of reference plate, by the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day of temperature that minimum temperature obtains the sunny slope of reference plate, be designated as Δ T pmax, by Real-Time Monitoring, obtain being carved at sunrise the same day sunrise next day Cable Structure surface temperature measured data sequence of all R Cable Structure surface points between latter 30 minutes constantly, there is R Cable Structure surface point just to have R Cable Structure surface temperature measured data sequence, each Cable Structure surface temperature measured data sequence by be carved at sunrise on same day of a Cable Structure surface point sunrise next day constantly the Cable Structure surface temperature measured data between latter 30 minutes according to time order and function order, arrange, find maximum temperature and minimum temperature in each Cable Structure surface temperature measured data sequence, by the maximum temperature in each Cable Structure surface temperature measured data sequence, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day that minimum temperature obtains the temperature of each Cable Structure surface point, there is R Cable Structure surface point just to have and be carved at sunrise the sunrise next day maximum temperature difference numerical value between latter 30 minutes constantly R the same day, maximal value is wherein designated as Δ T smax, by each Cable Structure surface temperature measured data sequence, by conventional mathematical computations, obtain the temperature of each Cable Structure surface point about the rate of change of time, the temperature of each Cable Structure surface point about the rate of change of time also along with the time changes.By Real-Time Monitoring, obtain being carved at sunrise the same day between latter 30 minutes of the moment of sunrise next day, at synchronization, after HBE " Cable Structure is along the temperature profile data of thickness ", the sea level elevation place that calculating is chosen at each amounts to maximum temperature in BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " and the difference of minimum temperature, the absolute value of this difference is called " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", chosen H different sea level elevation and just had H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", claim that the maximal value in this H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference " is " Cable Structure thickness direction maximum temperature difference ", be designated as Δ T tmax.
The 3rd step, measures and calculates acquisition Cable Structure steady temperature data, first, determine the moment that obtains Cable Structure steady temperature data, the condition relevant to the moment that determines acquisition Cable Structure steady temperature data has six, first condition is the moment that obtains Cable Structure steady temperature data to be carved at sunset sunrise next day constantly between latter 30 minutes between the same day, sunset refers to sunset on base area revolutions and the definite meteorology of revolution rule constantly constantly, and the sunset that can inquire about data or calculate each required day by conventional meteorology constantly, the a condition of second condition be the same day be carved at sunrise next day sunrise constantly between latter 30 minutes during this period of time in, reference plate maximum temperature difference Δ T pmaxwith Cable Structure surface maximum temperature difference Δ T smaxall be not more than 5 degrees Celsius, the b condition of second condition be the same day be carved at sunrise next day sunrise constantly between latter 30 minutes during this period of time in, above, measure the environment maximum error Δ T calculating emaxbe not more than with reference to temperature difference per day Δ Tr, and reference plate maximum temperature difference Δ T pmaxafter deducting 2 degrees Celsius, be not more than Δ T emax, and Cable Structure surface maximum temperature difference Δ T smaxbe not more than Δ T pmax, only needing to meet in a condition of second and b condition one is just called and meets second condition, the 3rd condition is that the temperature of Cable Structure place environment is not more than 0.1 degree Celsius per hour about the absolute value of the rate of change of time in the moment that obtains Cable Structure steady temperature data, the 4th condition is that the temperature of each the Cable Structure surface point in R Cable Structure surface point is not more than 0.1 degree Celsius per hour about the absolute value of the rate of change of time in the moment that obtains Cable Structure steady temperature data, the 5th condition is in the moment that obtains Cable Structure steady temperature data, and the Cable Structure surface temperature measured data of each the Cable Structure surface point in R Cable Structure surface point is to be carved at sunrise the sunrise next day minimal value between latter 30 minutes constantly the same day, the 6th condition is at the moment that obtains Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T tmaxbe not more than 1 degree Celsius, this method is utilized above-mentioned six conditions, any one in following three kinds of moment is called to " obtaining the mathematics of Cable Structure steady temperature data constantly ", the first is first moment to the 5th condition meeting in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, the second is the moment that only meets the 6th condition in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, the third is first moment to the 6th condition simultaneously meeting in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, when obtaining the mathematics of Cable Structure steady temperature data, be exactly in this method during in constantly one of physical record data constantly, the moment that obtains Cable Structure steady temperature data be exactly obtain Cable Structure steady temperature data mathematics constantly, if obtain the mathematics of Cable Structure steady temperature data and be not constantly any in constantly of physical record data in this method constantly, get this method close to moment of the mathematics that obtains Cable Structure steady temperature data those physical record data constantly for obtaining the moment of Cable Structure steady temperature data, this method is carried out the relevant health monitoring analysis of Cable Structure by using in the amount that obtains the moment survey record of Cable Structure steady temperature data, this method is approximate thinks that the Cable Structure temperature field in moment of obtaining Cable Structure steady temperature data is in stable state, i.e. this Cable Structure temperature constantly temporal evolution not, and this is exactly " obtaining the moment of Cable Structure steady temperature data " of this method constantly, then, according to Cable Structure heat transfer characteristic, utilize " R the Cable Structure surface temperature measured data " and " HBE Cable Structure is along thickness temperature measured data " in the moment that obtains Cable Structure steady temperature data, utilize the thermal conduction study computation model of Cable Structure, by conventional Calculation of Heat Transfer, obtain in the Temperature Distribution of Cable Structure that obtains the moment of Cable Structure steady temperature data, now calculate by stable state in the temperature field of Cable Structure, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculating comprises the accounting temperature of R Cable Structure surface point in Cable Structure, the accounting temperature of R Cable Structure surface point is called R Cable Structure stable state surface temperature computational data, also comprise that Cable Structure is in the accounting temperature of selected HBE " measuring Cable Structure along the point of the temperature profile data of thickness " above, the accounting temperature of HBE " measuring Cable Structure along the point of the temperature profile data of thickness " is called " HBE Cable Structure is along thickness temperature computation data ", when R Cable Structure surface temperature measured data and R Cable Structure stable state surface temperature computational data correspondent equal, and when " HBE Cable Structure is along thickness temperature measured data " and " HBE Cable Structure is along thickness temperature computation data " correspondent equal, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculating is called " Cable Structure steady temperature data " in the method, " R Cable Structure surface temperature measured data " is now called " R Cable Structure stable state surface temperature measured data ", " HBE Cable Structure is along thickness temperature measured data " is called " HBE Cable Structure is along thickness steady temperature measured data ", while getting " R Cable Structure surface point " on the surface of Cable Structure, the quantity of " R Cable Structure surface point " and necessary three conditions that meet that distribute, first condition is when Cable Structure temperature field is during in stable state, on Cable Structure surface the temperature of any point be by " R Cable Structure surface point " with Cable Structure surface on the observed temperature linear interpolation of the adjacent point in this arbitrfary point while obtaining, on the Cable Structure surface that linear interpolation obtains, on the temperature of this arbitrfary point and Cable Structure surface, the error of the actual temperature of this arbitrfary point is not more than 5%, Cable Structure surface comprises support cable surface, second condition is that in " R Cable Structure surface point ", the quantity at the point of same sea level elevation is not less than 4, and uniform along Cable Structure surface at the point of same sea level elevation in " R Cable Structure surface point ", " R Cable Structure surface point " is not more than 0.2 ℃ divided by Δ T along the maximal value Δ h in the absolute value of all differences of the sea level elevation of adjacent Cable Structure surface point between two of sea level elevation hthe numerical value obtaining, gets Δ T for convenience of narration hunit be ℃/m that the unit of getting Δ h for convenience of narration is m, " R Cable Structure surface point " refers to while only considering sea level elevation along the definition of adjacent Cable Structure surface point between two of sea level elevation, in " R Cable Structure surface point ", do not have a Cable Structure surface point, the sea level elevation numerical value of this Cable Structure surface point is between the sea level elevation numerical value of adjacent Cable Structure surface point between two, the 3rd condition is inquiry or obtains the rule at sunshine between Cable Structure location and Altitude Region, place by meteorology conventionally calculation, again according to the geometric properties of Cable Structure and bearing data, in Cable Structure, find and be subject to the sunshine-duration position of those surface points the most fully the whole year, in " R Cable Structure surface point ", having a Cable Structure surface point at least is the annual point being subject in the most sufficient those surface points of sunshine-duration in Cable Structure.
The second portion of this method: method, the structural health conditions appraisal procedure based on knowledge base (containing parameter) and the monitored amount of actual measurement of setting up the required knowledge base of cable structure health monitoring system and parameter.Can carry out successively as follows, to obtain the health status assessment of evaluation object more accurately.
The first step: set up initial mechanical calculating benchmark model A oin Cable Structure completion, or before setting up health monitoring systems, according to " the temperature survey calculating method of the Cable Structure of this method " measurement, calculating " Cable Structure steady temperature data " (can measure by conventional thermometry, for example use thermal resistance to measure), " Cable Structure steady temperature data " now use vector T orepresent, be called initial Cable Structure steady temperature data vector T o.In actual measurement, obtain T otime, namely obtaining initial Cable Structure steady temperature data vector T othe synchronization in the moment, use conventional method directly to measure the initial number of all monitored amounts that calculate Cable Structure.At Actual measurement, obtain initial Cable Structure steady temperature data vector T otime, use conventional method (consult reference materials or survey) to obtain temperature variant physical parameter (for example thermal expansivity) and the mechanical property parameters (for example elastic modulus, Poisson ratio) of the various materials that Cable Structure used; At Actual measurement, obtain initial Cable Structure steady temperature data vector T otime, namely obtaining initial Cable Structure steady temperature data vector T othe synchronization in the moment, use conventional method Actual measurement to obtain the Actual measurement data of Cable Structure.First the Actual measurement data of Cable Structure are the data of the health status that can express rope that comprise the Non-destructive Testing Data of support cable, and the Actual measurement data of Cable Structure still comprise the measured data of the initial geometric data of Cable Structure, rope force data, draw-bar pull data, initial Cable Structure bearing generalized coordinate data (comprising initial Cable Structure bearing spatial data and initial Cable Structure bearing angular data), Cable Structure modal data, structural strain data, structure angle measurement data, structure space measurement of coordinates data, load data.The initial geometric data of Cable Structure can be the spatial data that the spatial data of the end points of all ropes adds a series of point in structure, and object is to determine according to these coordinate datas the geometric properties of Cable Structure.For cable-stayed bridge, the spatial data that initial geometric data can be the end points of all ropes adds the spatial data of some points on bridge two ends, so-called bridge type data that Here it is.The variable quantity of " centre-point load likely changing " is being set up initial mechanical calculating benchmark model A otime be all 0, the variable quantity that is to say " centre-point load likely changing " that identifies is below with respect to setting up initial mechanical calculating benchmark model A otime the structure corresponding centre-point load of bearing variable quantity.The data of health status and the variable quantity data of " centre-point load likely changing " of utilizing the Non-destructive Testing Data etc. of support cable can express support cable are set up evaluation object initial damage vector d o(as the formula (1)), use d orepresent that Cable Structure is (with initial mechanical calculating benchmark model A othe initial health of evaluation object expression).If while there is no the Non-destructive Testing Data of support cable and the data of other health status that can express support cable, or can think that structure original state is not damaged during without relaxed state, vectorial d oin each element numerical value relevant to support cable get 0.Vector d oin each element numerical value relevant to the variable quantity of centre-point load get 0.Utilize the design drawing, as-constructed drawing of Cable Structure and the initial measured data of Cable Structure, temperature variant physical and mechanical properties parameter and the initial Cable Structure steady temperature data vector T of the various materials that the Non-destructive Testing Data of support cable, Cable Structure are used o, utilize mechanics method (for example finite element method) to count " Cable Structure steady temperature data " and set up initial mechanical calculating benchmark model A o.
Corresponding to A ocable Structure bearing generalized coordinate data form initial Cable Structure bearing generalized coordinate vector U o.
d o=[d o1?d o2?···?d ok?···?d oN] T???(1)
D in formula (1) ok(k=1,2,3 ...., N) represent initial mechanical calculating benchmark model A oin the original state of k evaluation object, if this evaluation object is the rope (or pull bar) in cable system, so d okrepresent its initial damage, d okbe to represent not damaged at 0 o'clock, while being 100%, represent that this rope thoroughly loses load-bearing capacity, in the time of between 0 and 100%, represent to lose the load-bearing capacity of corresponding proportion; If this evaluation object is " centre-point load that may change ", so a d okrepresent its initial value, d okbe 0, the variable quantity that is to say " centre-point load likely changing " that identifies is below with respect to setting up initial mechanical calculating benchmark model A otime the structure corresponding centre-point load of bearing variable quantity.In formula, subscript T represents vectorial transposition (same afterwards).
In actual measurement, obtain T otime, namely at the synchronization that obtains the moment of Cable Structure steady temperature data, use conventional method directly to measure the initial value of all monitored amounts of the Cable Structure calculating, form monitored amount initial value vector C o(seeing formula (2)).Requirement is obtaining A otime obtain C o, monitored amount initial value vector C oexpression is corresponding to A othe concrete numerical value of " monitored amount ".Because of subject to the foregoing, the calculating benchmark model based on Cable Structure calculates the monitored amount of gained reliably close to the measured data of initial monitored amount, in narration below, will represent this calculated value and measured value with prosign.
C o=[C o1?C o2?···?C oj?···?C oM] T???(2)
C in formula (2) oj(j=1,2,3 ...., M) be the original bulk of j monitored amount in Cable Structure, this component according to coding rule corresponding to specific j monitored amount.Vector C obe to arrange and form according to a definite sequence by the monitored amount of M, this put in order and there is no specific (special) requirements, only require below also array data in this order of all associated vector.
No matter which kind of method to obtain initial mechanical calculating benchmark model A by o, counting " Cable Structure steady temperature data " (is initial Cable Structure steady temperature data vector T o), based on A othe Cable Structure computational data calculating must approach its measured data very much, and error generally must not be greater than 5%.Like this can utility A ocalculate Suo Li computational data, strain computational data, Cable Structure shape computational data and displacement computational data under the analog case of gained, Cable Structure angle-data, Cable Structure spatial data etc., the measured data when approaching reliably institute's analog case and truly occurring.Model A oevaluation object initial damage vector d for the health status of middle evaluation object orepresent model A othe vectorial U of middle bearing generalized coordinate orepresent initial Cable Structure steady temperature data vector T for Cable Structure steady temperature data orepresent.Due to based on A othe evaluation that calculates all monitored amounts approaches the initial value (actual measurement obtains) of all monitored amounts very much, so also can be used in A obasis on, carry out Mechanics Calculation obtains, A othe evaluation of each monitored amount form monitored amount initial value vector C o.U o, T oand d oa oparameter, also can say C oby A omechanics Calculation result form.
Second step: circulation starts.When circulation starts each time, the current initial damage vector of the evaluation object d while first needing to set up or set up this circulation beginning i o(i=1,2,3 ...), set up the current initial mechanical calculating benchmark model A of Cable Structure i o(finite element benchmark model for example, A in circulation each time i oconstantly update), A i o" current initial Cable Structure steady temperature data vector T for Temperature Distribution i o" express.Letter i, except representing that significantly, the place of number of steps, alphabetical i only represents cycle index in the method, circulates for the i time.A oand A i ocount temperature parameter, can accounting temperature change the Effect on Mechanical Properties to Cable Structure.
The current initial damage vector of evaluation object that the i time circulation needs while starting is designated as d i o(as the formula (3)), use d i owhile representing this circulation beginning, Cable Structure is (with current initial mechanical calculating benchmark model A i othe health status of evaluation object expression).
d o i = d o 1 i d o 2 i · · · d ok i · · · d oN i T - - - ( 3 )
D in formula (3) i ok(i=1,2,3, K=1,2,3 ...., while N) representing that the i time circulation starts, current initial mechanical calculating benchmark model A i oin the original state of k evaluation object, if this evaluation object is the rope (or pull bar) in cable system, so d i okrepresent its initial damage, d i okbe to represent not damaged at 0 o'clock, while being 100%, represent that this rope thoroughly loses load-bearing capacity, in the time of between 0 and 100%, represent to lose the load-bearing capacity of corresponding proportion, if this evaluation object is " centre-point load that may change ", so a d i okrepresent that it is with respect to setting up initial mechanical calculating benchmark model A otime the structure corresponding centre-point load of bearing variable quantity.
Current initial mechanical calculating benchmark model A corresponding to Cable Structure i ocable Structure bearing generalized coordinate data form current initial Cable Structure bearing generalized coordinate vector U i o, at initial time, namely set up for the first time the current initial mechanical calculating benchmark model A of Cable Structure i otime, U i ojust equal U o.
Set up and renewal d i omethod as follows:
When circulation starts for the first time, set up the current initial damage vector of evaluation object and (according to formula (3), be designated as d 1 o) time, d 1 ojust equal d o.I (i=2,3,4,5,6 ...) the current initial damage vector of the evaluation object d that needs while starting of inferior circulation i o, be front once (the i-1 time, i=2,3,4,5,6 ...) circulation finishes that front calculating obtains, concrete grammar is described below.
I (i=1,2,3,4,5,6 ...) the Mechanics Calculation benchmark model of the Mechanics Calculation benchmark model that inferior circulation need to be set up while starting or the Cable Structure of having set up is designated as current initial mechanical calculating benchmark model A i o.Corresponding to A i o" Cable Structure steady temperature data " use vector T i orepresent, be called current initial Cable Structure steady temperature data vector T i o.Vector T i odefinition mode and vector T odefinition mode identical, when circulation starts each time, must set up or set up current initial Cable Structure steady temperature data vector T i o.
Set up, upgrade A i o, U i oand T i omethod as follows:
The Mechanics Calculation benchmark model of the Cable Structure of setting up when circulation starts is for the first time designated as A 1 o, A 1 oequal A o, T 1 oequal T o.A in circulation each time i o, U i oand T i oconstantly update, concrete grammar is described below; When circulation end each time, upgrade A i o, U i oand T i othe Mechanics Calculation benchmark model of required Cable Structure while obtaining next time circulating beginning, concrete grammar is described below.
" the current initial value vector of monitored amount C for this method i o" (i=1,2,3 ...) represent the initial value (referring to formula (4)) of the monitored amount of all appointments when the i time (i=1,2,3,4,5,6 ...) circulation starts, C i oalso can be called " the i time current initial value of the monitored amount of circulation vector ".
C o i = C o 1 i C o 2 i · · · C oj i · · · C oM i T - - - ( 4 )
C in formula (2) i oj(i=1,2,3, J=1,2,3 ...., j monitored amount while M) being the i time circulation beginning, in Cable Structure.Vector C i obe to arrange and form according to a definite sequence by the monitored amount of previously defined M, this put in order and there is no specific (special) requirements, only require below also array data in this order of all associated vector.
Setting up model A i otime set up " the current initial value vector of monitored amount C i o", the current initial value vector of monitored amount C i oexpression is corresponding to A i othe concrete numerical value of all monitored amounts, C i oelement and C oelement corresponding one by one, represent respectively all monitored amounts in Cable Structure in A i oand A oconcrete numerical value during two states.
Set up and renewal C i oconcrete grammar as follows:
When circulation starts for the first time, C 1 o(i=1, C i obe embodied as C 1 o) equal C o; I (i=2,3,4,5,6 ...) the i time circulation " vectorial C of the current initial value of monitored amount of needing while starting of inferior circulation i o", be front once (the i-1 time, i=2,3,4,5,6 ...) circulation finishes that front calculating obtains, concrete grammar is described below.The i time (i=1,2,3,4,5,6 ...) in circulation, " the current initial value vector of monitored amount C i o" constantly update, concrete grammar is described below.Due to according to model A i ocalculate the initial value of the monitored amount of gained reliably close to corresponding measured value, in narration below, will represent this calculated value composition of vector and measured value composition of vector with prosign.
T i o, U i oand d i oa i ocharacterisitic parameter, C i oa i omechanics Calculation result form.
The 3rd step: in Cable Structure military service process, in circulation each time, in other words in i (i=1,2,3,4,5,6 ...) in inferior circulation, at known A i o, T i o, U i o, C i oand d i oafter, the current data that obtains " Cable Structure steady temperature data " according to " the temperature survey calculating method of the Cable Structure of this method " continuous Actual measurement, the current data of all " Cable Structure steady temperature data " forms " current cable structure steady temperature data vector T i", vector T idefinition mode and vector T odefinition mode identical; In actual measurement vector T itime, namely obtaining current cable structure steady temperature data vector T ithe synchronization in the moment, actual measurement obtains the currency of all monitored amounts in Cable Structure, all these numerical value form monitored amount current value vector C i.C ielement and C oelement corresponding one by one, represent that identical monitored amount is at numerical value in the same time not.Obtaining vector T itime, actual measurement obtains Cable Structure bearing generalized coordinate current data, and all Cable Structure bearing generalized coordinate current datas form current cable structure actual measurement bearing generalized coordinate vector U i.
Obtaining vector T iafter, according to following concrete grammar, upgrade A i o, T i o, U i o, C i oand d i o:
Compare respectively T iand T i o, U iand U i oif, T iequal T i oand U iequal U i o, do not need A i oupgrade, otherwise need to be to A i o, U i oand T i oupgrade, update method is: the first step is calculated U iwith U opoor, U iwith U odifference be exactly that Cable Structure bearing is about the generalized displacement of support of initial position, with generalized displacement of support vector, V represents generalized displacement of support, between element in generalized displacement of support vector V and generalized displacement of support component, it is one-to-one relationship, in generalized displacement of support vector V, the numerical value of an element is corresponding to the generalized displacement of an assigned direction of an appointment bearing, and wherein generalized displacement of support is exactly support settlement amount at the component of gravity direction; Second step calculates T iwith T opoor, T iwith T odifference be exactly that current cable structure steady temperature data are about the variation of initial Cable Structure steady temperature data, T iwith T opoor with steady temperature change vector S, represent, S equals T ideduct T o, S represents the variation of Cable Structure steady temperature data; The 3rd step is first to A oin Cable Structure bearing apply generalized displacement of support constraint, the numerical value of generalized displacement of support constraint is just taken from the numerical value of corresponding element in generalized displacement of support vector V, then to A oin Cable Structure apply temperature variation, the numerical value of the temperature variation applying is just taken from steady temperature change vector S, to A omiddle Cable Structure bearing applies generalized displacement of support constraint and to A oin Cable Structure apply and obtain the current initial mechanical calculating benchmark model A that upgrades after temperature variation i o, upgrade A i otime, U i oall elements numerical value is also used U iall elements numerical value is corresponding to be replaced, and has upgraded U i o, T i oall elements numerical value is also used T icorresponding replacement of all elements numerical value, upgraded T i o, so just obtained correctly corresponding to A i ou i oand T i o; D now i oremain unchanged.When upgrading A i oafter, A i othe current initial damage of the cable system vector d for health status of rope i orepresent A i ocurrent cable structure steady temperature data vector T for Cable Structure steady temperature irepresent A i ocurrent initial Cable Structure bearing generalized coordinate vector U for bearing generalized coordinate i orepresent, by Mechanics Calculation, obtain A i oin concrete numerical value all monitored amounts, current, with these concrete numerical value, replace C i othe element of middle correspondence, has so just realized the current initial value vector of monitored amount C i orenewal.
The 4th step: circulation time must first be set up " unit damage monitored numerical quantity transformation matrices " and " evaluation object unit change vector " each time, and " unit damage monitored numerical quantity transformation matrices " that the i time circulation set up is designated as Δ C i(i=1,2,3 ...)." evaluation object unit change vector " that the i time circulation set up is designated as D i u.Δ C in circulation each time iand D i uneed to according to circumstances constantly update, upgrade current initial mechanical calculating benchmark model A i o, current initial Cable Structure steady temperature data vector T i owith the current initial value vector of monitored amount C i oafter, upgrade unit damage monitored numerical quantity transformation matrices Δ C iwith evaluation object unit change vector D i u.
When circulation starts each time, first set up in the steps below unit damage monitored numerical quantity transformation matrices Δ C iwith evaluation object unit change vector D i u; If upgraded A in the 3rd step i o, in this step, must re-establish so (upgrading) unit damage monitored numerical quantity transformation matrices Δ C iwith evaluation object unit change vector D i u; If do not upgrade A in the 3rd step i o, in this step, needn't re-establish so unit damage monitored numerical quantity transformation matrices Δ C iwith evaluation object unit change vector D i u; Set up and re-establish (upgrading) Δ C iand D i udetailed process identical, be listed as follows:
Current initial mechanical calculating benchmark model A in Cable Structure i obasis on carry out several times calculating, on calculation times numerical value, equal the quantity of all ropes.Calculating each time hypothesis only has an evaluation object (original centre-point load variable quantity can be 0 at original damage or centre-point load variable quantity, also can not be 0) basis on increase again unit damage or centre-point load unit change, concrete, if this evaluation object is a support cable in cable system, so just suppose that this support cable increases unit damage (for example getting 5%, 10%, 20% or 30% equivalent damage is unit damage) again, if this evaluation object is a centre-point load, just suppose that this centre-point load is at vectorial d i o(if this centre-point load is couple, centre-point load unit change can be got 1kNm, 2kNm, 3kNm etc. for unit change on the basis of the existing variable quantity of this centre-point load representing, to increase centre-point load unit change again; If this centre-point load is concentrated force, centre-point load unit change can be got 1kN, 2kN, 3kN etc. for unit change).For convenience of calculating, while set increasing unit damage or centre-point load unit change in circulation each time, can be all structural health conditions when this circulation started as being completely healthy, and set on this basis unit damage or centre-point load unit change (in subsequent step, damage numerical value that calculate, evaluation object or centre-point load variable quantity---be called name damage d i c(i=1,2,3 ...), all when this circulation started, by the health status of evaluation object as being completely healthy speech, the formula therefore must foundation hereinafter providing damages the name calculating to be converted into true damage).The evaluation object that occurs unit damage or centre-point load unit change in calculating each time with once circulation is different from the evaluation object that occurs unit damage or centre-point load unit change in other calculating, and suppose each time the unit damage value of the evaluation object that has unit damage or centre-point load unit change or unit damage value or the centre-point load unit change numerical value that centre-point load unit change numerical value can be different from other evaluation objects, with " evaluation object unit change vector D i u" (as the formula (5)) record unit damage or the centre-point load unit change of supposition of all evaluation objects in each circulation, circulation time is designated as D for the first time 1 ucalculate each time all utilize mechanics method (for example finite element method) calculate Cable Structure, at the current calculated value of the M of appointment monitored amount above, the current calculated value that calculates each time gained M monitored amount forms one " monitored amount calculation current vector ", and (when k evaluation object of hypothesis has unit damage, available formula (6) represents the monitored amount calculation current vector C of M monitored amount of all appointments i tk); The monitored amount calculation current vector calculating each time deducts the current initial value vector of monitored amount C i o, gained vector is exactly that " the numerical value change vector of monitored amount " of (take the position of the rope that has unit damage or numbering etc. are mark) (when k evaluation object has unit damage, used δ C under this condition i kthe numerical value change vector that represents monitored amount, δ C i kdefinition see formula (7), formula (8) and formula (9), formula (7) deducts after formula (4) again divided by vectorial D for formula (6) i uk element D i ukgained), the numerical value change of monitored amount vector δ C i kthe supposition owing to calculating of each element representation have the unit damage of that evaluation object (for example k evaluation object) of unit damage or centre-point load unit change or centre-point load unit change (D for example i uk), and the numerical value change amount of the corresponding monitored amount of this element causing is with respect to unit damage or the centre-point load unit change numerical value D of supposition i ukrate of change; There is N evaluation object just to have N " the numerical value change vector of monitored amount ", the numerical value change vector of each monitored amount has M element, by this N " the numerical value change vector of monitored amount ", forms successively " the unit damage monitored numerical quantity transformation matrices Δ C that has M * N element i" (the capable N row of M), each vectorial δ C i k(k=1,2,3 ...., N) be matrix Δ C irow, Δ C idefinition as the formula (10).
D u i = D u 1 i D u 2 i · · · D uk i · · · D uN i T - - - ( 5 )
Evaluation object unit change vector D in formula (5) i uelement D i uk(i=1,2,3, K=1,2,3 ...., N) represent unit damage or the centre-point load unit change numerical value of k evaluation object of supposition in the i time circulation, vectorial D i uin the numerical value of each element can be the same or different.
C yk i = C tk 1 i C tk 2 i · · · C tkj i · · · C tkM i T - - - ( 6 )
Elements C in formula (6) i tkj(i=1,2,3, K=1,2,3 ...., N; J=1,2,3 ...., M) represent that the i time circulation is while having unit damage or centre-point load unit change due to k evaluation object, according to the calculating current value of the monitored amount of corresponding j the appointment of coding rule.
δ C k i = C tk i - C o i D uk i - - - ( 7 )
The subscript i(i=1 of each amount in formula (7), 2,3 ...) represent the i time circulation, subscript k(k=1,2,3 ...., N) represent unit damage or the centre-point load unit change that k evaluation object increases, D in formula i ukvectorial D i uin k element.Vector δ C i kdefinition suc as formula shown in (7) and formula (8), δ C i kj(j=1,2,3 ...., M) individual element δ C i kj(definition as the formula (9)) represents, in the i time circulation, to set up matrix Δ C itime, suppose and when k evaluation object has unit damage or centre-point load unit change, calculate the change amount of gained j monitored amount with respect to unit damage or the centre-point load unit change D of supposition i ukrate of change.
δC k i = δC k 1 i δC k 2 i · · · δC kj i · · · δC kM i T - - - ( 8 )
δ C kj i = C tkj i - C oj i D uk i - - - ( 9 )
ΔC i = δC 1 i δC 2 i · · · δC k i · · · δC N i - - - ( 10 )
Vectorial δ C in formula (10) i k(i=1,2,3 ....,, k=1,2,3 ...., N) represent in the i time circulation, because k evaluation object increases unit damage or centre-point load unit change D i ukcause, the relative value of all monitored amounts changes.Matrix Δ C ithe coding rule and vectorial d above of row (subscript k) i othe coding rule of subscript k of element identical.
The 5th step: the current health status of identification Cable Structure.Detailed process is as follows.
I(i=1,2,3 ...) in inferior circulation, utilize " the monitored amount current value vector C obtaining in second step actual measurement i" " the current initial value of monitored amount vector C together i o", " unit damage monitored numerical quantity transformation matrices Δ C i" and " the vectorial d of current name damage i c" between linear approximate relationship, shown in (11) or formula (12).
C i = C o i + Δ C i · d c i - - - ( 11 )
C i - C o i = Δ C i · d c i - - - ( 12 )
Monitored amount current value vector C in formula (11) and formula (12) idefinition be similar to the current initial value of monitored amount vector C i odefinition, see formula (13); The vectorial d of the current name damage of evaluation object i cdefinition see formula (14).
C i = C 1 i C 2 i · · · C j i · · · C M i T - - - ( 13 )
Elements C in formula (13) i j(i=1,2,3 ....; J=1,2,3 ...., M) be the i time circulation time Cable Structure, according to the current value of the monitored amount of the corresponding j of being numbered of coding rule.
d c i = d c 1 i d c 2 i · · · d ck i · · · d cN i T - - - ( 14 )
D in formula (14) i ck(i=1,2,3 ....; K=1,2,3 ...., N) be current name damage or the current nominal centre-point load changing value of k evaluation object in the i time circulation, vectorial d i ccoding rule and the matrix Δ C of subscript k of element ithe coding rule of row identical.
When support cable actual damage is not too large, because Cable Structure material is still in the linear elasticity stage, the distortion of Cable Structure is also less, and the represented a kind of like this linear relationship of formula (11) or formula (12) is less with the error of actual conditions, and error can be used error vector e i(formula (15)) definition, the error of linear relationship shown in expression (11) or formula (12).
e i = abs ( Δ C i · d c i - C i + C o i ) - - - ( 15 )
In formula (15), abs () is the function that takes absolute value, and each vectorial element of trying to achieve in bracket is taken absolute value.
Owing to there is certain error in formula (11) or the represented linear relationship of formula (12), therefore can not be simply according to formula (11) or formula (12) and " the vectorial C of monitored amount current value i" come direct solution to obtain the vectorial d of the current name damage of evaluation object i c.If done like this, the vectorial di of the current name damage of evaluation object obtaining cin element even there will be larger negative value, namely negative damage, this is obviously irrational.Therefore obtain the vectorial d of the current name damage of evaluation object i cacceptable solution (with reasonable error, but can be more exactly from cable system, determine damaged cable position and degree of injury thereof, also can determine more exactly centre-point load variation numerical value) become a rational solution, available formula (16) is expressed this method.
abs ( Δ C i · d c i - C i + C o i ) ≤ g i - - - ( 16 )
In formula (16), abs () is the function that takes absolute value, vectorial g idescription departs from the legitimate skew of ideal linearity relation (formula (11) or formula (12)), by formula (17), is defined.
g i = g 1 i g 2 i · · · g j i · · · g M i T - - - ( 17 )
In formula (17) g i j ( i = 1,2,3 , . . . . . . . ; j = 1,2,3 , . . . . . . . , M ) The maximum allowable offset that departs from the ideal linearity relation shown in formula (11) or formula (12) in the i time circulation has been described.Vector g ican be according to the error vector e of formula (15) definition itentative calculation is selected.
At the current initial value vector of monitored amount C i o, unit damage monitored numerical quantity transformation matrices Δ C iwith monitored amount current value vector C iwhen known, can utilize suitable algorithm (for example multi-objective optimization algorithm) to solve formula (16), obtain the vectorial d of the current name damage of evaluation object i cacceptable solution, the current actual damage of evaluation object vector d ithe element of (formula (18) is shown in definition) can calculate according to formula (19), thereby can be by d idetermine the health status of evaluation object.
d i = d 1 i d 2 i · · · d k i · · · d N i T - - - ( 18 )
D in formula (18) i k(i=1,2,3, K=1,2,3 ...., N) representing the current actual health status of k evaluation object in the i time circulation, formula (19) is shown in its definition, if this evaluation object is the support cable (or pull bar) in cable system, so d i krepresent its current actual damage, d i kbe to represent not damaged at 0 o'clock, while being 100%, represent that this support cable thoroughly loses load-bearing capacity, in the time of between 0 and 100%, represent to lose the load-bearing capacity of corresponding proportion; If this evaluation object is centre-point load, so a d i kthe current actual change numerical value that represents the centre-point load that it is corresponding, vectorial d ithe coding rule of element and formula (1) in vectorial d othe coding rule of element identical.
D in formula (19) i ok(i=1,2,3,4, K=1,2,3 ...., N) be the current initial damage vector of evaluation object d i ok element, d i ckthe vectorial d of the current name damage of evaluation object i ck element.
In a word, when bearing has generalized displacement, this method has realized two kinds of functions that existing method can not possess, be respectively, during the centre-point load of one, bearing in structure and structure (environment) temperature variation, can reject generalized displacement of support, centre-point load variation and structure temperature and change the impact on Cable Structure health status recognition result, thereby identify exactly the structure health monitoring method of damaged cable; Two, this method is when identifying damaged cable, can also identify the variation of centre-point load simultaneously, be that this method can be rejected generalized displacement of support, structure temperature changes and the impact of support cable health status variation, realize the correct identification of centre-point load intensity of variation.
The 6th step: judge whether to finish this (the i time) circulation, if so, complete this circulation and finish front tailing in work, for next time (the i+1 time, i=1,2,3,4 ...) circulation preparation Mechanics Calculation benchmark model and necessary vector.Detailed process is as follows:
In this (the i time) circulation, try to achieve the vectorial d of current name damage i cafter, first, according to formula (20), set up mark vector B i, formula (21) has provided mark vector B ithe definition of k element; If mark vector B ielement be 0 entirely, get back to the 3rd step and proceed the health monitoring of Cable Structure and calculating; If mark vector B ielement be not 0 entirely, complete after subsequent step, enter next time circulation.
So-called subsequent step is: first, according to formula (22) calculate next time (the i+1 time, i=1,2,3,4 ...) circulate initial damage vector d required i+1 oeach element d i+1 ok; The second, at Mechanics Calculation benchmark model A obasis on, make A oin the health status of evaluation object be d i+1 orather than be d oafter, more further to A oin Cable Structure apply temperature variation (as previously mentioned, the numerical value of the temperature variation applying just taken from steady temperature change vector S, and steady temperature change vector S equals T ideduct T o), so just obtained next time (the i+1 time, i=1,2,3,4 ...) required current initial mechanical calculating benchmark mould A circulates i+1 o, next time (the i+1 time, i=1,2,3,4 ...) required current initial Cable Structure steady temperature data vector T circulates i+1 oequal T i o, more further to A oin Cable Structure apply generalized displacement of support constraint (as previously mentioned, the numerical value of the generalized displacement of support constraint applying just taken from generalized displacement of support vector V, and generalized displacement of support vector V equals U ideduct U o), so just obtained next time (the i+1 time, i=1,2,3,4 ...) required current initial mechanical calculating benchmark mould A circulates i+1 o, next time (the i+1 time, i=1,2,3,4 ...) required current initial Cable Structure bearing generalized coordinate vector U circulates i+1 oequal U i o, to A i+1 ocarrying out Mechanics Calculation obtains corresponding to A i+1 oconcrete numerical value all monitored amounts, current, these concrete numerical value form next time (the i+1 time, i=1,2,3,4 ...) the current initial value vector C of the required monitored amount that circulates i+1 o.
B i = B 1 i B 2 i · · · B k i · · · B N i T - - - ( 20 )
Mark vector B in formula (20) isubscript i represent the i time circulation, its element B i k(k=1,2,3 ..., subscript k N) represents the health status feature of k evaluation object, can only get 0 and 1 two amount, concrete value rule is shown in formula (21).
Element B in formula (21) i kmark vector B ik element, D i ukevaluation object unit change vector D i uk element (seeing formula (5)), d i ckthe vectorial d of the current name damage of evaluation object i ck element (seeing formula (14)), they all represent the relevant information of k evaluation object.
D in formula (22) i ukevaluation object unit change vector D i uk element (seeing formula (5)), d i okthe current initial damage vector of evaluation object d i ok element (seeing formula (3)).
The third part of this method: the software and hardware part of health monitoring systems.
Hardware components comprises monitoring system (comprising monitored amount monitoring system, temperature monitoring system, Cable Structure bearing generalized coordinate monitoring system), signal picker and computing machine etc.Require Real-Time Monitoring to obtain the measured data of temperature required and Cable Structure bearing generalized coordinate, require each monitored amount of Real-Time Monitoring simultaneously.
Software section should complete the process that this method sets, complete needed in this method, can be by functions such as computer implemented monitoring, record, control, storage, calculating, notice, warnings.
This method specifically comprises:
A. for sake of convenience, it is evaluation object that this method unitedly calls evaluated support cable and centre-point load, establishes the quantity of evaluated support cable and the quantity sum of centre-point load is N, and the quantity of evaluation object is N; Determine the coding rule of evaluation object, by this rule, by evaluation object numberings all in Cable Structure, this numbering will be for generating vector sum matrix in subsequent step; This method represents this numbering with variable k, k=1, and 2,3 ..., N; Determine the point being monitored of appointment, point being monitored characterizes all specified points of Cable Structure strain information, and gives all specified point numberings; Determine monitored should the changing direction of point being monitored, and number to the monitored strain of all appointments, " monitored strain numbering " will be for generating vector sum matrix in subsequent step, and " the whole monitored strain data of Cable Structure " is comprised of above-mentioned all monitored strains; This method by " the monitored strain data of Cable Structure " referred to as " monitored amount "; The quantity sum of all monitored amounts is designated as M, and M must not be less than N; In this method, to the time interval between any twice measurement of same amount Real-Time Monitoring, must not be greater than 30 minutes, the moment of survey record data is called physical record data constantly;
B. this method definition " the temperature survey calculating method of the Cable Structure of this method " is undertaken by step b1 to b3;
B1: inquiry or actual measurement obtain the temperature variant thermal conduction study parameter of Cable Structure composition material and Cable Structure environment of living in, utilize the geometry measured data of design drawing, as-constructed drawing and the Cable Structure of Cable Structure, utilize these data and parameter to set up the thermal conduction study computation model of Cable Structure, inquiry Cable Structure location is no less than the meteorological data in recent years of 2 years, statistics obtains interior during this period of time cloudy quantity and is designated as T cloudy day, in the method can not be seen to one of the sun daytime and be called all day the cloudy day, statistics obtains 0 highest temperature and the lowest temperature between latter 30 minutes of the moment of sunrise next day at each cloudy day in T cloudy day, sunrise on the meteorology that sunrise refers to base area revolutions constantly and the rule that revolves round the sun is definite constantly, do not represent necessarily can see the sun same day, the sunrise that can inquire about data or calculate each required day by conventional meteorology constantly, each cloudy day 0 up to next day sunrise constantly the highest temperature between latter 30 minutes deduct the maximum temperature difference that the lowest temperature is called this cloudy daily temperature, there is T cloudy day, the maximum temperature difference that just has the daily temperature at T cloudy day, get maximal value in the maximum temperature difference of daily temperature at T cloudy day for reference to temperature difference per day, with reference to temperature difference per day, be designated as Δ T r, between inquiry Cable Structure location and Altitude Region, place, be no less than temperature that the meteorological data in recent years of 2 years or actual measurement obtain Cable Structure environment of living in time with delta data and the Changing Pattern of sea level elevation, calculate the temperature of the Cable Structure environment of living in recent years that is no less than 2 years between Cable Structure location and Altitude Region, place about the maximum rate of change Δ T of sea level elevation h, for convenience of narration, get Δ T hunit be ℃/m, on the surface of Cable Structure, get " R Cable Structure surface point ", get the Specific Principles of " R Cable Structure surface point " narrates in step b3, after will by actual measurement, obtain the temperature of this R Cable Structure surface point, claim that the temperature data that actual measurement obtains is " R Cable Structure surface temperature measured data ", if utilize the thermal conduction study computation model of Cable Structure, by Calculation of Heat Transfer, obtain the temperature of this R Cable Structure surface point, just claim that the temperature data calculating is " R Cable Structure surface temperature computational data ", from the residing minimum height above sea level of Cable Structure to the highest height above sea level, in Cable Structure, uniform choosing is no less than three different sea level elevations, the sea level elevation place choosing at each, at the intersection place on surface level and Cable Structure surface, at least choose two points, outer normal from selected point straw line body structure surface, all outer normal directions of choosing are called " measuring Cable Structure along the direction of the Temperature Distribution of wall thickness ", measure Cable Structure crossing with " intersection on surface level and Cable Structure surface " along the direction of the Temperature Distribution of wall thickness, in the measurement Cable Structure of choosing along comprising the sunny slope outer normal direction of Cable Structure and in the shade outer normal direction of Cable Structure in the direction of the Temperature Distribution of wall thickness, direction uniform choosing in Cable Structure along each measurement Cable Structure along the Temperature Distribution of wall thickness is no less than three points, measure all temperature that are selected a little, the temperature recording is called " Cable Structure is along the temperature profile data of thickness ", wherein along crossing with same " intersection on surface level and Cable Structure surface ", " measure Cable Structure along the direction of the Temperature Distribution of wall thickness " and measure " Cable Structure is along the temperature profile data of thickness " that obtain, be called in the method " identical sea level elevation Cable Structure is along the temperature profile data of thickness ", if chosen H different sea level elevation, at each sea level elevation place, choose B and measured Cable Structure along the direction of the Temperature Distribution of wall thickness, along each, measure Cable Structure and in Cable Structure, chosen E point along the direction of the Temperature Distribution of wall thickness, wherein H and E are not less than 3, B is not less than 2, if HBE is the product of H and B and E, corresponding total HBE " measuring Cable Structure along the point of the temperature profile data of thickness ", after will obtain the temperature that this HBE " measures Cable Structure along the point of the temperature profile data of thickness " by actual measurement, claim that the temperature data that actual measurement obtains is " HBE Cable Structure is along thickness temperature measured data ", if utilize the thermal conduction study computation model of Cable Structure, by Calculation of Heat Transfer, obtain this HBE and measure Cable Structure along the temperature of the point of the temperature profile data of thickness, just claim that the temperature data calculating is " HBE Cable Structure is along thickness temperature computation data ", if BE is the product of B and E, total BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " in sea level elevation place of choosing at each in this method, in Cable Structure location, according to meteorology, measure temperature and require to choose a position, will obtain meeting the temperature that meteorology is measured the Cable Structure place environment of temperature requirement in this position actual measurement, in the on-site spaciousness of Cable Structure, unobstructed place chooses a position, this position should can obtain in each day of the whole year this ground the most sufficient sunshine of getable this day, flat board at a carbon steel material of this position of sound production, be called reference plate, reference plate can not contact with ground, reference plate overhead distance is not less than 1.5 meters, the one side of this reference plate on the sunny side, be called sunny slope, the sunny slope of reference plate is coarse and dark color, the sunny slope of reference plate should can obtain in each day of the whole year one flat plate on this ground the most sufficient sunshine of getable this day, the non-sunny slope of reference plate is covered with insulation material, Real-Time Monitoring is obtained to the temperature of the sunny slope of reference plate,
B2: Real-Time Monitoring obtains R Cable Structure surface temperature measured data of above-mentioned R Cable Structure surface point, Real-Time Monitoring obtains previously defined Cable Structure along the temperature profile data of thickness simultaneously, and Real-Time Monitoring obtains meeting the temperature record that meteorology is measured the Cable Structure place environment of temperature requirement simultaneously, by Real-Time Monitoring, obtain being carved at sunrise the same day sunrise next day temperature measured data sequence of the Cable Structure place environment between latter 30 minutes constantly, the temperature measured data sequence of Cable Structure place environment is arranged according to time order and function order by the temperature measured data that was carved at sunrise the Cable Structure place environment between latter 30 minutes of the moment of sunrise next day the same day, find maximum temperature and minimum temperature in the temperature measured data sequence of Cable Structure place environment, by the maximum temperature in the temperature measured data sequence of Cable Structure place environment, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day that minimum temperature obtains Cable Structure place environment, be called environment maximum temperature difference, be designated as Δ T emax, by the temperature measured data sequence of Cable Structure place environment, by conventional mathematical computations, obtain the temperature of Cable Structure place environment about the rate of change of time, this rate of change is also along with the time changes, by Real-Time Monitoring, obtain being carved at sunrise the same day sunrise next day measured data sequence of the temperature of the sunny slope of the reference plate between latter 30 minutes constantly, the measured data sequence of the temperature of the sunny slope of reference plate by be carved at sunrise the same day next day sunrise constantly the measured data of the temperature of the sunny slope of the reference plate between latter 30 minutes according to time order and function order, arrange, find maximum temperature and minimum temperature in the measured data sequence of temperature of sunny slope of reference plate, by the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day of temperature that minimum temperature obtains the sunny slope of reference plate, be called reference plate maximum temperature difference, be designated as Δ T pmax, by Real-Time Monitoring, obtain being carved at sunrise the same day sunrise next day Cable Structure surface temperature measured data sequence of all R Cable Structure surface points between latter 30 minutes constantly, there is R Cable Structure surface point just to have R Cable Structure surface temperature measured data sequence, each Cable Structure surface temperature measured data sequence by be carved at sunrise on same day of a Cable Structure surface point sunrise next day constantly the Cable Structure surface temperature measured data between latter 30 minutes according to time order and function order, arrange, find maximum temperature and minimum temperature in each Cable Structure surface temperature measured data sequence, by the maximum temperature in each Cable Structure surface temperature measured data sequence, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day that minimum temperature obtains the temperature of each Cable Structure surface point, there is R Cable Structure surface point just to have and be carved at sunrise the sunrise next day maximum temperature difference numerical value between latter 30 minutes constantly R the same day, maximal value is wherein called Cable Structure surface maximum temperature difference, be designated as Δ T smax, by each Cable Structure surface temperature measured data sequence, by conventional mathematical computations, obtain the temperature of each Cable Structure surface point about the rate of change of time, the temperature of each Cable Structure surface point about the rate of change of time also along with the time changes, by Real-Time Monitoring, obtain being carved at sunrise the same day between latter 30 minutes of the moment of sunrise next day, at synchronization, after HBE " Cable Structure is along the temperature profile data of thickness ", the sea level elevation place that calculating is chosen at each amounts to maximum temperature in BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " and the difference of minimum temperature, the absolute value of this difference is called " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", chosen H different sea level elevation and just had H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", claim that the maximal value in this H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference " is " Cable Structure thickness direction maximum temperature difference ", be designated as Δ T tmax,
B3: measure and calculate acquisition Cable Structure steady temperature data, first, determine the moment that obtains Cable Structure steady temperature data, the condition relevant to the moment that determines acquisition Cable Structure steady temperature data has six, first condition is the moment that obtains Cable Structure steady temperature data to be carved at sunset sunrise next day constantly between latter 30 minutes between the same day, sunset refers to sunset on base area revolutions and the definite meteorology of revolution rule constantly constantly, and the sunset that can inquire about data or calculate each required day by conventional meteorology constantly, the a condition of second condition be the same day be carved at sunrise next day sunrise constantly between latter 30 minutes during this period of time in, reference plate maximum temperature difference Δ T pmaxwith Cable Structure surface maximum temperature difference Δ T smaxall be not more than 5 degrees Celsius, the b condition of second condition be the same day be carved at sunrise next day sunrise constantly between latter 30 minutes during this period of time in, above, measure the environment maximum error Δ T calculating emaxbe not more than with reference to temperature difference per day Δ T r, and reference plate maximum temperature difference Δ T pmaxafter deducting 2 degrees Celsius, be not more than Δ T emax, and Cable Structure surface maximum temperature difference Δ T smaxbe not more than Δ T pmax, only needing to meet in a condition of second and b condition one is just called and meets second condition, the 3rd condition is that the temperature of Cable Structure place environment is not more than 0.1 degree Celsius per hour about the absolute value of the rate of change of time in the moment that obtains Cable Structure steady temperature data, the 4th condition is that the temperature of each the Cable Structure surface point in R Cable Structure surface point is not more than 0.1 degree Celsius per hour about the absolute value of the rate of change of time in the moment that obtains Cable Structure steady temperature data, the 5th condition is in the moment that obtains Cable Structure steady temperature data, and the Cable Structure surface temperature measured data of each the Cable Structure surface point in R Cable Structure surface point is to be carved at sunrise the sunrise next day minimal value between latter 30 minutes constantly the same day, the 6th condition is at the moment that obtains Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T tmaxbe not more than 1 degree Celsius, this method is utilized above-mentioned six conditions, any one in following three kinds of moment is called to " obtaining the mathematics of Cable Structure steady temperature data constantly ", the first is first moment to the 5th condition meeting in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, the second is the moment that only meets the 6th condition in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, the third is first moment to the 6th condition simultaneously meeting in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, when obtaining the mathematics of Cable Structure steady temperature data, be exactly in this method during in constantly one of physical record data constantly, the moment that obtains Cable Structure steady temperature data be exactly obtain Cable Structure steady temperature data mathematics constantly, if obtain the mathematics of Cable Structure steady temperature data and be not constantly any in constantly of physical record data in this method constantly, get this method close to moment of the mathematics that obtains Cable Structure steady temperature data those physical record data constantly for obtaining the moment of Cable Structure steady temperature data, this method is carried out the relevant health monitoring analysis of Cable Structure by using in the amount that obtains the moment survey record of Cable Structure steady temperature data, this method is approximate thinks that the Cable Structure temperature field in moment of obtaining Cable Structure steady temperature data is in stable state, i.e. this Cable Structure temperature constantly temporal evolution not, and this is exactly " obtaining the moment of Cable Structure steady temperature data " of this method constantly, then, according to Cable Structure heat transfer characteristic, utilize " R the Cable Structure surface temperature measured data " and " HBE Cable Structure is along thickness temperature measured data " in the moment that obtains Cable Structure steady temperature data, utilize the thermal conduction study computation model of Cable Structure, by conventional Calculation of Heat Transfer, obtain in the Temperature Distribution of Cable Structure that obtains the moment of Cable Structure steady temperature data, now calculate by stable state in the temperature field of Cable Structure, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculating comprises the accounting temperature of R Cable Structure surface point in Cable Structure, the accounting temperature of R Cable Structure surface point is called R Cable Structure stable state surface temperature computational data, also comprise that Cable Structure is in the accounting temperature of selected HBE " measuring Cable Structure along the point of the temperature profile data of thickness " above, the accounting temperature of HBE " measuring Cable Structure along the point of the temperature profile data of thickness " is called " HBE Cable Structure is along thickness temperature computation data ", when R Cable Structure surface temperature measured data and R Cable Structure stable state surface temperature computational data correspondent equal, and when " HBE Cable Structure is along thickness temperature measured data " and " HBE Cable Structure is along thickness temperature computation data " correspondent equal, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculating is called " Cable Structure steady temperature data " in the method, " R Cable Structure surface temperature measured data " is now called " R Cable Structure stable state surface temperature measured data ", " HBE Cable Structure is along thickness temperature measured data " is called " HBE Cable Structure is along thickness steady temperature measured data ", while getting " R Cable Structure surface point " on the surface of Cable Structure, the quantity of " R Cable Structure surface point " and necessary three conditions that meet that distribute, first condition is when Cable Structure temperature field is during in stable state, on Cable Structure surface the temperature of any point be by " R Cable Structure surface point " with Cable Structure surface on the observed temperature linear interpolation of the adjacent point in this arbitrfary point while obtaining, on the Cable Structure surface that linear interpolation obtains, on the temperature of this arbitrfary point and Cable Structure surface, the error of the actual temperature of this arbitrfary point is not more than 5%, Cable Structure surface comprises support cable surface, second condition is that in " R Cable Structure surface point ", the quantity at the point of same sea level elevation is not less than 4, and uniform along Cable Structure surface at the point of same sea level elevation in " R Cable Structure surface point ", " R Cable Structure surface point " is not more than 0.2 ℃ divided by Δ T along the maximal value Δ h in the absolute value of all differences of the sea level elevation of adjacent Cable Structure surface point between two of sea level elevation hthe numerical value obtaining, gets Δ T for convenience of narration hunit be ℃/m that the unit of getting Δ h for convenience of narration is m, " R Cable Structure surface point " refers to while only considering sea level elevation along the definition of adjacent Cable Structure surface point between two of sea level elevation, in " R Cable Structure surface point ", do not have a Cable Structure surface point, the sea level elevation numerical value of this Cable Structure surface point is between the sea level elevation numerical value of adjacent Cable Structure surface point between two, the 3rd condition is inquiry or obtains the rule at sunshine between Cable Structure location and Altitude Region, place by meteorology conventionally calculation, again according to the geometric properties of Cable Structure and bearing data, in Cable Structure, find and be subject to the sunshine-duration position of those surface points the most fully the whole year, in " R Cable Structure surface point ", having a Cable Structure surface point at least is the annual point being subject in the most sufficient those surface points of sunshine-duration in Cable Structure,
C. according to " the temperature survey calculating method of the Cable Structure of this method ", directly measure and calculate the Cable Structure steady temperature data under original state, Cable Structure steady temperature data under original state are called initial Cable Structure steady temperature data, are designated as " initial Cable Structure steady temperature data vector T o", actual measurement or consult reference materials and obtain the temperature variant physical and mechanical properties parameter of the various materials that Cable Structure used, in actual measurement, obtain T otime, namely obtaining initial Cable Structure steady temperature data vector T othe synchronization in the moment, directly measure the measured data that calculates initial Cable Structure, the measured data of initial Cable Structure is to comprise Cable Structure centre-point load measurement data, Cable Structure distributed load measurement data, Cable Structure volume load measurement data, the initial value of all monitored amounts, the initial rope force data of all support cables, initial Cable Structure modal data, initial Cable Structure strain data, initial Cable Structure geometric data, initial Cable Structure bearing generalized coordinate data, initial Cable Structure angle-data, initial Cable Structure spatial data is in interior measured data, initial Cable Structure bearing generalized coordinate data comprise initial Cable Structure bearing spatial data and initial Cable Structure bearing angular data, when obtaining the measured data of initial Cable Structure, measurement calculates the data of the health status that can express support cable of the Non-destructive Testing Data that comprises support cable, and the data of the health status that can express support cable are now called support cable initial health data, the initial value of all monitored amounts forms monitored amount initial value vector C o, monitored amount initial value vector C othe coding rule of coding rule and M monitored amount identical, utilize support cable initial health data and Cable Structure centre-point load measurement data to set up evaluation object initial damage vector d o, vectorial d orepresent with initial mechanical calculating benchmark model A othe initial health of the evaluation object of the Cable Structure representing, evaluation object initial damage vector d oelement number equal N, d oelement and evaluation object be one-to-one relationship, vectorial d othe coding rule of element identical with the coding rule of evaluation object, if d oevaluation object corresponding to some elements be support cable, so a d in cable system othe numerical value of this element represent the initial damage degree of corresponding support cable, if the numerical value of this element is 0, represent that the corresponding support cable of this element is intact, do not damage, if its numerical value is 100%, represent that the corresponding support cable of this element has completely lost load-bearing capacity, if its numerical value between 0 and 100%, represents this support cable, lost the load-bearing capacity of corresponding proportion, if d oevaluation object corresponding to some elements be some centre-point load, in this method, get d othis element numerical value be 0, the initial value that represents the variation of this centre-point load is 0, if while there is no the Non-destructive Testing Data of support cable and the data of other health status that can express support cable, or can think that structure original state is not damaged during without relaxed state, vectorial d oin each element numerical value relevant to support cable get 0, initial Cable Structure bearing generalized coordinate data form initial Cable Structure bearing generalized coordinate vector U o,
The temperature variant physical and mechanical properties parameter of the various materials that d. use according to measured data, support cable initial health data, Cable Structure centre-point load measurement data, Cable Structure distributed load measurement data, Cable Structure volume load measurement data, the Cable Structure of the design drawing of Cable Structure, as-constructed drawing and initial Cable Structure, initial Cable Structure bearing generalized coordinate vector U o, initial Cable Structure steady temperature data vector T owith all Cable Structure data that preceding step obtains, set up the initial mechanical calculating benchmark model A of the Cable Structure that counts " Cable Structure steady temperature data " o, based on A othe Cable Structure computational data calculating must approach its measured data very much, and difference therebetween must not be greater than 5%; Corresponding to A o" Cable Structure steady temperature data " be exactly " initial Cable Structure steady temperature data vector T o"; Corresponding to A ocable Structure bearing generalized coordinate data be exactly initial Cable Structure bearing generalized coordinate vector U o; Corresponding to A oevaluation object initial damage vector d for evaluation object health status orepresent; Corresponding to A omonitored amount initial value vector C for the initial value of all monitored amounts orepresent; U o, T oand d oa oparameter, by A oinitial value and the C of all monitored amounts of obtaining of Mechanics Calculation result othe initial value of all monitored amounts that represent is identical, therefore also can say C oby A omechanics Calculation result form, A in the method o, C o, d o, U oand T oconstant;
E. in the method, alphabetical i, except representing that significantly, the place of number of steps, alphabetical i only represents cycle index, circulates for the i time; When the i time circulation starts, the current initial mechanical calculating benchmark model of Cable Structure that need to set up or that set up is designated as current initial mechanical calculating benchmark model A i o, A oand A i ocount temperature parameter, can accounting temperature change the Effect on Mechanical Properties to Cable Structure; When the i time circulation starts, corresponding to A i o" Cable Structure steady temperature data " with current initial Cable Structure steady temperature data vector T i orepresent vector T i odefinition mode and vector T odefinition mode identical, T i oelement and T oelement corresponding one by one; When the i time circulation starts, corresponding to A i o" Cable Structure bearing generalized coordinate data " with current initial Cable Structure bearing generalized coordinate vector U i orepresent vectorial U i odefinition mode and vectorial U odefinition mode identical, U i oelement and U oelement corresponding one by one; The current initial damage vector of evaluation object that the i time circulation needs while starting is designated as d i o, d i ocable Structure A while representing this circulation beginning i othe health status of evaluation object, d i odefinition mode and d odefinition mode identical, d i oelement and d oelement corresponding one by one; When the i time circulation starts, the initial value of all monitored amounts, with the current initial value vector of monitored amount C i orepresent vectorial C i odefinition mode and vectorial C odefinition mode identical, C i oelement and C oelement corresponding one by one, the current initial value vector of monitored amount C i oexpression is corresponding to A i othe concrete numerical value of all monitored amounts; U i o, T i oand d i oa i ocharacterisitic parameter, C i oby A i omechanics Calculation result form; When circulation starts for the first time, A i obe designated as A 1 o, set up A 1 omethod for making A 1 oequal A o; When circulation starts for the first time, T i obe designated as T 1 o, set up T 1 omethod for making T 1 oequal T o; When circulation starts for the first time, U i obe designated as U 1 o, set up U 1 omethod for making U 1 oequal U o; When circulation starts for the first time, d i obe designated as d 1 o, set up d 1 omethod for making d 1 oequal d o; When circulation starts for the first time, C i obe designated as C 1 o, set up C 1 omethod for making C 1 oequal C o;
F. from entering the circulation that is walked q step by f here; In structure military service process, according to " the temperature survey calculating method of the Cable Structure of this method " continuous Actual measurement, obtain the current data of Cable Structure steady temperature data, the current data of all " Cable Structure steady temperature data " forms current cable structure steady temperature data vector T i, vector T idefinition mode and vector T odefinition mode identical, T ielement and T oelement corresponding one by one; In actual measurement, obtain current cable structure steady temperature data vector T isynchronization, actual measurement obtains Cable Structure bearing generalized coordinate current data, all Cable Structure bearing generalized coordinate current datas form current cable structures actual measurement bearing generalized coordinate vector U i, vectorial U idefinition mode and vectorial U odefinition mode identical; In actual measurement, obtain vector T itime, actual measurement obtains obtaining current cable structure steady temperature data vector T ithe Cable Structure of synchronization in the moment in the currency of all monitored amounts, all these numerical value form monitored amount current value vector C i, vectorial C idefinition mode and vectorial C odefinition mode identical, C ielement and C oelement corresponding one by one, represent that identical monitored amount is at numerical value in the same time not;
G. according to current cable structure actual measurement bearing generalized coordinate vector U iwith current cable structure steady temperature data vector T i, according to step g 1 to g3, upgrade current initial mechanical calculating benchmark model A i o, the current initial value of monitored amount vector C i o, current initial Cable Structure steady temperature data vector T i owith current initial Cable Structure bearing generalized coordinate vector U i o, and the current initial damage vector of evaluation object d i oremain unchanged;
G1. compare respectively T iand T i o, U iand U i oif, T iequal T i oand U iequal U i o, do not need A i oupgrade, otherwise need to follow these steps to A i o, U i oand T i oupgrade;
G2. calculate U iwith U opoor, U iwith U odifference be exactly Cable Structure bearing about the generalized displacement of support of initial position, with generalized displacement of support vector V, represent generalized displacement of support, V equals U ideduct U o; Calculate T iwith T opoor, T iwith T odifference be exactly that current cable structure steady temperature data are about the variation of initial Cable Structure steady temperature data, T iwith T opoor with steady temperature change vector S, represent, S equals T ideduct T o, S represents the variation of Cable Structure steady temperature data;
G3. first to A oin Cable Structure bearing apply generalized displacement of support constraint, the numerical value of generalized displacement of support constraint is just taken from the numerical value of corresponding element in generalized displacement of support vector V, then to A oin Cable Structure apply temperature variation, the numerical value of the temperature variation applying is just taken from steady temperature change vector S, to A omiddle Cable Structure bearing applies generalized displacement of support constraint and Cable Structure is applied and obtains the current initial mechanical calculating benchmark model A that upgrades after temperature variation i o, upgrade A i otime, U i oall elements numerical value is also used U iall elements numerical value is corresponding to be replaced, and has upgraded U i o, T i oall elements numerical value is also used T icorresponding replacement of all elements numerical value, upgraded T i o, so just obtained correctly corresponding to A i ou i oand T i o, d now i oremain unchanged; When upgrading A i oafter, A i othe current initial damage of the evaluation object vector d for health status of rope i orepresent A i ocurrent cable structure steady temperature data vector T for Cable Structure steady temperature i orepresent A i ocurrent initial Cable Structure bearing generalized coordinate vector U for bearing generalized coordinate i orepresent; Upgrade C i omethod be: when upgrading A i oafter, by Mechanics Calculation, obtain A i oin concrete numerical value all monitored amounts, current, these concrete numerical value form C i o;
H. at current initial mechanical calculating benchmark model A i obasis on, according to step h1, carry out several times Mechanics Calculation to step h4, by calculating, set up unit damage monitored numerical quantity transformation matrices Δ C iwith evaluation object unit change vector D i u;
H1. when the i time circulation starts, directly press step h2 to the listed method acquisition of step h4 Δ C iand D i u; At other constantly, when in step g to A i oafter upgrading, must regain Δ C to the listed method of step h4 by step h2 iand D i uif, in step g not to A i oupgrade, directly proceed to herein step I and carry out follow-up work;
H2. at current initial mechanical calculating benchmark model A i obasis on carry out several times Mechanics Calculation, on calculation times numerical value, equal the quantity N of all evaluation objects, have N evaluation object just to have N calculating; Coding rule according to evaluation object, calculates successively; Calculating each time hypothesis only has an evaluation object on the basis of original damage or centre-point load, to increase unit damage or centre-point load unit change again, concrete, if this evaluation object is a support cable in cable system, so just suppose that this support cable increases unit damage again, if this evaluation object is a centre-point load, just suppose that this centre-point load increases centre-point load unit change again, uses D i ukrecord unit damage or the centre-point load unit change of this increase, wherein k represents to increase the numbering of the evaluation object of unit damage or centre-point load unit change, D i ukevaluation object unit change vector D i uan element, evaluation object unit change vector D i ucoding rule and the vectorial d of element othe coding rule of element identical; The evaluation object that increases again unit damage or centre-point load unit change in calculating is each time different from the evaluation object that increases again unit damage or centre-point load unit change in other calculating, calculate each time the current calculated value that all utilizes mechanics method to calculate all monitored amounts of Cable Structure, the current calculated value of all monitored amounts that calculate each time forms a monitored amount calculation current vector; When k evaluation object of hypothesis increases unit damage or centre-point load unit change again, use C i tkrepresent corresponding " monitored amount calculation current vector "; While giving in this step each vectorial element numbering, should use same coding rule with other vector in this method, to guarantee any one element in each vector in this step, with in other vector, number identical element, expressed the relevant information of same monitored amount or same target; C i tkdefinition mode and vectorial C odefinition mode identical, C i tkelement and C oelement corresponding one by one;
H3. the vectorial C calculating each time i tkdeduct vectorial C i oobtain a vector, then obtain " numerical value change vector δ a C for monitored amount after each element of this vector is calculated to the unit damage suppose or centre-point load unit change numerical value divided by this i k"; There is N evaluation object just to have N " the numerical value change vector of monitored amount ";
H4. by this N " the numerical value change vector of monitored amount ", according to the coding rule of N evaluation object, form successively " the unit damage monitored numerical quantity transformation matrices Δ C that has N row i"; Unit damage monitored numerical quantity transformation matrices Δ C ieach row corresponding to a monitored amount unit change vector; Unit damage monitored numerical quantity transformation matrices Δ C ievery a line corresponding to same monitored amount the different unit change amplitude when different evaluation objects increase unit damage or centre-point load unit change; Unit damage monitored numerical quantity transformation matrices Δ C icoding rule and the vectorial d of row othe coding rule of element identical, unit damage monitored numerical quantity transformation matrices Δ C ithe coding rule of coding rule and M monitored amount of row identical;
I. define the vectorial d of current name damage i cwith current actual damage vector d i, d i cand d ielement number equal the quantity of evaluation object, d i cand d ielement and evaluation object between be one-to-one relationship, d i celement numerical value represent nominal degree of injury or the nominal centre-point load variable quantity of corresponding evaluation object, d i cand d iwith evaluation object initial damage vector d oelement coding rule identical, d i celement, d ielement and d oelement be one-to-one relationship;
J. according to monitored amount current value vector C iwith " the current initial value vector of monitored amount C i o", " unit damage monitored numerical quantity transformation matrices Δ C i" and " the vectorial d of current name damage i c" between the linear approximate relationship that exists, this linear approximate relationship can be expressed as formula 1, in formula 1 except d i cother outer amount is known, solves formula 1 and just can calculate the vectorial d of current name damage i c;
C i = C o i + Δ C i · d c i Formula 1
K. the current actual damage vector d that utilizes formula 2 to express ik element d i kwith the current initial damage vector of evaluation object d i ok element d i okwith the vectorial d of current name damage i ck element d i ckbetween relation, calculate current actual damage vector d iall elements;
K=1 in formula 2,2,3 ..., N; d i kthe current actual health status that represents k evaluation object in the i time circulation, if this evaluation object is support cable, so a d in cable system i krepresent its current actual damage, d i kbe to represent not damaged at 0 o'clock, while being 100%, represent that this support cable thoroughly loses load-bearing capacity, in the time of between 0 and 100%, represent to lose the load-bearing capacity of corresponding proportion; If this evaluation object is centre-point load, so a d i kthe actual change amount that represents this centre-point load; So far this method has realized and has rejected damaged cable identification impact, Cable Structure that generalized displacement of support, centre-point load variation and structure temperature change, and has realized simultaneously and has rejected generalized displacement of support, structure temperature variation and identification support cable health status variable effect, centre-point load variable quantity;
L. try to achieve the vectorial d of current name damage i cafter, according to formula 3, set up mark vector B i, formula 4 has provided mark vector B ithe definition of k element;
B i = B 1 i B 2 i · · · B k i · · · B N i T Formula 3
Element B in formula 4 i kmark vector B ik element, D i ukevaluation object unit change vector D i uk element, d i ckthe vectorial d of the current name damage of evaluation object i ck element, they all represent the relevant information of k evaluation object, k=1 in formula 4,2,3 ..., N;
If mark vector B m. ielement be 0 entirely, get back to step f and continue this circulation; If mark vector B ielement be not 0 entirely, enter next step, be step n;
N. according to formula 5 calculate next time, i.e. the i+1 time current initial damage vector of the required evaluation object of circulation d i+1 oeach element;
D in formula 5 i+1 okthe current initial damage vector of the required evaluation object d that next time, circulates for the i+1 time i+1 ok element, d i okthe current initial damage vector of the evaluation object d that is this, circulates for the i time i ok element, D i ukthe evaluation object unit change vector D of the i time circulation i uk element, B i kthe mark vector B of the i time circulation ik element, k=1 in formula 5,2,3 ..., N;
O. at initial mechanical calculating benchmark model A obasis on, first to A oin Cable Structure bearing apply generalized displacement of support constraint, the numerical value of generalized displacement of support constraint is just taken from the numerical value of corresponding element in generalized displacement of support vector V, then to A oin Cable Structure apply temperature variation, the numerical value of the temperature variation applying is just taken from steady temperature change vector S, then to make the health status of rope be d i+1 oafter obtain be exactly next time, i.e. the i+1 time required Mechanics Calculation benchmark model A of circulation i+1; Obtain A i+1after, by Mechanics Calculation, obtain A i+1in concrete numerical value all monitored amounts, current, these concrete numerical value form next time, the vectorial C of the current initial value of required monitored amount that circulates for the i+1 time i+1 o;
P. take off once, i.e. the i+1 time required current initial Cable Structure steady temperature data vector T of circulation i+1 oequal the current initial Cable Structure steady temperature data vector T of the i time circulation i o; The required current initial Cable Structure bearing generalized coordinate vector U of the i+1 time circulation next time, i.e. i+1 oequal the current initial Cable Structure bearing generalized coordinate vector U of the i time circulation i o;
Q. get back to step f, start circulation next time.
Beneficial effect: in current published correlation technique, some only can when other all conditions is constant, (load of only only having structure to bear changes, and structural health conditions etc. are all constant) variation of recognition structure bearing load, some only can (only only have structural health conditions to change when other all conditions is constant, and the load that structure is born etc. are constant) variation of recognition structure health status, some only can (only only have structure temperature and structural health conditions to change when other all conditions is constant, and the load that structure is born is constant) variation of recognition structure health status, when the load of bearing in structure, structure (environment) temperature and structural health conditions change simultaneously, when Cable Structure generation generalized displacement of support, also there is no at present a kind of disclosed, effective method load that recognition structure bears simultaneously and the variation of structural health conditions, when structure bearing load and structure (environment) temperature change simultaneously, the variation and the structure temperature that also do not have effective method can reject Cable Structure generalized displacement of support, structure bearing load change the impact on structural health conditions recognition result in other words, changing an angle sees, in current disclosed method, thereby also there is not rejecting the correct knowledge method for distinguishing of realizing centre-point load intensity of variation of Cable Structure generalized displacement of support, structure temperature variation and the impact of support cable health status, and concerning structure, the identification of load change is also very important, with existing method, compare, this method can be when Cable Structure generation generalized displacement of support, when the centre-point load of bearing in structure and structure temperature change, can reject Cable Structure generalized displacement of support, variation and structure temperature that structure is born centre-point load change the impact on structural health conditions recognition result, can identify very exactly damaged cable, solved monitoring structural health conditions field problem in the urgent need to address, otherwise, if can not reject Cable Structure generalized displacement of support, structure temperature changes and the impact of the variation of the centre-point load that structure is born, just can not identify exactly damaged cable, moreover, this method is when identifying damaged cable, can also identify the variation of centre-point load simultaneously, be that this method can be rejected Cable Structure generalized displacement of support, structure temperature changes and the impact of support cable health status variation, realize the correct identification of centre-point load intensity of variation, otherwise, if can not reject the impact that Cable Structure generalized displacement of support, structure temperature variation and support cable health status change, just can not identify exactly the intensity of variation of centre-point load.That is to say, this method has realized two kinds of functions that existing method can not possess, respectively: one, when Cable Structure generation generalized displacement of support, during the centre-point load of bearing in structure and structure (environment) temperature variation, can reject Cable Structure generalized displacement of support, centre-point load variation and structure temperature and change the impact on Cable Structure health status recognition result, thereby identify exactly the structure health monitoring method of damaged cable; Two, this method is when identifying damaged cable, can also identify the variation of centre-point load simultaneously, be that this method can be rejected Cable Structure generalized displacement of support, structure temperature changes and the impact of support cable health status variation, realize the correct identification of centre-point load intensity of variation.
Embodiment
For cable structure health monitoring problem, this method has realized two kinds of functions that existing method can not possess, respectively: one, when Cable Structure generation generalized displacement of support, during the centre-point load of bearing in structure and structure (environment) temperature variation, can reject Cable Structure generalized displacement of support, centre-point load variation and structure temperature and change the impact on Cable Structure health status recognition result, thereby identify exactly the structure health monitoring method of damaged cable; Two, this method is when identifying damaged cable, can also identify the variation of centre-point load simultaneously, be that this method can be rejected Cable Structure generalized displacement of support, structure temperature changes and the impact of support cable health status variation, realize the correct identification of centre-point load intensity of variation.The following describes of the embodiment of this method is in fact only exemplary, and object is never to limit application or the use of this method.
This method adopts a kind of algorithm, and this algorithm is for identifying the variation of damaged cable and centre-point load.During concrete enforcement, the following step is a kind of in the various steps that can take.
The first step: the quantity of first confirming the centre-point load that may change that Cable Structure is born.The feature of the centre-point load of bearing according to Cable Structure, confirm wherein " centre-point load likely changing ", or all centre-point load is considered as " centre-point load likely changing ", establishes total JZW the centre-point load that may change.
Centre-point load is divided into two kinds of concentrated force and concentrated couples, in coordinate system, for example, in Descartes's rectangular coordinate system, a concentrated force can resolve into three components, same, a concentrated couple also can resolve into three components, in the method a concentrated force component or a concentrated couple component is called to a centre-point load.
If the quantity sum of the quantity of the support cable of Cable Structure and JZW " centre-point load likely changing " is N.For sake of convenience, it is " evaluation object " that this method unitedly calls evaluated support cable and " centre-point load likely changing ", total N evaluation object.Give evaluation object serial number, this numbering will be for generating vector sum matrix in subsequent step.
" the whole monitored strain data of structure " can be described by the strain of a L assigned direction specified point and each specified point of K in structure, and the variation of structural strain data is exactly the variation of all strains of K specified point.Each total M(M=K * L) individual strain measurement value or calculated value characterize structural strain information.K and M generally must not be less than N.
Comprehensive above-mentioned monitored amount, total M the monitored amount of whole Cable Structure, M must not be less than the quantity N of evaluation object.
For simplicity, in the method by " monitored all parameters of Cable Structure " referred to as " monitored amount ".Give M monitored amount serial number, this numbering will be for generating vector sum matrix in subsequent step.This method is with representing this numbering with variable j, j=1, and 2,3 ..., M.
Determine " the temperature survey calculating method of the Cable Structure of this method ", the method concrete steps are as follows:
A step: inquiry or actual measurement (can be measured by conventional thermometry, for example use thermal resistance to measure) obtain the temperature variant thermal conduction study parameter of Cable Structure composition material and Cable Structure environment of living in, utilize the geometry measured data of design drawing, as-constructed drawing and the Cable Structure of Cable Structure, utilize these data and parameter to set up the thermal conduction study computation model of Cable Structure (for example finite element model).Inquiry Cable Structure location is no less than the meteorological data in recent years of 2 years, statistics obtains interior during this period of time cloudy quantity and is designated as T cloudy day, statistics obtains 0 highest temperature and the lowest temperature between latter 30 minutes of the moment of sunrise next day at each cloudy day in T cloudy day, sunrise on the meteorology that sunrise refers to base area revolutions constantly and the rule that revolves round the sun is definite constantly, the sunrise that can inquire about data or calculate each required day by conventional meteorology constantly, each cloudy day 0 up to next day sunrise constantly the highest temperature between latter 30 minutes deduct the maximum temperature difference that the lowest temperature is called this cloudy daily temperature, there is T cloudy day, the maximum temperature difference that just has the daily temperature at T cloudy day, get maximal value in the maximum temperature difference of daily temperature at T cloudy day for reference to temperature difference per day, with reference to temperature difference per day, be designated as Δ T r, between inquiry Cable Structure location and Altitude Region, place, be no less than temperature that the meteorological data in recent years of 2 years or actual measurement obtain Cable Structure environment of living in time with delta data and the Changing Pattern of sea level elevation, calculate the temperature of the Cable Structure environment of living in recent years that is no less than 2 years between Cable Structure location and Altitude Region, place about the maximum rate of change Δ T of sea level elevation h, for convenience of narration, get Δ T hunit be ℃/m, on the surface of Cable Structure, get " R Cable Structure surface point ", get the Specific Principles of " R Cable Structure surface point " narrates in step b3, after will by actual observation record, obtain the temperature of this R Cable Structure surface point, claim that the temperature data that actual measurement obtains is " R Cable Structure surface temperature measured data ", if utilize the thermal conduction study computation model of Cable Structure, by Calculation of Heat Transfer, obtain the temperature of this R Cable Structure surface point, just claim that the temperature data calculating is " R Cable Structure surface temperature computational data ".From the residing minimum height above sea level of Cable Structure to the highest height above sea level, in Cable Structure, uniform choosing is no less than three different sea level elevations, if for example the sea level elevation of Cable Structure is between 0m to 200m, can choose height above sea level 0m so, 50m, 100m and height above sea level 200m, intersect with imaginary surface level and Cable Structure surface at the sea level elevation place choosing at each, obtain intersection, the crossing cross surface that obtains of surface level and Cable Structure, intersection is the outer edge line of cross surface, at the intersection place on surface level and Cable Structure surface, choose 6 points, outer normal from selected point straw line body structure surface, all outer normal directions of choosing are called " measuring Cable Structure along the direction of the Temperature Distribution of wall thickness ", measure Cable Structure crossing with " intersection on surface level and Cable Structure surface " along the direction of the Temperature Distribution of wall thickness.In the measurement Cable Structure of choosing along in 6 directions of the Temperature Distribution of wall thickness, first according to the meteorological data throughout the year in region, Cable Structure position and the physical dimension of Cable Structure, volume coordinate, the sunny slope of definite Cable Structure such as Cable Structure surrounding environment and in the shade, the sunny slope of Cable Structure and in the shade face are surperficial parts for Cable Structure, the sea level elevation place choosing at each, aforementioned intersection respectively has one section in sunny slope and in the shade, two sections of these of intersection respectively have a mid point, cross these two mid points and get the outer normal of Cable Structure, this method is called the sunny slope outer normal of Cable Structure and in the shade outer normal of Cable Structure by these two outer normals, this method is called the sunny slope outer normal direction of Cable Structure and in the shade outer normal direction of Cable Structure by these two outer normal directions, the outer normal of obvious sunny slope and the outer normal of in the shade all intersect with aforementioned intersection, also just there are two intersection points, these two intersection points are divided into two line segments by intersection, on two line segments, get respectively 2 points, totally 4 points, taken point is divided into equal in length 3 sections by each line segment in two line segments of intersection, at these 4 some places, get the outer normal on Cable Structure surface, at each selected sea level elevation place, just chosen altogether like this outer normal on 6 Cable Structure surfaces, the direction of 6 outer normals is exactly " measuring Cable Structure along the direction of the Temperature Distribution of wall thickness ".There are two intersection points on the surface of each " measures Cable Structure along the direction of the Temperature Distribution of wall thickness " line and Cable Structure, if Cable Structure is hollow, one, these two intersection points are on Cable Structure outside surface, another is on inside surface, if Cable Structure is solid, these two intersection points are all on Cable Structure outside surface, connect these two intersection points and obtain a straight-line segment, on straight-line segment, choose again three points, these three these straight-line segments of naming a person for a particular job are divided into four sections, three points measuring that Cable Structure chooses at this and two end points of straight-line segment, the temperature that amounts to 5 points, concrete can first hole in Cable Structure, how temperature sensor is embedded in to this 5 some places, the temperature recording is called this place " Cable Structure is along the temperature profile data of thickness ", wherein along crossing with same " intersection on surface level and Cable Structure surface ", " measure Cable Structure along the direction of the Temperature Distribution of wall thickness " and measure " Cable Structure is along the temperature profile data of thickness " that obtain, be called in the method " identical sea level elevation Cable Structure is along the temperature profile data of thickness ".If chosen H different sea level elevation, at each sea level elevation place, choose B and measured Cable Structure along the direction of the Temperature Distribution of wall thickness, along each, measure Cable Structure and in Cable Structure, chosen E point along the direction of the Temperature Distribution of wall thickness, wherein H and E are not less than 3, B is not less than 2, if HBE is the product of H and B and E, corresponding total HBE " measuring Cable Structure along the point of the temperature profile data of thickness ", after will obtain the temperature that this HBE " measures Cable Structure along the point of the temperature profile data of thickness " by actual measurement, claim that the temperature data that actual measurement obtains is " HBE Cable Structure is along thickness temperature measured data ", if utilize the thermal conduction study computation model of Cable Structure, by Calculation of Heat Transfer, obtain this HBE and measure Cable Structure along the temperature of the point of the temperature profile data of thickness, just claim that the temperature data calculating is " HBE Cable Structure is along thickness temperature computation data ", if BE is the product of B and E, total BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " in sea level elevation place of choosing at each in this method.In Cable Structure location, according to meteorology, measure temperature and require to choose a position, will in this position actual observation record, obtain meeting the temperature that meteorology is measured the Cable Structure place environment of temperature requirement, in the on-site spaciousness of Cable Structure, unobstructed place chooses a position, this position should can obtain in each day of the whole year this ground the most sufficient sunshine of getable this day (as long as had sunrise the same day, this position just should be arrived by solar radiation), for example, flat board (square that for example the wide 3mm of 30cm is thick is dull and stereotyped) at carbon steel material of this position of sound production (No. 45 carbon steels), be called reference plate, reference plate can not contact with ground, reference plate overhead distance is not less than 1.5 meters, reference plate can be placed in and meet the top that meteorology temperature is measured the wooden thermometer screen requiring, the one side of this reference plate on the sunny side, (be for example called sunny slope, in the time of on the Northern Hemisphere, sunny slope faces up towards south, full daytime is all by sunshine, sunny slope should have the suitable gradient to make snow can not accumulate or clear up sunny slope after snow), the sunny slope of reference plate is coarse and (being conducive to accept solar irradiation) dark color, the sunny slope of reference plate should can obtain in each day of the whole year one flat plate on this ground the most sufficient sunshine of getable this day, the non-sunny slope of reference plate is covered with insulation material (for example thick calcium carbonate insulation material of 5mm), Real-Time Monitoring record is obtained to the temperature of the sunny slope of reference plate.
B step, Real-Time Monitoring (can be measured by conventional thermometry, for example use thermal resistance to measure, for example, every temperature data of 10 minutes survey records) record obtains R Cable Structure surface temperature measured data of above-mentioned R Cable Structure surface point, Real-Time Monitoring (can be measured by conventional thermometry simultaneously, for example use thermal resistance to measure, for example, every temperature data of 10 minutes survey records) obtain previously defined Cable Structure along the temperature profile data of thickness, Real-Time Monitoring (can be measured by conventional thermometry simultaneously, for example in the wooden thermometer screen that meets meteorology temperature measurement requirement, lay thermal resistance and measure temperature, for example, every temperature data of 10 minutes survey records) record obtains meeting the temperature record that meteorology is measured the Cable Structure place environment of temperature requirement, by Real-Time Monitoring, (can measure by conventional thermometry, for example in the wooden thermometer screen that meets meteorology temperature measurement requirement, lay thermal resistance and measure temperature, for example, every temperature data of 10 minutes survey records) record obtains being carved at sunrise the sunrise next day temperature measured data sequence of the Cable Structure place environment between latter 30 minutes constantly the same day, the temperature measured data sequence of Cable Structure place environment is arranged according to time order and function order by the temperature measured data that was carved at sunrise the Cable Structure place environment between latter 30 minutes of the moment of sunrise next day the same day, find maximum temperature and minimum temperature in the temperature measured data sequence of Cable Structure place environment, by the maximum temperature in the temperature measured data sequence of Cable Structure place environment, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day that minimum temperature obtains Cable Structure place environment, be designated as Δ T emax, temperature measured data sequence by Cable Structure place environment (for example first carries out curve fitting to the temperature measured data sequence of Cable Structure place environment by conventional mathematical computations, then by asking curve to the derivative of time or by ask the rate of change of each point corresponding to survey record data time to the time on curve by numerical method) obtain the temperature of Cable Structure place environment about the rate of change of time, this rate of change is also along with the time changes, by Real-Time Monitoring, (can measure by conventional thermometry, for example use the temperature of the dull and stereotyped sunny slope of thermal resistance witness mark, for example, every temperature data of 10 minutes survey records) obtain being carved at sunrise the same day sunrise next day measured data sequence of the temperature of the sunny slope of the reference plate between latter 30 minutes constantly, the measured data sequence of the temperature of the sunny slope of reference plate by be carved at sunrise the same day next day sunrise constantly the measured data of the temperature of the sunny slope of the reference plate between latter 30 minutes according to time order and function order, arrange, find maximum temperature and minimum temperature in the measured data sequence of temperature of sunny slope of reference plate, by the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day of temperature that minimum temperature obtains the sunny slope of reference plate, be designated as Δ T pmax, by Real-Time Monitoring, (can measure by conventional thermometry, for example use thermal resistance to measure Cable Structure surface point, for example, every temperature data of 10 minutes survey records) record obtains being carved at sunrise the sunrise next day Cable Structure surface temperature measured data sequence of all R Cable Structure surface points between latter 30 minutes constantly the same day, there is R Cable Structure surface point just to have R Cable Structure surface temperature measured data sequence, each Cable Structure surface temperature measured data sequence by be carved at sunrise on same day of a Cable Structure surface point sunrise next day constantly the Cable Structure surface temperature measured data between latter 30 minutes according to time order and function order, arrange, find maximum temperature and minimum temperature in each Cable Structure surface temperature measured data sequence, by the maximum temperature in each Cable Structure surface temperature measured data sequence, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day that minimum temperature obtains the temperature of each Cable Structure surface point, there is R Cable Structure surface point just to have and be carved at sunrise the sunrise next day maximum temperature difference numerical value between latter 30 minutes constantly R the same day, maximal value is wherein designated as Δ T smax, by each Cable Structure surface temperature measured data sequence, by conventional mathematical computations, (for example first each Cable Structure surface temperature measured data sequence is carried out curve fitting, then by asking curve to the derivative of time or by ask the rate of change of each point corresponding to survey record data time to the time on curve by numerical method) obtain the temperature of each Cable Structure surface point about the rate of change of time, the temperature of each Cable Structure surface point about the rate of change of time also along with the time changes.By Real-Time Monitoring, obtain being carved at sunrise the same day between latter 30 minutes of the moment of sunrise next day, at synchronization, after HBE " Cable Structure is along the temperature profile data of thickness ", the sea level elevation place that calculating is chosen at each amounts to maximum temperature in BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " and the difference of minimum temperature, the absolute value of this difference is called " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", chosen H different sea level elevation and just had H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", claim that the maximal value in this H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference " is " Cable Structure thickness direction maximum temperature difference ", be designated as Δ T tmax.
C step, measures and calculates acquisition Cable Structure steady temperature data; First, determine the moment that obtains Cable Structure steady temperature data, the condition relevant to the moment that determines acquisition Cable Structure steady temperature data has six, first condition is the moment that obtains Cable Structure steady temperature data to be carved at sunset sunrise next day constantly between latter 30 minutes between the same day, sunset refers to sunset on base area revolutions and the definite meteorology of revolution rule constantly constantly, and the sunset that can inquire about data or calculate each required day by conventional meteorology constantly; The a condition of second condition be the same day be carved at sunrise next day sunrise constantly between latter 30 minutes during this period of time in, Δ T pmaxwith Δ T smaxall be not more than 5 degrees Celsius; Second must be satisfied b condition be the same day be carved at sunrise next day sunrise constantly between latter 30 minutes during this period of time in, above, measure the Δ T calculating emaxbe not more than with reference to temperature difference per day Δ T r, and above, measure the Δ T calculating pmaxdeduct 2 degrees Celsius and be not more than Δ T emax, and above, measure the Δ T calculating smaxbe not more than Δ T pmax; Only needing to meet in a condition of second and b condition one is just called and meets second condition; The 3rd condition is that the temperature of Cable Structure place environment is not more than 0.1 degree Celsius per hour about the absolute value of the rate of change of time in the moment that obtains Cable Structure steady temperature data; The 4th condition is that the temperature of each the Cable Structure surface point in R Cable Structure surface point is not more than 0.1 degree Celsius per hour about the absolute value of the rate of change of time in the moment that obtains Cable Structure steady temperature data; The 5th condition is in the moment that obtains Cable Structure steady temperature data, and the Cable Structure surface temperature measured data of each the Cable Structure surface point in R Cable Structure surface point is to be carved at sunrise the sunrise next day minimal value between latter 30 minutes constantly the same day; The 6th condition is at the moment that obtains Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T tmaxbe not more than 1 degree Celsius.This method is utilized above-mentioned six conditions, any one in following three kinds of moment is called to " obtaining the mathematics of Cable Structure steady temperature data constantly ", the first is first moment to the 5th condition meeting in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, the second is the moment that only meets the 6th condition in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, the third is first moment to the 6th condition simultaneously meeting in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, when obtaining the mathematics of Cable Structure steady temperature data, be exactly in this method during in constantly one of physical record data constantly, the moment that obtains Cable Structure steady temperature data be exactly obtain Cable Structure steady temperature data mathematics constantly, if obtain the mathematics of Cable Structure steady temperature data and be not constantly any in constantly of physical record data in this method constantly, get this method close to moment of the mathematics that obtains Cable Structure steady temperature data those physical record data constantly for obtaining the moment of Cable Structure steady temperature data, this method is carried out the relevant health monitoring analysis of Cable Structure by using in the amount that obtains the moment survey record of Cable Structure steady temperature data, this method is approximate thinks that the Cable Structure temperature field in moment of obtaining Cable Structure steady temperature data is in stable state, i.e. this Cable Structure temperature constantly temporal evolution not, and this is exactly the moment of the acquisition Cable Structure steady temperature data of this method constantly, then, according to Cable Structure heat transfer characteristic, utilize to obtain R Cable Structure surface temperature measured data and " HBE Cable Structure is along thickness temperature measured data " in the moment of Cable Structure steady temperature data, utilize the thermal conduction study computation model (for example finite element model) of Cable Structure, for example, by conventional Calculation of Heat Transfer (finite element method), obtain in the Temperature Distribution of Cable Structure that obtains the moment of Cable Structure steady temperature data, now calculate by stable state in the temperature field of Cable Structure, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculating comprises the accounting temperature of R Cable Structure surface point in Cable Structure, the accounting temperature of R Cable Structure surface point is called R Cable Structure stable state surface temperature computational data, also comprise that Cable Structure is in the accounting temperature of selected HBE " measuring Cable Structure along the point of the temperature profile data of thickness " above, the accounting temperature of HBE " measuring Cable Structure along the point of the temperature profile data of thickness " is called " HBE Cable Structure is along thickness temperature computation data ", when R Cable Structure surface temperature measured data and R Cable Structure stable state surface temperature computational data correspondent equal, and when " HBE Cable Structure is along thickness temperature measured data " and " HBE Cable Structure is along thickness temperature computation data " correspondent equal, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculating is called " Cable Structure steady temperature data " in the method, " R Cable Structure surface temperature measured data " is now called " R Cable Structure stable state surface temperature measured data ", " HBE Cable Structure is along thickness temperature measured data " is called " HBE Cable Structure is along thickness steady temperature measured data ".While getting " R Cable Structure surface point " on the surface of Cable Structure, the quantity of " R Cable Structure surface point " and necessary three conditions that meet that distribute, first condition is when Cable Structure temperature field is during in stable state, on Cable Structure surface the temperature of any point be by " R Cable Structure surface point " with Cable Structure surface on the observed temperature linear interpolation of the adjacent point in this arbitrfary point while obtaining, on the Cable Structure surface that linear interpolation obtains, on the temperature of this arbitrfary point and Cable Structure surface, the error of the actual temperature of this arbitrfary point is not more than 5%; Cable Structure surface comprises support cable surface; Second condition is that in " R Cable Structure surface point ", the quantity at the point of same sea level elevation is not less than 4, and uniform along Cable Structure surface at the point of same sea level elevation in " R Cable Structure surface point "; " R Cable Structure surface point " is not more than 0.2 ℃ divided by Δ T along the maximal value Δ h in the absolute value of all differences of the sea level elevation of adjacent Cable Structure surface point between two of sea level elevation hthe numerical value obtaining, gets Δ T for convenience of narration hunit be ℃/m that the unit of getting Δ h for convenience of narration is m; " R Cable Structure surface point " refers to while only considering sea level elevation along the definition of adjacent Cable Structure surface point between two of sea level elevation, in " R Cable Structure surface point ", do not have a Cable Structure surface point, the sea level elevation numerical value of this Cable Structure surface point is between the sea level elevation numerical value of adjacent Cable Structure surface point between two; The 3rd condition is inquiry or obtains the rule at sunshine between Cable Structure location and Altitude Region, place by meteorology conventionally calculation, again according to the geometric properties of Cable Structure and bearing data, in Cable Structure, find and be subject to the sunshine-duration position of those surface points the most fully the whole year, in " R Cable Structure surface point ", having a Cable Structure surface point at least is the annual point being subject in the most sufficient those surface points of sunshine-duration in Cable Structure.
Second step: set up initial mechanical calculating benchmark model A o.
In Cable Structure completion, or before setting up health monitoring systems, according to " the temperature survey calculating method of the Cable Structure of this method " measurement, calculating " Cable Structure steady temperature data " (can measure by conventional thermometry, for example use thermal resistance to measure), " Cable Structure steady temperature data " now use vector T orepresent, be called initial Cable Structure steady temperature data vector T o.In actual measurement, obtain T otime, namely at the synchronization that obtains the moment of initial Cable Structure steady temperature data vector, use conventional method directly to measure the initial value of all monitored amounts that calculate Cable Structure, form monitored amount initial value vector C o.
Can be specifically in this method according to following method at the synchronization that obtains the moment of so-and-so (such as initial or current etc.) Cable Structure steady temperature data vector, use so-and-so method measurement to calculate the data of the monitored amount of so-and-so measured amount (for example all monitored amount of Cable Structure): at the survey record temperature (temperature that comprises Cable Structure place environment, the temperature of the sunny slope of reference plate and Cable Structure surface temperature) time, for example, every temperature of 10 minutes survey records, so simultaneously equally also every 10 minutes the monitored amount of so-and-so measured amount of survey record (for example all monitored amount of Cable Structure) data.Once determine the moment that obtains Cable Structure steady temperature data, for example, be just called at the synchronization that obtains the moment of Cable Structure steady temperature data with the data of the monitored amount of so-and-so measured amount (all monitored amount of Cable Structure) that obtain the moment synchronization of Cable Structure steady temperature data so, use so-and-so method to measure the data of the monitored amount of so-and-so measured amount that computing method obtain.
Use conventional method (consult reference materials or survey) to obtain temperature variant physical parameter (for example thermal expansivity) and the mechanical property parameters (for example elastic modulus, Poisson ratio) of the various materials that Cable Structure used.
At Actual measurement, obtain initial Cable Structure steady temperature data vector T otime, use conventional method Actual measurement to obtain the Actual measurement data of Cable Structure.The Actual measurement data of Cable Structure comprise that Non-destructive Testing Data of support cable etc. can express the data of the health status of rope, the initial geometric data of Cable Structure, rope force data, draw-bar pull data, initial Cable Structure bearing generalized coordinate data (comprise that bearing is about Descartes's rectangular coordinate system X, Y, the volume coordinate of Z axis and angular coordinate are initial Cable Structure bearing spatial data and initial Cable Structure bearing angular data), Cable Structure centre-point load measurement data, Cable Structure distributed load measurement data, Cable Structure volume load measurement data, Cable Structure modal data, structural strain data, structure angle measurement data, the measured datas such as structure space measurement of coordinates data.Initial Cable Structure bearing generalized coordinate data form initial Cable Structure bearing generalized coordinate vector U o.The initial geometric data of Cable Structure can be the spatial data that the spatial data of the end points of all ropes adds a series of point in structure, and object is to determine according to these coordinate datas the geometric properties of Cable Structure.For cable-stayed bridge, the spatial data that initial geometric data can be the end points of all ropes adds the spatial data of some points on bridge two ends, so-called bridge type data that Here it is.Data and the Cable Structure centre-point load measurement data of utilizing the Non-destructive Testing Data etc. of support cable can express the health status of support cable are set up evaluation object initial damage vector d o, use d orepresent that Cable Structure is (with initial mechanical calculating benchmark model A othe initial health of evaluation object expression).If while there is no the Non-destructive Testing Data of support cable and the data of other health status that can express support cable, or can think that structure original state is not damaged during without relaxed state, vectorial d oin each element numerical value relevant to support cable get 0, if d oevaluation object corresponding to some elements be some centre-point load, in this method, get d othis element numerical value be 0, the initial value that represents the variation of this centre-point load is 0.Utilize the design drawing, as-constructed drawing of Cable Structure and the initial measured data of Cable Structure, temperature variant physical and mechanical properties parameter, the initial Cable Structure bearing generalized coordinate vector U of the various materials that the Non-destructive Testing Data of support cable, Cable Structure are used owith initial Cable Structure steady temperature data vector T o, utilize mechanics method (for example finite element method) to count " Cable Structure steady temperature data " and set up initial mechanical calculating benchmark model A o.
No matter which kind of method to obtain initial mechanical calculating benchmark model A by o, counting " Cable Structure steady temperature data " (is initial Cable Structure steady temperature data vector T o), based on A othe Cable Structure computational data calculating must approach its measured data very much, and error generally must not be greater than 5%.Like this can utility A ocalculate Suo Li computational data, strain computational data, Cable Structure shape computational data and displacement computational data under the analog case of gained, Cable Structure angle-data, Cable Structure spatial data etc., the measured data when approaching reliably institute's analog case and truly occurring.Model A oevaluation object initial damage vector d for the health status of middle support cable orepresent initial Cable Structure steady temperature data vector T for Cable Structure steady temperature data orepresent.Due to based on A othe evaluation that calculates all monitored amounts approaches the initial value (actual measurement obtains) of all monitored amounts very much, so also can be used in A obasis on, carry out Mechanics Calculation obtains, A othe evaluation of each monitored amount form monitored amount initial value vector C o.Corresponding to A o" Cable Structure steady temperature data " be exactly " initial Cable Structure steady temperature data vector T o"; Corresponding to A oevaluation object initial damage vector d for evaluation object health status orepresent; Corresponding to A omonitored amount initial value vector C for the initial value of all monitored amounts orepresent.Corresponding to A oinitial Cable Structure bearing generalized coordinate vector U for Cable Structure bearing generalized coordinate data orepresent; T o, U oand d oa oparameter, C oby A omechanics Calculation result form.
The 3rd step: in the method, alphabetical i, except representing that significantly, the place of number of steps, alphabetical i only represents cycle index, circulates for the i time; When the i time circulation starts, the current initial mechanical calculating benchmark model of Cable Structure that need to set up or that set up is designated as current initial mechanical calculating benchmark model A i o, A oand A i ocount temperature parameter, can accounting temperature change the Effect on Mechanical Properties to Cable Structure; When the i time circulation starts, corresponding to A i o" Cable Structure steady temperature data " with current initial Cable Structure steady temperature data vector T i orepresent vector T i odefinition mode and vector T odefinition mode identical, T i oelement and T oelement corresponding one by one; That the i time circulation needs while starting, corresponding to the current initial mechanical calculating benchmark model A of Cable Structure i ocable Structure bearing generalized coordinate data form current initial Cable Structure bearing generalized coordinate vector U i o, set up for the first time the current initial mechanical calculating benchmark model A of Cable Structure i otime, U i ojust equal U o.The current initial damage vector of evaluation object that the i time circulation needs while starting is designated as d i o, d i ocable Structure A while representing this circulation beginning i othe health status of evaluation object, d i odefinition mode and d odefinition mode identical, d i oelement and d oelement corresponding one by one; When the i time circulation starts, the initial value of all monitored amounts, with the current initial value vector of monitored amount C i orepresent vectorial C i odefinition mode and vectorial C odefinition mode identical, C i oelement and C oelement corresponding one by one, the current initial value vector of monitored amount C i oexpression is corresponding to A i othe concrete numerical value of all monitored amounts; T i oand d i oa i ocharacterisitic parameter; C i oby A i omechanics Calculation result form; When circulation starts for the first time, A i obe designated as A 1 o, set up A 1 omethod for making A 1 oequal A o; When circulation starts for the first time, T i obe designated as T 1 o, set up T 1 omethod for making T 1 oequal T o; When circulation starts for the first time, U i obe designated as U 1 o, set up U 1 omethod for making U 1 oequal U o; When circulation starts for the first time, d i obe designated as d 1 o, set up d 1 omethod for making d 1 oequal d o; When circulation starts for the first time, C i obe designated as C 1 o, set up C 1 omethod for making C 1 oequal C o.
The 4th step: the hardware components of pass line structural healthy monitoring system.Hardware components at least comprises: monitored amount monitoring system (such as containing strain measurement system, signal conditioner etc.), Cable Structure bearing generalized coordinate monitoring system (containing total powerstation, angle measuring sensor, signal conditioner etc.), Cable Structure temperature monitoring system (containing temperature sensor, signal conditioner etc.) and Cable Structure ambient temperature measurement system (containing temperature sensor, signal conditioner etc.), signal (data) collector, computing machine and the panalarm of communicating by letter.Each bearing generalized coordinate, each temperature of each monitored amount, Cable Structure must arrive by monitored system monitoring, and monitoring system is transferred to signal (data) collector by the signal monitoring; Signal is delivered to computing machine through signal picker; Computing machine is responsible for the health monitoring software of the evaluation object of operation Cable Structure, comprises the signal that the transmission of tracer signal collector comes; When monitoring evaluation object health status and change, computer control communication panalarm to monitor staff, owner and (or) personnel of appointment report to the police.
The 5th step: establishment the system software of installation and operation this method on computers, this software will complete the functions (being all work that can complete with computing machine in this specific implementation method) such as monitoring that this method required by task wants, record, control, storage, calculating, notice, warning.
The 6th step: step starts circulation running thus, in structure military service process, according to " the temperature survey calculating method of the Cable Structure of this method " continuous Actual measurement, obtain the current data of Cable Structure steady temperature data, the current data of all " Cable Structure steady temperature data " forms current cable structure steady temperature data vector T i, vector T idefinition mode and vector T odefinition mode identical, T ielement and T oelement corresponding one by one; In actual measurement vector T itime, namely obtaining current cable structure steady temperature data vector T ithe synchronization in the moment, actual measurement obtains the currency of all monitored amounts in Cable Structure, all these numerical value form monitored amount current value vector C i, vectorial C idefinition mode and vectorial C odefinition mode identical, C ielement and C oelement corresponding one by one, represent that identical monitored amount is at numerical value in the same time not.
In actual measurement, obtain current cable structure steady temperature data vector T itime, actual measurement obtains Cable Structure bearing generalized coordinate current data, and all data form current cable structure actual measurement bearing generalized coordinate vector U i.
The 7th step: obtaining current cable structure actual measurement bearing generalized coordinate vector U iwith current cable structure steady temperature data vector T iafter, compare respectively U iand U i o, T iand T i oif, U iequal U i oand T iequal T i o, do not need A i o, U i oand T i oupgrade, otherwise need to be to current initial mechanical calculating benchmark model A i o, current initial Cable Structure bearing generalized coordinate vector U i o, current initial Cable Structure steady temperature data vector T i owith the current initial value vector of monitored amount C i oupgrade, and the current initial damage vector of evaluation object d i oremain unchanged, update method follows these steps to a and carries out to step c:
A. calculate U iwith U opoor, U iwith U odifference be exactly Cable Structure bearing about the generalized displacement of support of initial position, with generalized displacement of support vector V, represent generalized displacement of support, V equals U ideduct U o, between the element in generalized displacement of support vector V and generalized displacement of support component, be one-to-one relationship, in generalized displacement of support vector V, the numerical value of an element is corresponding to the generalized displacement of an assigned direction of an appointment bearing.
B. calculate T iwith T opoor, T iwith T odifference be exactly that current cable structure steady temperature data are about the variation of initial Cable Structure steady temperature data, T iwith T opoor with steady temperature change vector S, represent, S equals T ideduct T o, S represents the variation of Cable Structure steady temperature data.
C. first to A oin Cable Structure bearing apply generalized displacement of support constraint, the numerical value of generalized displacement of support constraint is just taken from the numerical value of corresponding element in generalized displacement of support vector V, then to A oin Cable Structure apply temperature variation, the numerical value of the temperature variation applying is just taken from steady temperature change vector S, to A oin Cable Structure apply and obtain the current initial mechanical calculating benchmark model A that upgrades after temperature variation i o, upgrade A i otime, T i oall elements numerical value is also used T icorresponding replacement of all elements numerical value, upgraded T i o, so just obtained correctly corresponding to A i ot i o; D now i oremain unchanged; When upgrading A i oafter, A i othe current initial damage of the cable system vector d for health status of rope i orepresent A i ocurrent cable structure steady temperature data vector T for Cable Structure steady temperature irepresent A i ocurrent initial Cable Structure bearing generalized coordinate vector U for bearing generalized coordinate i orepresent.Upgrade C i omethod be: when upgrading A i oafter, A i othe current initial damage of the evaluation object vector d for health status of evaluation object i orepresent A i ocurrent cable structure steady temperature data vector T for Cable Structure steady temperature irepresent A i ocurrent initial Cable Structure bearing generalized coordinate vector U for bearing generalized coordinate i orepresent, upgrade C i omethod be: when upgrading A i oafter, by Mechanics Calculation, obtain A i oin concrete numerical value all monitored amounts, current, these concrete numerical value form C i o;
The 8th step: at current initial mechanical calculating benchmark model A i obasis on, according to step a, to steps d, carry out several times Mechanics Calculation, by calculating, set up unit damage monitored numerical quantity transformation matrices Δ C iwith evaluation object unit change vector D i u.
A. when the i time circulation starts, directly press step b to the listed method acquisition of steps d Δ C iand D i u; At other constantly, when in the 7th step to A i oafter upgrading, must regain Δ C to the listed method of steps d by step b iand D i uif, in the 7th step not to A i oupgrade, directly proceed to herein the 9th step and carry out follow-up work.
B. at current initial mechanical calculating benchmark model A i obasis on carry out several times Mechanics Calculation, vectorial d i orepresent A i othe health status of evaluation object, on calculation times numerical value, equal the quantity N of all evaluation objects, have N evaluation object just to have N calculating; Calculate each time hypothesis and only have an evaluation object at vectorial d i oon the basis of the health status of the evaluation object representing, there is unit damage or centre-point load unit change, concrete, if this evaluation object is a support cable in cable system, so just suppose that this support cable is at vectorial d i oon the basis of the existing damage of this support cable representing, there is again unit damage (for example getting 5%, 10%, 20% or 30% equivalent damage is unit damage), if this evaluation object is a centre-point load, just suppose that this centre-point load is at vectorial d i o(if this centre-point load is couple, centre-point load unit change can be got 1kNm, 2kNm, 3kNm etc. for unit change on the basis of the existing variable quantity of this centre-point load representing, to increase centre-point load unit change again; If this centre-point load is concentrated force, centre-point load unit change can be got 1kN, 2kN, 3kN etc. for unit change), use D i ukrecord this unit damage or centre-point load unit change, wherein k represents to occur the numbering of the evaluation object of unit damage or centre-point load unit change, D i ukevaluation object unit change vector D i uan element, evaluation object unit change vector D i ucoding rule and the vectorial d of element othe coding rule of element identical; The evaluation object that occurs unit damage or centre-point load unit change in calculating is each time different from the evaluation object that occurs unit damage or centre-point load unit change in other calculating, calculate each time the current calculated value that all utilizes mechanics method to calculate all monitored amounts of Cable Structure, the current calculated value of all monitored amounts that calculate each time forms a monitored amount calculation current vector; When k evaluation object of hypothesis has unit damage or centre-point load unit change, available C i tkrepresent corresponding " monitored amount calculation current vector "; While giving in this step each vectorial element numbering, should use same coding rule with other vector in this method, to guarantee any one element in each vector in this step, with in other vector, number identical element, expressed the relevant information of same monitored amount or same target; C i tkdefinition mode and vectorial C odefinition mode identical, C i tkelement and C oelement corresponding one by one.
C. the vectorial C calculating each time i tkdeduct vectorial C i oobtain a vector, then unit damage or the centre-point load unit change numerical value D of supposition during each element of this vector is calculated divided by this i ukafter obtain " the numerical value change of a monitored amount vector δ C i k"; There is N evaluation object just to have N " the numerical value change vector of monitored amount ".
D. by this N " the numerical value change vector of monitored amount ", according to the coding rule of N evaluation object, form successively " the unit damage monitored numerical quantity transformation matrices Δ C that has N row i"; Unit damage monitored numerical quantity transformation matrices Δ C ieach row corresponding to a monitored amount unit change vector; Unit damage monitored numerical quantity transformation matrices Δ C ievery a line corresponding to same monitored amount the different unit change amplitude when different evaluation objects increase unit damage or centre-point load unit change; Unit damage monitored numerical quantity transformation matrices Δ C icoding rule and the vectorial d of row othe coding rule of element identical, unit damage monitored numerical quantity transformation matrices Δ C ithe coding rule of coding rule and M monitored amount of row identical.
The 9th step: set up linear relationship error vector e iwith vectorial g i.Utilize data (" the current initial value vector of monitored amount C above i o", " unit damage monitored numerical quantity transformation matrices Δ C i"); when the 8th step is calculated each time; when only having the increase unit damage or centre-point load unit change of an evaluation object in calculating each time hypothesis evaluation object; when hypothesis k(k=1,2,3; ..., when N) individual evaluation object increases unit damage or centre-point load unit change, calculate each time and form a damage vector, use d i tkrepresent this damage vector, corresponding monitored amount calculation current vector is C i tk(referring to the 8th step), damages vectorial d i tkelement number equal the quantity of evaluation object, vectorial d i tkall elements in only have the numerical value of an element to get to calculate each time in hypothesis increase unit damage or the centre-point load unit change value of the evaluation object of unit damage or centre-point load unit change, d i tkthe numerical value of other element get 0, that is not the numbering of 0 element and corresponding relation that supposition increases the evaluation object of unit damage or centre-point load unit change, with the element of the same numbering of other vectors, with the corresponding relation of this evaluation object, is identical; d i tkwith evaluation object initial damage vector d oelement coding rule identical, d i tkelement and d oelement be one-to-one relationship.By C i tk, C i o, Δ C i, d i tkbring formula (23) into, obtain a linear relationship error vector e i k, calculate each time a linear relationship error vector e i k; e i ksubscript k represent k(k=1,2,3 ..., N) individual evaluation object increases unit damage or centre-point load unit change.There is N evaluation object just to have N calculating, just have N linear relationship error vector e i k, by this N linear relationship error vector e i kafter addition, obtain a vector, the new vector that each element of this vector is obtained after divided by N is exactly final linear relationship error vector e i.Vector g iequal final error vector e i.By vectorial g ibe kept on the hard disc of computer of operation health monitoring systems software, for health monitoring systems software application.
e k i = abs ( Δ C i · d tk i - C tk i + C o i ) - - - ( 23 )
The tenth step: define the vectorial d of current name damage i cwith current actual damage vector d i, d i cand d ielement number equal the quantity of evaluation object, d i cand d ielement and evaluation object between be one-to-one relationship, d i cand d ielement numerical value represent degree of injury or the centre-point load intensity of variation of corresponding evaluation object, d i cand d iwith evaluation object initial damage vector d oelement coding rule identical, d i celement, d ielement and d oelement be one-to-one relationship.
The 11 step: according to monitored amount current value vector C iwith " the current initial value vector of monitored amount C i o", " unit damage monitored numerical quantity transformation matrices Δ C i" and " the vectorial d of current name damage i c" between the linear approximate relationship that exists, this linear approximate relationship can be expressed as formula (11), according to multi-objective optimization algorithm, calculates the vectorial d of current name damage i cnoninferior solution, namely with reasonable error but can be more exactly determine the position of damaged cable and the solution of nominal degree of injury thereof from all ropes.
The multi-objective optimization algorithm that can adopt has a variety of, for example: the multiple-objection optimization based on genetic algorithm, the multiple-objection optimization based on artificial neural network, the multi-objective optimization algorithm based on population, the multiple-objection optimization based on ant group algorithm, leash law (Constrain Method), weighted method (Weighted SUm Method), Objective Programming (Goal Attainment Method) etc.Because various multi-objective optimization algorithms are all conventional algorithms, can realize easily, this implementation step only be take Objective Programming and as example provides, is solved the vectorial d of current name damage i cprocess, the specific implementation process of other algorithm can realize in a similar fashion according to the requirement of its specific algorithm.
According to Objective Programming, formula (11) can transform the multi-objective optimization question shown in an accepted way of doing sth (24) and formula (25), and in formula (24), γ is a real number, and R is real number field, and area of space Ω has limited vectorial d i cspan (the present embodiment requirements vector d of each element i ceach element be not less than 0, be not more than 1).The meaning of formula (24) is to find a minimum real number γ, and formula (25) is met.G (d in formula (25) i c) by formula (25) definition, G (d in the product representation formula (25) of weighing vector W and γ in formula (25) i c) and vectorial g ibetween the deviation that allows, g idefinition referring to formula (17), its value calculates in the 9th step.During actual computation vector W can with vectorial g iidentical.The concrete programming of Objective Programming realizes has had universal program directly to adopt.Use Objective Programming just can damage vectorial d in the hope of current name i c.
min imize γ γ ∈ R , d c i ∈ Ω - - - ( 24 )
G ( d c i ) - Wγ ≤ g i - - - ( 25 )
G ( d c i ) = abs ( Δ C i · d c i - C i + C o i ) - - - ( 26 )
The 12 step: according to the current actual damage vector of cable system d idefinition (seeing formula (18)) and the definition (seeing formula (19)) of its element calculate current actual damage vector d ieach element, thereby can be by d idetermine the health status of evaluation object.Current actual damage vector d ik element d i kthe current actual health status that represents k evaluation object in the i time circulation.
D i kthe current actual health status that represents k evaluation object in the i time circulation, if this evaluation object is support cable, so a d in cable system i krepresent its current actual damage, d i kbe to represent not damaged at 0 o'clock, while being 100%, represent that this support cable thoroughly loses load-bearing capacity, in the time of between 0 and 100%, represent to lose the load-bearing capacity of corresponding proportion.
D i kthe current actual health status that represents k evaluation object in the i time circulation, if this evaluation object is centre-point load, so a d i krepresent that its current actual centre-point load changes numerical value, so according to the current actual damage vector of evaluation object d ican define the impaired and degree of injury of which support cable, define which centre-point load variation and numerical value thereof have occurred.
So far, can say that this method has realized two kinds of functions that existing method can not possess, be respectively, when the centre-point load of one, bearing when bearing has generalized displacement, in structure and structure (environment) temperature changes simultaneously, can reject generalized displacement of support, centre-point load variation and structure temperature and change the impact on Cable Structure health status recognition result, thereby identify exactly the structure health monitoring method of damaged cable; Two, this method is when identifying damaged cable, can also identify the variation of centre-point load simultaneously, be that this method can be rejected generalized displacement of support, structure temperature changes and the impact of support cable health status variation, realize the correct identification of centre-point load intensity of variation.
The 13 step: the computing machine in health monitoring systems regularly generates cable system health condition form automatically or by personnel's operational health monitoring system.
The 14 step: under specified requirements, computing machine automatic operation in health monitoring systems communication panalarm to monitor staff, owner and (or) personnel of appointment report to the police.
The 15 step: set up mark vector B according to formula (20) i, formula (21) has provided mark vector B ithe definition of k element; If mark vector B ielement be 0 entirely, get back to the 6th step and proceed the health monitoring of cable system and calculating; If mark vector B ielement be not 0 entirely, complete after subsequent step, enter next time circulation.
The 16 step: according to formula (22) calculate next time (the i+1 time, i=1,2,3,4 ...) circulate initial damage vector d required i+1 oeach element d i+1 ok(k=1,2,3 ..., N); The second, at initial mechanical calculating benchmark model A obasis on, first to A oin Cable Structure bearing apply generalized displacement of support constraint, the numerical value of generalized displacement of support constraint is just taken from the numerical value of corresponding element in generalized displacement of support vector V, then to A oin Cable Structure apply temperature variation, the numerical value of the temperature variation applying is just taken from steady temperature change vector S, then to make the health status of rope be d i+1 oafter obtain be exactly next time, the i+1 time (i=1,2,3,4 ...) circulate Mechanics Calculation benchmark model A required i+1; Next time (the i+1 time, i=1,2,3,4 ...) required current initial Cable Structure steady temperature data vector T circulates i+1 oequal T i o, next time (the i+1 time, i=1,2,3,4 ...) required current initial Cable Structure bearing generalized coordinate vector U circulates i+1 oequal U i o.Obtain A i+1, d i+1 o, U i+1 oand T i+1 oafter, by Mechanics Calculation, obtain A i+1in concrete numerical value all monitored amounts, current, these concrete numerical value form next time, the vectorial C of the current initial value of required monitored amount that circulates for the i+1 time i+1 o.
The 17 step: get back to the 6th step, start the circulation by the 6th step to the 17 steps.

Claims (1)

1. the laddering recognition methods of generalized displacement strain monitoring damaged cable centre-point load, is characterized in that described method comprises:
A. for sake of convenience, it is evaluation object that this method unitedly calls evaluated support cable and centre-point load, establishes the quantity of evaluated support cable and the quantity sum of centre-point load is N, and the quantity of evaluation object is N; Determine the coding rule of evaluation object, by this rule, by evaluation object numberings all in Cable Structure, this numbering will be for generating vector sum matrix in subsequent step; This method represents this numbering with variable k, k=1, and 2,3 ..., N; Determine the point being monitored of appointment, point being monitored characterizes all specified points of Cable Structure strain information, and gives all specified point numberings; Determine monitored should the changing direction of point being monitored, and number to the monitored strain of all appointments, " monitored strain numbering " will be for generating vector sum matrix in subsequent step, and " the whole monitored strain data of Cable Structure " is comprised of above-mentioned all monitored strains; This method by " the monitored strain data of Cable Structure " referred to as " monitored amount "; The quantity sum of all monitored amounts is designated as M, and M must not be less than N; In this method, to the time interval between any twice measurement of same amount Real-Time Monitoring, must not be greater than 30 minutes, the moment of survey record data is called physical record data constantly;
B. this method definition " the temperature survey calculating method of the Cable Structure of this method " is undertaken by step b1 to b3;
B1: inquiry or actual measurement obtain the temperature variant thermal conduction study parameter of Cable Structure composition material and Cable Structure environment of living in, utilize the geometry measured data of design drawing, as-constructed drawing and the Cable Structure of Cable Structure, utilize these data and parameter to set up the thermal conduction study computation model of Cable Structure, inquiry Cable Structure location is no less than the meteorological data in recent years of 2 years, statistics obtains interior during this period of time cloudy quantity and is designated as T cloudy day, in the method can not be seen to one of the sun daytime and be called all day the cloudy day, statistics obtains 0 highest temperature and the lowest temperature between latter 30 minutes of the moment of sunrise next day at each cloudy day in T cloudy day, sunrise on the meteorology that sunrise refers to base area revolutions constantly and the rule that revolves round the sun is definite constantly, do not represent necessarily can see the sun same day, the sunrise that can inquire about data or calculate each required day by conventional meteorology constantly, each cloudy day 0 up to next day sunrise constantly the highest temperature between latter 30 minutes deduct the maximum temperature difference that the lowest temperature is called this cloudy daily temperature, there is T cloudy day, the maximum temperature difference that just has the daily temperature at T cloudy day, get maximal value in the maximum temperature difference of daily temperature at T cloudy day for reference to temperature difference per day, with reference to temperature difference per day, be designated as Δ T r, between inquiry Cable Structure location and Altitude Region, place, be no less than temperature that the meteorological data in recent years of 2 years or actual measurement obtain Cable Structure environment of living in time with delta data and the Changing Pattern of sea level elevation, calculate the temperature of the Cable Structure environment of living in recent years that is no less than 2 years between Cable Structure location and Altitude Region, place about the maximum rate of change Δ T of sea level elevation h, for convenience of narration, get Δ T hunit be ℃/m, on the surface of Cable Structure, get " R Cable Structure surface point ", get the Specific Principles of " R Cable Structure surface point " narrates in step b3, after will by actual measurement, obtain the temperature of this R Cable Structure surface point, claim that the temperature data that actual measurement obtains is " R Cable Structure surface temperature measured data ", if utilize the thermal conduction study computation model of Cable Structure, by Calculation of Heat Transfer, obtain the temperature of this R Cable Structure surface point, just claim that the temperature data calculating is " R Cable Structure surface temperature computational data ", from the residing minimum height above sea level of Cable Structure to the highest height above sea level, in Cable Structure, uniform choosing is no less than three different sea level elevations, the sea level elevation place choosing at each, at the intersection place on surface level and Cable Structure surface, at least choose two points, outer normal from selected point straw line body structure surface, all outer normal directions of choosing are called " measuring Cable Structure along the direction of the Temperature Distribution of wall thickness ", measure Cable Structure crossing with " intersection on surface level and Cable Structure surface " along the direction of the Temperature Distribution of wall thickness, in the measurement Cable Structure of choosing along comprising the sunny slope outer normal direction of Cable Structure and in the shade outer normal direction of Cable Structure in the direction of the Temperature Distribution of wall thickness, direction uniform choosing in Cable Structure along each measurement Cable Structure along the Temperature Distribution of wall thickness is no less than three points, measure all temperature that are selected a little, the temperature recording is called " Cable Structure is along the temperature profile data of thickness ", wherein along crossing with same " intersection on surface level and Cable Structure surface ", " measure Cable Structure along the direction of the Temperature Distribution of wall thickness " and measure " Cable Structure is along the temperature profile data of thickness " that obtain, be called in the method " identical sea level elevation Cable Structure is along the temperature profile data of thickness ", if chosen H different sea level elevation, at each sea level elevation place, choose B and measured Cable Structure along the direction of the Temperature Distribution of wall thickness, along each, measure Cable Structure and in Cable Structure, chosen E point along the direction of the Temperature Distribution of wall thickness, wherein H and E are not less than 3, B is not less than 2, if HBE is the product of H and B and E, corresponding total HBE " measuring Cable Structure along the point of the temperature profile data of thickness ", after will obtain the temperature that this HBE " measures Cable Structure along the point of the temperature profile data of thickness " by actual measurement, claim that the temperature data that actual measurement obtains is " HBE Cable Structure is along thickness temperature measured data ", if utilize the thermal conduction study computation model of Cable Structure, by Calculation of Heat Transfer, obtain this HBE and measure Cable Structure along the temperature of the point of the temperature profile data of thickness, just claim that the temperature data calculating is " HBE Cable Structure is along thickness temperature computation data ", if BE is the product of B and E, total BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " in sea level elevation place of choosing at each in this method, in Cable Structure location, according to meteorology, measure temperature and require to choose a position, will obtain meeting the temperature that meteorology is measured the Cable Structure place environment of temperature requirement in this position actual measurement, in the on-site spaciousness of Cable Structure, unobstructed place chooses a position, this position should can obtain in each day of the whole year this ground the most sufficient sunshine of getable this day, flat board at a carbon steel material of this position of sound production, be called reference plate, reference plate can not contact with ground, reference plate overhead distance is not less than 1.5 meters, the one side of this reference plate on the sunny side, be called sunny slope, the sunny slope of reference plate is coarse and dark color, the sunny slope of reference plate should can obtain in each day of the whole year one flat plate on this ground the most sufficient sunshine of getable this day, the non-sunny slope of reference plate is covered with insulation material, Real-Time Monitoring is obtained to the temperature of the sunny slope of reference plate,
B2: Real-Time Monitoring obtains R Cable Structure surface temperature measured data of above-mentioned R Cable Structure surface point, Real-Time Monitoring obtains previously defined Cable Structure along the temperature profile data of thickness simultaneously, and Real-Time Monitoring obtains meeting the temperature record that meteorology is measured the Cable Structure place environment of temperature requirement simultaneously, by Real-Time Monitoring, obtain being carved at sunrise the same day sunrise next day temperature measured data sequence of the Cable Structure place environment between latter 30 minutes constantly, the temperature measured data sequence of Cable Structure place environment is arranged according to time order and function order by the temperature measured data that was carved at sunrise the Cable Structure place environment between latter 30 minutes of the moment of sunrise next day the same day, find maximum temperature and minimum temperature in the temperature measured data sequence of Cable Structure place environment, by the maximum temperature in the temperature measured data sequence of Cable Structure place environment, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day that minimum temperature obtains Cable Structure place environment, be called environment maximum temperature difference, be designated as Δ T emax, by the temperature measured data sequence of Cable Structure place environment, by conventional mathematical computations, obtain the temperature of Cable Structure place environment about the rate of change of time, this rate of change is also along with the time changes, by Real-Time Monitoring, obtain being carved at sunrise the same day sunrise next day measured data sequence of the temperature of the sunny slope of the reference plate between latter 30 minutes constantly, the measured data sequence of the temperature of the sunny slope of reference plate by be carved at sunrise the same day next day sunrise constantly the measured data of the temperature of the sunny slope of the reference plate between latter 30 minutes according to time order and function order, arrange, find maximum temperature and minimum temperature in the measured data sequence of temperature of sunny slope of reference plate, by the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day of temperature that minimum temperature obtains the sunny slope of reference plate, be called reference plate maximum temperature difference, be designated as Δ T pmax, by Real-Time Monitoring, obtain being carved at sunrise the same day sunrise next day Cable Structure surface temperature measured data sequence of all R Cable Structure surface points between latter 30 minutes constantly, there is R Cable Structure surface point just to have R Cable Structure surface temperature measured data sequence, each Cable Structure surface temperature measured data sequence by be carved at sunrise on same day of a Cable Structure surface point sunrise next day constantly the Cable Structure surface temperature measured data between latter 30 minutes according to time order and function order, arrange, find maximum temperature and minimum temperature in each Cable Structure surface temperature measured data sequence, by the maximum temperature in each Cable Structure surface temperature measured data sequence, deduct and be carved at sunrise the sunrise next day maximum temperature difference between latter 30 minutes constantly on same day that minimum temperature obtains the temperature of each Cable Structure surface point, there is R Cable Structure surface point just to have and be carved at sunrise the sunrise next day maximum temperature difference numerical value between latter 30 minutes constantly R the same day, maximal value is wherein called Cable Structure surface maximum temperature difference, be designated as Δ T smax, by each Cable Structure surface temperature measured data sequence, by conventional mathematical computations, obtain the temperature of each Cable Structure surface point about the rate of change of time, the temperature of each Cable Structure surface point about the rate of change of time also along with the time changes, by Real-Time Monitoring, obtain being carved at sunrise the same day between latter 30 minutes of the moment of sunrise next day, at synchronization, after HBE " Cable Structure is along the temperature profile data of thickness ", the sea level elevation place that calculating is chosen at each amounts to maximum temperature in BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " and the difference of minimum temperature, the absolute value of this difference is called " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", chosen H different sea level elevation and just had H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", claim that the maximal value in this H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference " is " Cable Structure thickness direction maximum temperature difference ", be designated as Δ T tmax,
B3: measure and calculate acquisition Cable Structure steady temperature data, first, determine the moment that obtains Cable Structure steady temperature data, the condition relevant to the moment that determines acquisition Cable Structure steady temperature data has six, first condition is the moment that obtains Cable Structure steady temperature data to be carved at sunset sunrise next day constantly between latter 30 minutes between the same day, sunset refers to sunset on base area revolutions and the definite meteorology of revolution rule constantly constantly, and the sunset that can inquire about data or calculate each required day by conventional meteorology constantly, the a condition of second condition be the same day be carved at sunrise next day sunrise constantly between latter 30 minutes during this period of time in, reference plate maximum temperature difference Δ T pmaxwith Cable Structure surface maximum temperature difference Δ T smaxall be not more than 5 degrees Celsius, the b condition of second condition be the same day be carved at sunrise next day sunrise constantly between latter 30 minutes during this period of time in, above, measure the environment maximum error Δ T calculating emaxbe not more than with reference to temperature difference per day Δ T r, and reference plate maximum temperature difference Δ T pmaxafter deducting 2 degrees Celsius, be not more than Δ T emax, and Cable Structure surface maximum temperature difference Δ T smaxbe not more than Δ T pmax, only needing to meet in a condition of second and b condition one is just called and meets second condition, the 3rd condition is that the temperature of Cable Structure place environment is not more than 0.1 degree Celsius per hour about the absolute value of the rate of change of time in the moment that obtains Cable Structure steady temperature data, the 4th condition is that the temperature of each the Cable Structure surface point in R Cable Structure surface point is not more than 0.1 degree Celsius per hour about the absolute value of the rate of change of time in the moment that obtains Cable Structure steady temperature data, the 5th condition is in the moment that obtains Cable Structure steady temperature data, and the Cable Structure surface temperature measured data of each the Cable Structure surface point in R Cable Structure surface point is to be carved at sunrise the sunrise next day minimal value between latter 30 minutes constantly the same day, the 6th condition is at the moment that obtains Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T tmaxbe not more than 1 degree Celsius, this method is utilized above-mentioned six conditions, any one in following three kinds of moment is called to " obtaining the mathematics of Cable Structure steady temperature data constantly ", the first is first moment to the 5th condition meeting in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, the second is the moment that only meets the 6th condition in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, the third is first moment to the 6th condition simultaneously meeting in above-mentioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data " constantly, when obtaining the mathematics of Cable Structure steady temperature data, be exactly in this method during in constantly one of physical record data constantly, the moment that obtains Cable Structure steady temperature data be exactly obtain Cable Structure steady temperature data mathematics constantly, if obtain the mathematics of Cable Structure steady temperature data and be not constantly any in constantly of physical record data in this method constantly, get this method close to moment of the mathematics that obtains Cable Structure steady temperature data those physical record data constantly for obtaining the moment of Cable Structure steady temperature data, this method is carried out the relevant health monitoring analysis of Cable Structure by using in the amount that obtains the moment survey record of Cable Structure steady temperature data, this method is approximate thinks that the Cable Structure temperature field in moment of obtaining Cable Structure steady temperature data is in stable state, i.e. this Cable Structure temperature constantly temporal evolution not, and this is exactly " obtaining the moment of Cable Structure steady temperature data " of this method constantly, then, according to Cable Structure heat transfer characteristic, utilize " R the Cable Structure surface temperature measured data " and " HBE Cable Structure is along thickness temperature measured data " in the moment that obtains Cable Structure steady temperature data, utilize the thermal conduction study computation model of Cable Structure, by conventional Calculation of Heat Transfer, obtain in the Temperature Distribution of Cable Structure that obtains the moment of Cable Structure steady temperature data, now calculate by stable state in the temperature field of Cable Structure, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculating comprises the accounting temperature of R Cable Structure surface point in Cable Structure, the accounting temperature of R Cable Structure surface point is called R Cable Structure stable state surface temperature computational data, also comprise that Cable Structure is in the accounting temperature of selected HBE " measuring Cable Structure along the point of the temperature profile data of thickness " above, the accounting temperature of HBE " measuring Cable Structure along the point of the temperature profile data of thickness " is called " HBE Cable Structure is along thickness temperature computation data ", when R Cable Structure surface temperature measured data and R Cable Structure stable state surface temperature computational data correspondent equal, and when " HBE Cable Structure is along thickness temperature measured data " and " HBE Cable Structure is along thickness temperature computation data " correspondent equal, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculating is called " Cable Structure steady temperature data " in the method, " R Cable Structure surface temperature measured data " is now called " R Cable Structure stable state surface temperature measured data ", " HBE Cable Structure is along thickness temperature measured data " is called " HBE Cable Structure is along thickness steady temperature measured data ", while getting " R Cable Structure surface point " on the surface of Cable Structure, the quantity of " R Cable Structure surface point " and necessary three conditions that meet that distribute, first condition is when Cable Structure temperature field is during in stable state, on Cable Structure surface the temperature of any point be by " R Cable Structure surface point " with Cable Structure surface on the observed temperature linear interpolation of the adjacent point in this arbitrfary point while obtaining, on the Cable Structure surface that linear interpolation obtains, on the temperature of this arbitrfary point and Cable Structure surface, the error of the actual temperature of this arbitrfary point is not more than 5%, Cable Structure surface comprises support cable surface, second condition is that in " R Cable Structure surface point ", the quantity at the point of same sea level elevation is not less than 4, and uniform along Cable Structure surface at the point of same sea level elevation in " R Cable Structure surface point ", " R Cable Structure surface point " is not more than 0.2 ℃ divided by Δ T along the maximal value Δ h in the absolute value of all differences of the sea level elevation of adjacent Cable Structure surface point between two of sea level elevation hthe numerical value obtaining, gets Δ T for convenience of narration hunit be ℃/m that the unit of getting Δ h for convenience of narration is m, " R Cable Structure surface point " refers to while only considering sea level elevation along the definition of adjacent Cable Structure surface point between two of sea level elevation, in " R Cable Structure surface point ", do not have a Cable Structure surface point, the sea level elevation numerical value of this Cable Structure surface point is between the sea level elevation numerical value of adjacent Cable Structure surface point between two, the 3rd condition is inquiry or obtains the rule at sunshine between Cable Structure location and Altitude Region, place by meteorology conventionally calculation, again according to the geometric properties of Cable Structure and bearing data, in Cable Structure, find and be subject to the sunshine-duration position of those surface points the most fully the whole year, in " R Cable Structure surface point ", having a Cable Structure surface point at least is the annual point being subject in the most sufficient those surface points of sunshine-duration in Cable Structure,
C. according to " the temperature survey calculating method of the Cable Structure of this method ", directly measure and calculate the Cable Structure steady temperature data under original state, Cable Structure steady temperature data under original state are called initial Cable Structure steady temperature data, are designated as " initial Cable Structure steady temperature data vector T o", actual measurement or consult reference materials and obtain the temperature variant physical and mechanical properties parameter of the various materials that Cable Structure used, in actual measurement, obtain T otime, namely obtaining initial Cable Structure steady temperature data vector T othe synchronization in the moment, directly measure the measured data that calculates initial Cable Structure, the measured data of initial Cable Structure is to comprise Cable Structure centre-point load measurement data, Cable Structure distributed load measurement data, Cable Structure volume load measurement data, the initial value of all monitored amounts, the initial rope force data of all support cables, initial Cable Structure modal data, initial Cable Structure strain data, initial Cable Structure geometric data, initial Cable Structure bearing generalized coordinate data, initial Cable Structure angle-data, initial Cable Structure spatial data is in interior measured data, initial Cable Structure bearing generalized coordinate data comprise initial Cable Structure bearing spatial data and initial Cable Structure bearing angular data, when obtaining the measured data of initial Cable Structure, measurement calculates the data of the health status that can express support cable of the Non-destructive Testing Data that comprises support cable, and the data of the health status that can express support cable are now called support cable initial health data, the initial value of all monitored amounts forms monitored amount initial value vector C o, monitored amount initial value vector C othe coding rule of coding rule and M monitored amount identical, utilize support cable initial health data and Cable Structure centre-point load measurement data to set up evaluation object initial damage vector d o, vectorial d orepresent with initial mechanical calculating benchmark model A othe initial health of the evaluation object of the Cable Structure representing, evaluation object initial damage vector d oelement number equal N, d oelement and evaluation object be one-to-one relationship, vectorial d othe coding rule of element identical with the coding rule of evaluation object, if d oevaluation object corresponding to some elements be support cable, so a d in cable system othe numerical value of this element represent the initial damage degree of corresponding support cable, if the numerical value of this element is 0, represent that the corresponding support cable of this element is intact, do not damage, if its numerical value is 100%, represent that the corresponding support cable of this element has completely lost load-bearing capacity, if its numerical value between 0 and 100%, represents this support cable, lost the load-bearing capacity of corresponding proportion, if d oevaluation object corresponding to some elements be some centre-point load, in this method, get d othis element numerical value be 0, the initial value that represents the variation of this centre-point load is 0, if while there is no the Non-destructive Testing Data of support cable and the data of other health status that can express support cable, or can think that structure original state is not damaged during without relaxed state, each element numerical value relevant to support cable in vectorial do gets 0, initial Cable Structure bearing generalized coordinate data form initial Cable Structure bearing generalized coordinate vector U o,
The temperature variant physical and mechanical properties parameter of the various materials that d. use according to measured data, support cable initial health data, Cable Structure centre-point load measurement data, Cable Structure distributed load measurement data, Cable Structure volume load measurement data, the Cable Structure of the design drawing of Cable Structure, as-constructed drawing and initial Cable Structure, initial Cable Structure bearing generalized coordinate vector U o, initial Cable Structure steady temperature data vector T owith all Cable Structure data that preceding step obtains, set up the initial mechanical calculating benchmark model A of the Cable Structure that counts " Cable Structure steady temperature data " o, based on A othe Cable Structure computational data calculating must approach its measured data very much, and difference therebetween must not be greater than 5%; Corresponding to A o" Cable Structure steady temperature data " be exactly " initial Cable Structure steady temperature data vector T o"; Corresponding to A ocable Structure bearing generalized coordinate data be exactly initial Cable Structure bearing generalized coordinate vector U o; Corresponding to A oevaluation object initial damage vector d for evaluation object health status orepresent; Corresponding to A omonitored amount initial value vector C for the initial value of all monitored amounts orepresent; U o, T oand d oa oparameter, by A oinitial value and the C of all monitored amounts of obtaining of Mechanics Calculation result othe initial value of all monitored amounts that represent is identical, therefore also can say C oby A omechanics Calculation result form, A in the method o, C o, d o, U oand T oconstant;
E. in the method, alphabetical i, except representing that significantly, the place of number of steps, alphabetical i only represents cycle index, circulates for the i time; When the i time circulation starts, the current initial mechanical calculating benchmark model of Cable Structure that need to set up or that set up is designated as current initial mechanical calculating benchmark model A i o, A oand A i ocount temperature parameter, can accounting temperature change the Effect on Mechanical Properties to Cable Structure; When the i time circulation starts, corresponding to A i o" Cable Structure steady temperature data " with current initial Cable Structure steady temperature data vector T i orepresent vector T i odefinition mode and vector T odefinition mode identical, T i oelement and T oelement corresponding one by one; When the i time circulation starts, corresponding to A i o" Cable Structure bearing generalized coordinate data " with current initial Cable Structure bearing generalized coordinate vector U i orepresent vectorial U i odefinition mode and vectorial U odefinition mode identical, U i oelement and U oelement corresponding one by one; The current initial damage vector of evaluation object that the i time circulation needs while starting is designated as d i o, d i ocable Structure A while representing this circulation beginning i othe health status of evaluation object, d i odefinition mode and d odefinition mode identical, d i oelement and d oelement corresponding one by one; When the i time circulation starts, the initial value of all monitored amounts, with the current initial value vector of monitored amount C i orepresent vectorial C i odefinition mode and vectorial C odefinition mode identical, C i oelement and C oelement corresponding one by one, the current initial value vector of monitored amount C i oexpression is corresponding to A i othe concrete numerical value of all monitored amounts; U i o, T i oand d i oa i ocharacterisitic parameter, C i oby A i omechanics Calculation result form; When circulation starts for the first time, A i obe designated as A 1 o, set up A 1 omethod for making A 1 oequal A o; When circulation starts for the first time, T i obe designated as T 1 o, set up T 1 omethod for making T 1 oequal T o; When circulation starts for the first time, U i obe designated as U 1 o, set up U 1 omethod for making U 1 oequal U o; When circulation starts for the first time, d i obe designated as d 1 o, set up d 1 omethod for making d 1 oequal d o; When circulation starts for the first time, C i obe designated as C 1 o, set up C 1 omethod for making C 1 oequal C o;
F. from entering the circulation that is walked q step by f here; In structure military service process, according to " the temperature survey calculating method of the Cable Structure of this method " continuous Actual measurement, obtain the current data of Cable Structure steady temperature data, the current data of all " Cable Structure steady temperature data " forms current cable structure steady temperature data vector T i, vector T idefinition mode and vector T odefinition mode identical, T ielement and T oelement corresponding one by one; In actual measurement, obtain current cable structure steady temperature data vector T isynchronization, actual measurement obtains Cable Structure bearing generalized coordinate current data, all Cable Structure bearing generalized coordinate current datas form current cable structures actual measurement bearing generalized coordinate vector U i, vectorial U idefinition mode and vectorial U odefinition mode identical; In actual measurement, obtain vector T itime, actual measurement obtains obtaining current cable structure steady temperature data vector T ithe Cable Structure of synchronization in the moment in the currency of all monitored amounts, all these numerical value form monitored amount current value vector C i, vectorial C idefinition mode and vectorial C odefinition mode identical, C ielement and C oelement corresponding one by one, represent that identical monitored amount is at numerical value in the same time not;
G. according to current cable structure actual measurement bearing generalized coordinate vector U iwith current cable structure steady temperature data vector T i, according to step g 1 to g3, upgrade current initial mechanical calculating benchmark model A i o, the current initial value of monitored amount vector C i o, current initial Cable Structure steady temperature data vector T i owith current initial Cable Structure bearing generalized coordinate vector U i o, and the current initial damage vector of evaluation object d i oremain unchanged;
G1. compare respectively T iand T i o, U iand U i oif, T iequal T i oand U iequal U i o, do not need A i oupgrade, otherwise need to follow these steps to A i o, U i oand T i oupgrade;
G2. calculate U iwith U opoor, U iwith U odifference be exactly Cable Structure bearing about the generalized displacement of support of initial position, with generalized displacement of support vector V, represent generalized displacement of support, V equals U ideduct U o; Calculate T iwith T opoor, T iwith T odifference be exactly that current cable structure steady temperature data are about the variation of initial Cable Structure steady temperature data, T iwith T opoor with steady temperature change vector S, represent, S equals T ideduct T o, S represents the variation of Cable Structure steady temperature data;
G3. first to A oin Cable Structure bearing apply generalized displacement of support constraint, the numerical value of generalized displacement of support constraint is just taken from the numerical value of corresponding element in generalized displacement of support vector V, then to A oin Cable Structure apply temperature variation, the numerical value of the temperature variation applying is just taken from steady temperature change vector S, to A omiddle Cable Structure bearing applies generalized displacement of support constraint and Cable Structure is applied and obtains the current initial mechanical calculating benchmark model A that upgrades after temperature variation i o, upgrade A i otime, U i oall elements numerical value is also used U iall elements numerical value is corresponding to be replaced, and has upgraded U i o, T i oall elements numerical value is also used T icorresponding replacement of all elements numerical value, upgraded T i o, so just obtained correctly corresponding to A i ou i oand T i o, d now i oremain unchanged; When upgrading A i oafter, A i othe current initial damage of the evaluation object vector d for health status of rope i orepresent A i ocurrent cable structure steady temperature data vector T for Cable Structure steady temperature i orepresent A i ocurrent initial Cable Structure bearing generalized coordinate vector U for bearing generalized coordinate i orepresent; Upgrade C i omethod be: when upgrading A i oafter, by Mechanics Calculation, obtain A i oin concrete numerical value all monitored amounts, current, these concrete numerical value form C i o;
H. at current initial mechanical calculating benchmark model A i obasis on, according to step h1, carry out several times Mechanics Calculation to step h4, by calculating, set up unit damage monitored numerical quantity transformation matrices Δ C iwith evaluation object unit change vector D i u;
H1. when the i time circulation starts, directly press step h2 to the listed method acquisition of step h4 Δ C iand D i u; At other constantly, when in step g to A i oafter upgrading, must regain Δ C to the listed method of step h4 by step h2 iand D i uif, in step g not to A i oupgrade, directly proceed to herein step I and carry out follow-up work;
H2. at current initial mechanical calculating benchmark model A i obasis on carry out several times Mechanics Calculation, on calculation times numerical value, equal the quantity N of all evaluation objects, have N evaluation object just to have N calculating; Coding rule according to evaluation object, calculates successively; Calculating each time hypothesis only has an evaluation object on the basis of original damage or centre-point load, to increase unit damage or centre-point load unit change again, concrete, if this evaluation object is a support cable in cable system, so just suppose that this support cable increases unit damage again, if this evaluation object is a centre-point load, just suppose that this centre-point load increases centre-point load unit change again, uses D i ukrecord unit damage or the centre-point load unit change of this increase, wherein k represents to increase the numbering of the evaluation object of unit damage or centre-point load unit change, D i ukevaluation object unit change vector D i uan element, evaluation object unit change vector D i ucoding rule and the vectorial d of element othe coding rule of element identical; The evaluation object that increases again unit damage or centre-point load unit change in calculating is each time different from the evaluation object that increases again unit damage or centre-point load unit change in other calculating, calculate each time the current calculated value that all utilizes mechanics method to calculate all monitored amounts of Cable Structure, the current calculated value of all monitored amounts that calculate each time forms a monitored amount calculation current vector; When k evaluation object of hypothesis increases unit damage or centre-point load unit change again, use C i tkrepresent corresponding " monitored amount calculation current vector "; While giving in this step each vectorial element numbering, should use same coding rule with other vector in this method, to guarantee any one element in each vector in this step, with in other vector, number identical element, expressed the relevant information of same monitored amount or same target; C i tkdefinition mode and vectorial C odefinition mode identical, C i tkelement and C oelement corresponding one by one;
H3. the vectorial C calculating each time i tkdeduct vectorial C i oobtain a vector, then obtain " numerical value change vector δ a C for monitored amount after each element of this vector is calculated to the unit damage suppose or centre-point load unit change numerical value divided by this i k"; There is N evaluation object just to have N " the numerical value change vector of monitored amount ";
H4. by this N " the numerical value change vector of monitored amount ", according to the coding rule of N evaluation object, form successively " the unit damage monitored numerical quantity transformation matrices Δ C that has N row i"; Unit damage monitored numerical quantity transformation matrices Δ C ieach row corresponding to a monitored amount unit change vector; Unit damage monitored numerical quantity transformation matrices Δ C ievery a line corresponding to same monitored amount the different unit change amplitude when different evaluation objects increase unit damage or centre-point load unit change; Unit damage monitored numerical quantity transformation matrices Δ C icoding rule and the vectorial d of row othe coding rule of element identical, unit damage monitored numerical quantity transformation matrices Δ C ithe coding rule of coding rule and M monitored amount of row identical;
I. define the vectorial d of current name damage i cwith current actual damage vector d i, d i cand d ielement number equal the quantity of evaluation object, d i cand d ielement and evaluation object between be one-to-one relationship, d i celement numerical value represent nominal degree of injury or the nominal centre-point load variable quantity of corresponding evaluation object, d i cand d iwith evaluation object initial damage vector d oelement coding rule identical, d i celement, d ielement and d oelement be one-to-one relationship;
J. according to monitored amount current value vector C iwith " the current initial value vector of monitored amount C i o", " unit damage monitored numerical quantity transformation matrices Δ C i" and " the vectorial d of current name damage i c" between the linear approximate relationship that exists, this linear approximate relationship can be expressed as formula 1, in formula 1 except d i cother outer amount is known, solves formula 1 and just can calculate the vectorial d of current name damage i c;
C i = C o i + Δ C i · d c i Formula 1
K. the current actual damage vector d that utilizes formula 2 to express ik element d i kwith the current initial damage vector of evaluation object d i ok element d i okwith the vectorial d of current name damage i ck element d i ckbetween relation, calculate current actual damage vector d iall elements;
K=1 in formula 2,2,3 ..., N; d i kthe current actual health status that represents k evaluation object in the i time circulation, if this evaluation object is support cable, so a d in cable system i krepresent its current actual damage, d i kbe to represent not damaged at 0 o'clock, while being 100%, represent that this support cable thoroughly loses load-bearing capacity, in the time of between 0 and 100%, represent to lose the load-bearing capacity of corresponding proportion; If this evaluation object is centre-point load, so a d i kthe actual change amount that represents this centre-point load; So far this method has realized and has rejected damaged cable identification impact, Cable Structure that generalized displacement of support, centre-point load variation and structure temperature change, and has realized simultaneously and has rejected generalized displacement of support, structure temperature variation and identification support cable health status variable effect, centre-point load variable quantity;
L. try to achieve the vectorial d of current name damage i cafter, according to formula 3, set up mark vector B i, formula 4 has provided the definition of k the element of mark vector Bi;
B i = B 1 i B 2 i · · · B k i · · · B N i T Formula 3
Element B in formula 4 i kmark vector B ik element, D i ukevaluation object unit change vector D i uk element, d i ckthe vectorial d of the current name damage of evaluation object i ck element, they all represent the relevant information of k evaluation object, k=1 in formula 4,2,3 ..., N;
If mark vector B m. ielement be 0 entirely, get back to step f and continue this circulation; If mark vector B ielement be not 0 entirely, enter next step, be step n;
N. according to formula 5 calculate next time, i.e. the i+1 time current initial damage vector of the required evaluation object of circulation d i+1 oeach element;
D in formula 5 i+1 okthe current initial damage vector of the required evaluation object d that next time, circulates for the i+1 time i+1 ok element, d i okthe current initial damage vector of the evaluation object d that is this, circulates for the i time i ok element, D i ukthe evaluation object unit change vector D of the i time circulation i uk element, B i kthe mark vector B of the i time circulation ik element, k=1 in formula 5,2,3 ..., N;
O. at initial mechanical calculating benchmark model A obasis on, first to A oin Cable Structure bearing apply generalized displacement of support constraint, the numerical value of generalized displacement of support constraint is just taken from the numerical value of corresponding element in generalized displacement of support vector V, then to A oin Cable Structure apply temperature variation, the numerical value of the temperature variation applying is just taken from steady temperature change vector S, then to make the health status of rope be d i+1 oafter obtain be exactly next time, i.e. the i+1 time required Mechanics Calculation benchmark model A of circulation i+1; Obtain A i+1after, by Mechanics Calculation, obtain A i+1in concrete numerical value all monitored amounts, current, these concrete numerical value form next time, the vectorial C of the current initial value of required monitored amount that circulates for the i+1 time i+1 o;
P. take off once, i.e. the i+1 time required current initial Cable Structure steady temperature data vector T of circulation i+1 oequal the current initial Cable Structure steady temperature data vector T of the i time circulation i o; The required current initial Cable Structure bearing generalized coordinate vector U of the i+1 time circulation next time, i.e. i+1 oequal the current initial Cable Structure bearing generalized coordinate vector U of the i time circulation i o;
Q. get back to step f, start circulation next time.
CN201310662323.2A 2013-12-09 2013-12-09 Generalized displacement strain monitoring progressive identification method for damaged cable and concentrated loads CN103616231A (en)

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CN103913325A (en) * 2014-03-10 2014-07-09 东南大学 Generalized displacement hybrid monitoring defective cable load progressive identification method
CN104990587A (en) * 2015-07-23 2015-10-21 东南大学 Simplified method of recognizing problematic load cable generalized displacement through strain monitoring

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