CN103868731A  Generalized displacement strain monitoring damaged cable load identification method  Google Patents
Generalized displacement strain monitoring damaged cable load identification method Download PDFInfo
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 CN103868731A CN103868731A CN201410085769.8A CN201410085769A CN103868731A CN 103868731 A CN103868731 A CN 103868731A CN 201410085769 A CN201410085769 A CN 201410085769A CN 103868731 A CN103868731 A CN 103868731A
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Abstract
A generalized displacement strain monitoring damaged cable load identification method is characterized in that based on strain monitoring, whether to update a mechanical calculation benchmark model of a cable structure is determined by monitoring the generalized displacement of a support, the temperature of the cable structure and environment temperature, a mechanical calculation benchmark model of the cable structure, including the generalized displacement of the support, the temperature of the cable structure and the environment temperature, is obtained, and a unit damage monitored coordinate numerical change matrix is obtained by calculating based on the obtained model; according to the approximate linear relation existing between the current numeric vector of a monitored coordinate and the current initial numeric vector of the monitored coordinate, the unit damage monitored coordinate numerical change matrix, as well as tobesolved current nominal damage vector of an evaluated object, the noninferior solution of the current nominal damage vector of the evaluated object is calculated, and thus when the generalized displacement of the support and temperature change occur, the influence of interference factors can be removed, and the change of the load and the damaged cable can be identified.
Description
Technical field
Cablestayed bridge, suspension bridge, the structures such as trussframe structure have a common ground, be exactly that they have many parts that bear tensile load, as suspension cable, main pushtowing 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 carryingropes 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, unified be called " cable system " for simplicity, in this method, censure ropeway carryingrope with " support cable " this noun, 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, trussframe structure reality is just referred to two power rod members.In structure military service process, the correct identification of the health status to support cable or cable system is related to the safety of whole Cable Structure.In the time that environment temperature changes, the temperature of Cable Structure generally also can be along with changing, in the time that Cable Structure temperature changes, may there is generalized displacement in Cable Structure bearing, the 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 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 variation of rejecting structure temperature, Cable Structure generalized displacement of support and structural health conditions change the impact of the recognition result of the variable quantity of the load that structure is born, significant equally to structural safety, this method discloses a kind of effective ways that solve these two problems.
Summary of the invention
Technical matters: this method discloses a kind of method, two kinds of functions that existing method can not possess are realized, be respectively, one, in the time that bearing has generalized displacement, when the load of bearing in structure and structure (environment) temperature variation, can reject generalized displacement of support, load change 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, in identifying damaged cable, can also identify the variation of load simultaneously, and this method can be rejected the impact that generalized displacement of support, structure temperature variation and support cable health status change, and realizes the correct identification of load change degree.
Technical scheme: in the method, censure the coordinate of bearing about the X, Y, Z axis of Descartes's rectangular coordinate system with " bearing volume coordinate ", also can be said to is the volume coordinate of bearing about X, Y, Z axis, bearing is called the volume coordinate component of bearing about this axle about the concrete numerical value of the volume coordinate of some axles, and in this method, also a volume coordinate component with bearing is expressed the concrete numerical value of bearing about the volume coordinate of some axles; Censure the angular coordinate of bearing about X, Y, Z axis with " bearing angular coordinate ", bearing is called the angular coordinate component of bearing about this axle about the concrete numerical value of the angular coordinate of some axles, and in this method, also an angular coordinate component with bearing is expressed the concrete numerical value of bearing about the angular coordinate of some axles; All by " bearing generalized coordinate " denotion bearing angular coordinate and bearing volume coordinate, in this method, also a generalized coordinate component with bearing is expressed the concrete numerical value of bearing about 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, and in this method, also a translational component with bearing is expressed the concrete numerical value of bearing about 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, and in this method, also an angular displacement component with bearing is expressed the concrete numerical value of bearing about the angular displacement of some axles; Generalized displacement of support denotion support wire displacement and angular displacement of support are all, and in this method, also a generalized displacement component with bearing is expressed 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 support wire displacement or the translational displacement component at gravity direction.
The external force that object, structure are born can be described as load, and load comprises face load and volume load.Face load claims again surface load, is the load that acts on body surface, comprises two kinds of centrepoint load and distributed loads.Volume load is that continuous distribution is in the load of interior of articles each point, as the deadweight of object and inertial force.
Centrepoint 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, if load is actually centrepoint load, in the method a concentrated force component or a concentrated couple component are called to a load, the now variation of load is embodied as the variation of a concentrated force component or a concentrated couple component.
Distributed load is divided into line distributed load and face distributed load, the description of distributed load at least comprises the zone of action of distributed load and the size of distributed load, the size of distributed load is expressed by distribution intensity, distribution for intensity distribution characteristics (for example uniform, the distribution characteristicss such as sine function) and amplitude is expressed, and (for example two distributed loads are all uniform, but its amplitude difference, can welldistributed pressure be the concept that example illustrates amplitude: same structure is born two different welldistributed pressures, two distributed loads are all uniformly distributed loads, but the amplitude of a distributed load is 10MPa, the amplitude of another distributed load is 50MPa).If load is actually distributed load, when this method is talked about the variation of load, in fact refer to the change of the amplitude of distributed load distribution intensity, and the distribution characteristics of the zone of action of distributed load and distribution intensity is constant.In coordinate system, a distributed load can be resolved into several components, if the amplitude of the distribution intensity separately of several components of this distributed load changes, and the ratio changing is all not identical, so in the method the component of these several distributed loads is regarded as to the independently distributed load of same quantity, now load just represents the component of a distributed load, also component identical the amplitude changing ratio of the intensity that wherein distributes can be synthesized to a distributed load or be called a load.
Volume load is that continuous distribution is in the load of interior of articles each point, as the deadweight of object and inertial force, the description of volume load at least comprises the zone of action of volume load and the size of volume load, the size of volume load is expressed by distribution intensity, distribution for intensity distribution characteristics (for example uniform, the distribution characteristicss such as linear function) and amplitude is expressed, and (for example two individual stow lotuses are all uniform, but its amplitude difference, can conduct oneself with dignity the concept of amplitude is described for example: the material difference of two parts of same structure, therefore density difference, so although the suffered volume load of these two parts is all uniform, but the amplitude of the suffered volume load of part may be 10kN/m
^{3}, the amplitude of the suffered volume load of another part is 50kN/m
^{3}).If load is actually volume load, actual treatment is the change of the amplitude of volume load distribution intensity in the method, and the distribution characteristics of the zone of action of volume load and distribution intensity is constant, while now mentioning in the method the change of load, in fact refer to the change of the amplitude of the distribution intensity of volume load, now, the load changing refers to the volume load that the amplitude of those distribution intensities changes.In coordinate system, one individual stow lotus can be resolved into several components (for example, in Descartes's rectangular coordinate system, volume load can resolve into the component about three axles of coordinate system, that is to say, in Descartes's rectangular coordinate system, volume load can resolve into three components), if the amplitude of the distribution intensity separately of several components of this volume load changes, and the ratio changing is all not identical, so in the method the component of this several body stow lotus is regarded as to the independently load of same quantity, also the volume sharing part of the load identical the amplitude changing ratio of the intensity that wherein distributes can be synthesized to an individual stow lotus or be called a load.
In the time that load is embodied as centrepoint load, in the method, " load unit variation " in fact refers to " unit change of centrepoint load ", similarly, " load change " specifically refers to " the big or small variation of centrepoint load ", " load change amount " specifically refers to " the big or small variable quantity of centrepoint load ", " load change degree " specifically refers to " the big or small intensity of variation of centrepoint load ", " the actual change amount of load " refers to " the big or small actual change amount of centrepoint load ", " load changing " refers to " centrepoint load that size changes ", briefly, now " soandso load soandso variation " refers to " soandso centrepoint load big or small soandso variation ".
In the time that load is embodied as distributed load, in the method, " load unit variation " in fact refers to " unit change of the amplitude of the distribution intensity of distributed load ", and the distribution characteristics of distributed load is constant, similarly, " load change " specifically refers to " variation of the amplitude of the distribution intensity of distributed load ", and the distribution characteristics of distributed load is constant, " load change amount " specifically refers to " variable quantity of the amplitude of the distribution intensity of distributed load ", " load change degree " specifically refers to " intensity of variation of the amplitude of the distribution intensity of distributed load ", " the actual change amount of load " specifically refers to " the actual change amount of the amplitude of the distribution intensity of distributed load ", " load changing " refers to " distributed load that the amplitude of distribution intensity changes ", briefly, now " soandso load soandso variation " refers to " amplitude of the distribution intensity of soandso distributed load soandso variation ", and the distribution characteristics of the zone of action of all distributed loads and distribution intensity is constant.
In the time that load is embodied as volume load, in the method, " load unit variation " in fact refers to " unit change of the amplitude of the distribution intensity of volume load ", similarly, " load change " refers to " variation of the amplitude of the distribution intensity of volume load ", " load change amount " refers to " variable quantity of the amplitude of the distribution intensity of volume load ", " load change degree " refers to " intensity of variation of the amplitude of the distribution intensity of volume load ", " the actual change amount of load " refers to " the actual change amount of the amplitude of the distribution intensity of volume load ", " load changing " refers to " the volume load that the amplitude of distribution intensity changes ", briefly, " soandso load soandso variation " refers to " amplitude of the distribution intensity of soandso volume load soandso variation ", and the distribution characteristics of the zone of action of all volume load and distribution intensity is constant.
This method specifically comprises:
A. for sake of convenience, it is evaluation object that this method unitedly calls evaluated support cable and load, establishes the quantity of evaluated support cable and the quantity sum of 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 used 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 specifying, 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 used for generating vector sum matrix in subsequent step, and " the whole monitored strain data of Cable Structure " is made up of abovementioned 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, must not be greater than 30 minutes to the time interval between any twice measurement of same amount RealTime Monitoring, the moment of survey record data is called the physical record data moment; The external force that object, structure are born can be described as load, and load comprises face load and volume load; Face load claims again surface load, is the load that acts on body surface, comprises two kinds of centrepoint load and distributed loads; Volume load is that continuous distribution is in the load of interior of articles each point, including the deadweight and inertial force of object; Centrepoint load is divided into two kinds of concentrated force and concentrated couples, comprising in the coordinate system of Descartes's rectangular coordinate in tying up to, a concentrated force can resolve into three components, same, a concentrated couple also can resolve into three components, if load is actually centrepoint load, in the method a concentrated force component or a concentrated couple component being counted or added up is a load, and the now variation of load is embodied as the variation of a concentrated force component or a concentrated couple component; Distributed load is divided into line distributed load and face distributed load, and the description of distributed load at least comprises the zone of action of distributed load and the size of distributed load, and the size of distributed load is expressed by distribution intensity, and distribution intensity is expressed by distribution characteristics and amplitude; If load is actually distributed load, when this method is talked about the variation of load, in fact refer to the change of the amplitude of distributed load distribution intensity, and the distribution characteristics of the zone of action of all distributed loads and distribution intensity is constant; Comprising in the coordinate system of Descartes's rectangular coordinate in tying up to, a distributed load can be resolved into three components, if the amplitude of the distribution intensity separately of three components of this distributed load changes, and the ratio changing is all not identical, so in the method three components of this distributed load being counted or added up is three distributed loads, and now load just represents the onecomponent of distributed load; Volume load be continuous distribution in the load of interior of articles each point, the description of volume load at least comprises the zone of action of volume load and the size of volume load, the size of volume load is expressed by distribution intensity, distribution intensity is expressed by distribution characteristics and amplitude; If load is actually volume load, actual treatment is the change of the amplitude of volume load distribution intensity in the method, and the distribution characteristics of the zone of action of all volume load and distribution intensity is constant, while now mentioning in the method the change of load, in fact refer to the change of the amplitude of the distribution intensity of volume load, now, the load changing refers to the volume load that the amplitude of those distribution intensities changes; Comprising in the coordinate system of Descartes's rectangular coordinate in tying up to, one individual stow lotus can be resolved into three components, if the amplitude of the distribution intensity separately of three components of this volume load changes, and the ratio changing is all not identical, and so in the method three components of this volume load being counted or added up is three distributed loads;
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, asconstructed 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 obtain each cloudy day in T cloudy day 0 after the sunrise moment next day highest temperature and the lowest temperature between 30 minutes, the sunrise moment on the meteorology that the sunrise moment refers to base area revolutions and the rule that revolves round the sun is definite, do not represent necessarily can see the same day sun, can inquire about data or calculate sunrise moment of each required day by conventional meteorology, each cloudy day 0 after the sunrise moment next day highest temperature between 30 minutes deduct the maximum temperature difference that the lowest temperature is called this cloudy daily temperature, there is T cloudy day, just there is the maximum temperature difference of 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, be designated as Δ T with reference to temperature difference per day
_{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}, get Δ T for convenience of narration
_{h}unit 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, the temperature of this R Cable Structure surface point will be obtained by actual measurement below, 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, obtain the temperature of this R Cable Structure surface point by Calculation of Heat Transfer, 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 least choose two points at the intersection place on surface level and Cable Structure surface, from the outer normal of selected point straw line body structure surface, all outer normal directions of choosing are called " measuring the direction of Cable Structure along 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, measure Cable Structure along each and be no less than three points along direction uniform choosing in Cable Structure of the Temperature Distribution of wall thickness, 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 the direction of Cable Structure along 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 the direction of Cable Structure along the Temperature Distribution of wall thickness, direction along each measurement Cable Structure along the Temperature Distribution of wall thickness has been chosen E point in Cable Structure, 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 the point of Cable Structure along the temperature profile data of thickness ", to obtain by actual measurement the temperature of this HBE " measuring the point of Cable Structure along the temperature profile data of thickness " below, 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, obtain this HBE by Calculation of Heat Transfer and measure the temperature of Cable Structure along 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, measure temperature in Cable Structure location according to meteorology and require to choose a position, will obtain the temperature of the Cable Structure place environment that meets the requirement of meteorology measurement temperature in this position actual measurement, in the onsite spaciousness of Cable Structure, unobstructed place chooses a position, this position should each of the whole year day can obtain this ground the most sufficient sunshine of getable this day, at the flat board of 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 each of the whole year day can obtain one flat plate on this ground the most sufficient sunshine of getable this day, the nonsunny slope of reference plate is covered with insulation material, RealTime Monitoring is obtained to the temperature of the sunny slope of reference plate,
B2: RealTime Monitoring obtains R Cable Structure surface temperature measured data of abovementioned R Cable Structure surface point, RealTime Monitoring obtains the temperature profile data of previously defined Cable Structure along thickness simultaneously, and RealTime Monitoring obtains the temperature record of the Cable Structure place environment that meets the requirement of meteorology measurement temperature simultaneously, obtain being carved at sunrise the same day temperature measured data sequence of the Cable Structure place environment between 30 minutes after sunrise moment next day by RealTime Monitoring, 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 30 minutes after the sunrise moment next day same day, find maximum temperature and minimum temperature in the temperature measured data sequence of Cable Structure place environment, deduct and be carved at sunrise the maximum temperature difference between 30 minutes after sunrise moment next day on same day that minimum temperature obtains Cable Structure place environment by the maximum temperature in the temperature measured data sequence of Cable Structure place environment, be called environment maximum temperature difference, be designated as Δ T
_{emax}, temperature measured data sequence by Cable Structure place environment obtains the temperature of Cable Structure place environment about the rate of change of time by conventional mathematical computations, and this rate of change is also along with the time changes, obtain being carved at sunrise the same day measured data sequence of the temperature of the sunny slope of the reference plate between 30 minutes after sunrise moment next day by RealTime Monitoring, the measured data sequence of the temperature of the sunny slope of reference plate is arranged according to time order and function order by the measured data that was carved at sunrise the temperature of the sunny slope of the reference plate between 30 minutes after the sunrise moment next day same day, find maximum temperature and minimum temperature in the measured data sequence of temperature of the sunny slope of reference plate, deduct and be carved at sunrise the maximum temperature difference between 30 minutes after sunrise moment next day on same day that minimum temperature obtains the temperature of the sunny slope of reference plate by the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate, be called reference plate maximum temperature difference, be designated as Δ T
_{pmax}, obtain being carved at sunrise the same day Cable Structure surface temperature measured data sequence of all R Cable Structure surface points between 30 minutes after sunrise moment next day by RealTime Monitoring, 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 is arranged according to time order and function order by being carved at sunrise the Cable Structure surface temperature measured data between 30 minutes after the sunrise moment next day same day of a Cable Structure surface point, find maximum temperature and minimum temperature in each Cable Structure surface temperature measured data sequence, deduct and be carved at sunrise the maximum temperature difference between 30 minutes after sunrise moment next day on same day that minimum temperature obtains the temperature of each Cable Structure surface point by the maximum temperature in each Cable Structure surface temperature measured data sequence, there is R Cable Structure surface point just to have to be carved at sunrise R the same day maximum temperature difference numerical value between 30 minutes after sunrise moment next day, maximal value is wherein called Cable Structure surface maximum temperature difference, be designated as Δ T
_{smax}, obtain the temperature of each Cable Structure surface point about the rate of change of time by each Cable Structure surface temperature measured data sequence by conventional mathematical computations, the temperature of each Cable Structure surface point about the rate of change of time also along with the time changes, obtain being carved at sunrise the same day after sunrise moment next day between 30 minutes by RealTime Monitoring, at synchronization, after HBE " Cable Structure is along the temperature profile data of thickness ", calculate the sea level elevation place that chooses at each and amount 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 ", choose 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, Section 1 condition be obtain Cable Structure steady temperature data moment after being carved at sunset sunrise moment next day between 30 minutes on same day, the sunset moment refers to the sunset moment on base area revolutions and the definite meteorology of revolution rule, can inquire about data or calculate sunset moment of each required day by conventional meteorology, the a condition of Section 2 condition be after being carved at sunrise sunrise moment next day on same day between 30 minutes during this period of time in, reference plate maximum temperature difference Δ T
_{pmax}with Cable Structure surface maximum temperature difference Δ T
_{smax}all be not more than 5 degrees Celsius, the b condition of Section 2 condition be after being carved at sunrise sunrise moment next day on same day between 30 minutes during this period of time in, measure the environment maximum error Δ T that calculates above
_{emax}be not more than with reference to temperature difference per day Δ T
_{r}, and reference plate maximum temperature difference Δ T
_{pmax}after deducting 2 degrees Celsius, be not more than Δ T
_{emax}, and Cable Structure surface maximum temperature difference Δ T
_{smax}be not more than Δ T
_{pmax}, only need meet in a condition of Section 2 and b condition one is just called and meets Section 2 condition, Section 3 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, Section 4 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, Section 5 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 minimal value between 30 minutes after the sunrise moment next day same day, Section 6 condition is at the moment that obtains Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T
_{tmax}be not more than 1 degree Celsius, this method is utilized abovementioned six conditions, any one in following three kinds of moment is called to " the mathematics moment that obtain Cable Structure steady temperature data ", the first moment is to meet Section 1 in abovementioned " condition relevant to the moment that determines the to obtain Cable Structure steady temperature data " moment to Section 5 condition, the second moment is the moment that only meets the Section 6 condition in abovementioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data ", the third moment is to meet Section 1 in abovementioned " condition relevant to the moment that determines the to obtain Cable Structure steady temperature data " moment to Section 6 condition simultaneously, be exactly in this method when one in the physical record data moment when obtaining the mathematics moment of Cable Structure steady temperature data, the moment that obtains Cable Structure steady temperature data is exactly the mathematics moment that obtains Cable Structure steady temperature data, be not any moment in the physical record data moment in this method if obtain the mathematics moment of Cable Structure steady temperature data, getting this method is the moment that obtains Cable Structure steady temperature data close to moment of those physical record data in the mathematics moment that obtains Cable Structure steady temperature data, this method will be used the amount at the moment survey record that obtains Cable Structure steady temperature data to carry out the relevant health monitoring analysis of Cable Structure, 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. the not temporal evolution of Cable Structure temperature in this moment, and this moment is exactly " obtaining the moment of Cable Structure steady temperature data " of this method, 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, obtain obtaining the Temperature Distribution of Cable Structure in moment of Cable Structure steady temperature data by conventional Calculation of Heat Transfer, 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 the accounting temperature of Cable Structure selected HBE " measuring the point of Cable Structure along the temperature profile data of thickness " above, the accounting temperature of HBE " measuring the point of Cable Structure along the temperature profile data of thickness " is called " HBE Cable Structure is along thickness temperature computation data ", in the time of 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 ", get " R Cable Structure surface point " on the surface of Cable Structure time, 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, when the temperature of any point on Cable Structure surface be by " R Cable Structure surface point " in 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
_{h}the numerical value obtaining, gets Δ T for convenience of narration
_{h}unit 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 sunshineduration 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 sunshineduration in Cable Structure,
C. directly measure according to " the temperature survey calculating method of the Cable Structure of this method " the Cable Structure steady temperature data that calculate 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 uses, obtain T in actual measurement
_{o}time, namely obtaining initial Cable Structure steady temperature data vector T
_{o}the synchronization in moment, directly measure the measured data that calculates initial Cable Structure, the measured data of initial Cable Structure is to comprise Cable Structure centrepoint 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 angledata, 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 generalized coordinate data, in obtaining the measured data of initial Cable Structure, measurement calculates the data of the health status that can express support cable including the Nondestructive Testing Data of 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
_{o}the coding rule of coding rule and M monitored amount identical, utilize support cable initial health data and Cable Structure load measurement data to set up evaluation object initial damage vector d
_{o}, vectorial d
_{o}represent with initial mechanical calculating benchmark model A
_{o}the initial health of the evaluation object of the Cable Structure representing, evaluation object initial damage vector d
_{o}element number equal N, d
_{o}element and evaluation object be onetoone relationship, vectorial d
_{o}the coding rule of element identical with the coding rule of evaluation object, if d
_{o}evaluation object corresponding to some elements be support cable, so a d in cable system
_{o}the 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 loadbearing capacity, lost the loadbearing capacity of corresponding proportion if its numerical value between 0 and 100%, represents this support cable, if d
_{o}evaluation object corresponding to some elements be some load, in this method, get d
_{o}this element numerical value be 0, the initial value that represents the variation of this load is 0, if while not having the Nondestructive Testing Data of support cable and other can express the data of health status of support cable, or can think that structure original state is not damaged during without relaxed state, vectorial d
_{o}in the 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 centrepoint 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, asconstructed drawing and initial Cable Structure, initial Cable Structure bearing generalized coordinate vector U
_{o}, initial Cable Structure steady temperature data vector T
_{o}with 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
_{o}the 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
_{o}evaluation object initial damage vector d for evaluation object health status
_{o}represent; Corresponding to A
_{o}monitored amount initial value vector C for the initial value of all monitored amounts
_{o}represent; Set up for the first time the current initial mechanical calculating benchmark model A of the Cable Structure that counts " Cable Structure steady temperature data "
^{t} _{o}, the current initial value of monitored amount vector C
^{t} _{o}" current initial Cable Structure steady temperature data vector T
^{t} _{o}"; Set up for the first time the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}with the current initial value vector of monitored amount C
^{t} _{o}time, the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}just equal the initial mechanical calculating benchmark model A of Cable Structure
_{o}, the current initial value vector of monitored amount C
^{t} _{o}just equal monitored amount initial value vector C
_{o}; A
^{t} _{o}corresponding " Cable Structure steady temperature data " are called " current initial Cable Structure steady temperature data ", are designated as " current initial Cable Structure steady temperature data vector T
^{t} _{o}", set up for the first time the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}time, T
^{t} _{o}just equal T
_{o}; Corresponding to the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}the current initial Cable Structure bearing generalized coordinate vector U of Cable Structure bearing generalized coordinate data compositions
^{t} _{o}, set up for the first time the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}time, U
^{t} _{o}just equal U
_{o}; A
^{t} _{o}initial health and the A of evaluation object
_{o}the health status of evaluation object identical, also use evaluation object initial damage vector d
_{o}represent A in cyclic process below
^{t} _{o}the initial health of evaluation object use all the time evaluation object initial damage vector d
_{o}represent; T
_{o}, U
_{o}and d
_{o}a
_{o}parameter, by A
_{o}initial value and the C of all monitored amounts of obtaining of Mechanics Calculation result
_{o}the initial value of all monitored amounts that represent is identical, therefore also can say C
_{o}by A
_{o}mechanics Calculation result composition; T
^{t} _{o}, U
^{t} _{o}and d
_{o}a
^{t} _{o}parameter, C
^{t} _{o}by A
^{t} _{o}mechanics Calculation result composition;
E. from entering the circulation that is walked m step by e here; In structure military service process, constantly according to " the temperature survey calculating method of the Cable Structure of this method " the constantly current data of Actual measurement acquisition " Cable Structure steady temperature data ", the current data of " Cable Structure steady temperature data " is called " current cable structure steady temperature data ", is designated as " current cable structure steady temperature data vector T
^{t}", vector T
^{t}definition mode and vector T
_{o}definition mode identical; Obtain current cable structure steady temperature data vector T in actual measurement
^{t}synchronization, actual measurement obtains Cable Structure bearing generalized coordinate current data, all Cable Structure bearing generalized coordinate current datas composition current cable structures actual measurement bearing generalized coordinate vector U
^{t}, vectorial U
^{t}definition mode and vectorial U
_{o}definition mode identical;
F. according to current cable structure actual measurement bearing generalized coordinate vector U
^{t}with current cable structure steady temperature data vector T
^{t}, upgrade current initial mechanical calculating benchmark model A according to step f1 to f3
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, the current initial value of monitored amount vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o};
F1. compare respectively U
^{t}with U
^{t} _{o}, T
^{t}with T
^{t} _{o}if, U
^{t}equal U
^{t} _{o}and T
^{t}equal T
^{t} _{o}, A
^{t} _{o}, U
^{t} _{o}, C
^{t} _{o}and T
^{t} _{o}remain unchanged, otherwise need to follow these steps to A
^{t} _{o}, U
^{t} _{o}and T
^{t} _{o}upgrade;
F2. calculate U
^{t}with U
_{o}poor, U
^{t}with U
_{o}difference be exactly the generalized displacement of support of Cable Structure bearing about initial position, represent generalized displacement of support with generalized displacement of support vector V, V equals U
^{t}deduct U
_{o}, between the element in generalized displacement of support vector V and generalized displacement of support component, be onetoone 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; Calculate T
^{t}with T
_{o}poor, T
^{t}with T
_{o}difference be exactly the variations of current cable structure steady temperature data about initial Cable Structure steady temperature data, T
^{t}with T
_{o}poor represent with steady temperature change vector S, S equals T
^{t}deduct T
_{o}, S represents the variation of Cable Structure steady temperature data;
F3. first to A
_{o}in 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
_{o}in Cable Structure apply temperature variation, the numerical value of the temperature variation applying is just taken from steady temperature change vector S, to A
_{o}middle Cable Structure bearing applies generalized displacement of support constraint and to A
_{o}in the temperature variation that applies of Cable Structure after obtain the current initial mechanical calculating benchmark model A that upgrades
^{t} _{o}, upgrade A
^{t} _{o}time, U
^{t} _{o}all elements numerical value is also used U
^{t}all elements numerical value is corresponding to be replaced, and has upgraded U
^{t} _{o}, T
^{t} _{o}all elements numerical value is also used T
^{t}corresponding replacement of all elements numerical value, upgraded T
^{t} _{o}, so just obtained correctly corresponding to A
^{t} _{o}t
^{t} _{o}and U
^{t} _{o}; Upgrade C
^{t} _{o}method be: when upgrade A
^{t} _{o}after, obtain A by Mechanics Calculation
^{t} _{o}in concrete numerical value all monitored amounts, current, these concrete numerical value compositions C
^{t} _{o}; A
^{t} _{o}the initial health of support cable use all the time evaluation object initial damage vector d
_{o}represent;
G. at current initial mechanical calculating benchmark model A
^{t} _{o}basis on carry out several times Mechanics Calculation according to step g 1 to g4, obtain Cable Structure unit damage monitored numerical quantity transformation matrices Δ C and evaluation object unit change vector D by calculating
_{u};
G1. Cable Structure unit damage monitored numerical quantity transformation matrices Δ C constantly updates, and is upgrading current initial mechanical calculating benchmark model A
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, the current initial value of monitored amount vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o}afterwards, must then upgrade Cable Structure unit damage monitored numerical quantity transformation matrices Δ C and evaluation object unit change vector D
_{u};
G2. at the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}basis 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; According to the coding rule of evaluation object, calculate successively; Calculate each time hypothesis and only have an evaluation object on the basis of original damage or load, to increase again unit damage or load unit variation, concrete, if this evaluation object is a support cable in cable system, so just suppose that this support cable is at vectorial d
_{o}on the basis of the existing damage of this support cable representing, increase again unit damage, if this evaluation object is a load, just suppose that this load is at vectorial d
_{o}on the basis of the existing variable quantity of this load representing, increase again load unit and change, use D
_{uk}the unit damage or the load unit that record this increase change, and wherein k represents the numbering of the evaluation object that increases unit damage or load unit variation, D
_{uk}evaluation object unit change vector D
_{u}an element, evaluation object unit change vector D
_{u}coding rule and the vectorial d of element
_{o}the coding rule of element identical; The evaluation object that increases unit damage or load unit variation in calculating is each time different from the evaluation object that increases unit damage or load unit variation in other calculating, calculate each time the current calculated value that all utilizes mechanics method to calculate all monitored amounts of Cable Structure, a monitored amount calculation current vector of current calculated value composition of all monitored amounts that calculate each time, the element coding rule of monitored amount calculation current vector and monitored amount initial value vector C
_{o}element coding rule identical;
G3. the monitored amount calculation current vector calculating each time deducts the current initial value vector of monitored amount C
^{t} _{o}obtain a vector, then each element of this vector is calculated to unit damage or the load unit variation numerical value supposed divided by this time, obtain a monitored amount unit change vector, have N evaluation object just to have N monitored amount unit change vector;
G4. by this N monitored amount unit change vector according to the coding rule of N evaluation object, composition has the Cable Structure unit damage monitored numerical quantity transformation matrices Δ C that N is listed as successively; Each of Cable Structure unit damage monitored numerical quantity transformation matrices Δ C is listed as corresponding to a monitored amount unit change vector; Every a line of Cable Structure unit damage monitored numerical quantity transformation matrices Δ C is the different unit change amplitude in the time that different evaluation objects increase unit damage or load unit variation corresponding to same monitored amount; Coding rule and the vectorial d of the row of Cable Structure unit damage monitored numerical quantity transformation matrices Δ C
_{o}the coding rule of element identical, the coding rule of the row of Cable Structure unit damage monitored numerical quantity transformation matrices Δ C is identical with the coding rule of M monitored amount;
H. obtain current cable structure steady temperature data vector T in actual measurement
^{t}time, actual measurement obtains obtaining current cable structure steady temperature data vector T
^{t}the current measured value of all monitored amounts of Cable Structure of synchronization in moment, form monitored amount current value vector C; The current initial value vector of monitored amount current value vector C and monitored amount C
^{t} _{o}with monitored amount initial value vector C
_{o}definition mode identical, the same monitored amount of element representation of three vectorial identical numberings is at concrete numerical value in the same time not;
I. define the vectorial d of the current name damage of evaluation object, the element number of the vectorial d of the current name damage of evaluation object equals the quantity of evaluation object, between the element of the vectorial d of the current name damage of evaluation object and evaluation object, be onetoone relationship, the element numerical value of the vectorial d of the current name damage of evaluation object represents nominal degree of injury or the nominal load variable quantity of corresponding evaluation object; Coding rule and the vectorial d of the element of vector d
_{o}the coding rule of element identical;
J. the monitored amount current value vector of foundation C is with the current initial value vector of monitored amount C
^{t} _{o}, the linear approximate relationship that exists between Cable Structure unit damage monitored numerical quantity transformation matrices Δ C and the vectorial d of the current name damage of evaluation object to be asked, this linear approximate relationship can be expressed as formula 1, other amount in formula 1 except d is known, solves formula 1 and just can calculate the vectorial d of the current name damage of evaluation object;
K. define the current actual damage vector of evaluation object d
^{a}, the current actual damage vector of evaluation object d
^{a}element number equal the quantity of evaluation object, the current actual damage vector of evaluation object d
^{a}element and evaluation object between be onetoone relationship, the current actual damage of evaluation object vector d
^{a}element numerical value represent actual damage degree or the real load variable quantity of corresponding evaluation object; Vector d
^{a}coding rule and the vectorial d of element
_{o}the coding rule of element identical;
L. the current actual damage vector of the evaluation object d that utilizes formula 2 to express
^{a}k element d
^{a} _{k}with evaluation object initial damage vector d
_{o}k element d
_{ok}k the element d with the vectorial d of the current name damage of evaluation object
_{k}between relation, calculate the current actual damage of evaluation object vector d
^{a}all elements;
K=1 in formula 2,2,3 ...., N, d
^{a} _{k}represent the current actual health status of k evaluation object, if this evaluation object is support cable, so a d in cable system
^{a} _{k}represent its current actual damage, d
^{a} _{k}be to represent not damaged at 0 o'clock, while being 100%, represent that this support cable thoroughly loses loadbearing capacity, between 0 and 100% time, represent to lose the loadbearing capacity of corresponding proportion; If this evaluation object is load, so a d
^{a} _{k}represent the actual change amount of this load; So according to the current actual damage vector of evaluation object d
^{a}can define the impaired and degree of injury of which support cable, define which load the numerical value that changes and change has occurred; So far this method has realized and has rejected damaged cable identification impact, Cable Structure that generalized displacement of support, load change 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, load change amount;
M. get back to e step, start to be walked by e the circulation next time of m step.
Beneficial effect: this method has realized two kinds of functions that existing method can not possess, respectively: one, in the time of Cable Structure generation generalized displacement of support, when the load of bearing in structure and structure (environment) temperature variation, can reject Cable Structure generalized displacement of support, load change 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, in identifying damaged cable, can also identify the variation of load simultaneously, and this method can be rejected the impact that Cable Structure generalized displacement of support, structure temperature variation and support cable health status change, and realizes the correct identification of load change degree.
Embodiment
This method adopts a kind of algorithm, and this algorithm is for identifying the variation of damaged cable and load.When concrete enforcement, the following step is the one in the various steps that can take.
The first step: the quantity of first confirming the load that may change that Cable Structure bears.The feature of the load of bearing according to Cable Structure, confirm wherein " load likely changing ", or all load is considered as " load likely changing ", if total JZW the load that may change, the variable quantity that this method is expressed " load likely changing " by the intensity of variation of identification this JZW " load likely changing ".
If the quantity sum of the quantity of the support cable of Cable Structure and JZW " load likely changing " is N.For sake of convenience, it is " evaluation object " that this method unitedly calls evaluated support cable and " load likely changing ", total N evaluation object.Give evaluation object serial number, this numbering will be used 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 abovementioned 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 used 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 " by the step of technical scheme regulation.
Second step: set up initial mechanical calculating benchmark model A
_{o}.
In Cable Structure completion, or setting up before health monitoring systems, calculating " Cable Structure steady temperature data " according to " the temperature survey calculating method of the Cable Structure of this method " measurement (can measure by conventional thermometry, for example use thermal resistance to measure), " Cable Structure steady temperature data " now use vector T
_{o}represent, be called initial Cable Structure steady temperature data vector T
_{o}.Obtain T in actual measurement
_{o}time, namely at the synchronization in moment that obtains 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 obtaining the synchronization in moment of soandso Cable Structure steady temperature data vector such as (such as initial or current) according to following method, use soandso method measurement to calculate the data of the monitored amount of soandso measured amount (all monitored amount of for example Cable Structure): (to comprise the temperature of Cable Structure place environment in survey record temperature, 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 soandso measured amount of survey record (all monitored amount of for example Cable Structure) data.Once determine the moment that obtains Cable Structure steady temperature data, for example, be just called and obtaining the synchronization in moment of Cable Structure steady temperature data with the data of the monitored amount of soandso measured amount (all monitored amount of Cable Structure) of moment synchronization that obtain Cable Structure steady temperature data so, use soandso method to measure the data of the monitored amount of soandso 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 uses.
Obtain initial Cable Structure steady temperature data vector T at Actual measurement
_{o}time, namely obtaining the synchronization in moment of Cable Structure steady temperature data, by the method for technical scheme regulation, use conventional method Actual measurement obtains the Actual measurement data of Cable Structure.Initial Cable Structure bearing generalized coordinate data form initial Cable Structure bearing generalized coordinate vector U
_{o}.Data and the Cable Structure load measurement data of utilizing the Nondestructive 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
_{o}represent that Cable Structure is (with initial mechanical calculating benchmark model A
_{o}represent) the initial health of evaluation object.Utilize the Nondestructive Testing Data of the design drawing, asconstructed drawing of Cable Structure and the measured data of initial Cable Structure, support cable, temperature variant physical and mechanical properties parameter, the initial Cable Structure bearing generalized coordinate vector U of various materials that Cable Structure is used
_{o}with 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}.T
_{o}, U
_{o}and d
_{o}a
_{o}parameter, C
_{o}by A
_{o}mechanics Calculation result composition.
The 3rd step: set up for the first time current initial mechanical calculating benchmark model A
^{t} _{o}, the current initial value of monitored amount vector C
^{t} _{o}" current initial Cable Structure steady temperature data vector T
^{t} _{o}", concrete grammar is: at initial time, set up for the first time current initial mechanical calculating benchmark model A
^{t} _{o}with the current initial value vector of monitored amount C
^{t} _{o}time, A
^{t} _{o}just equal A
_{o}, C
^{t} _{o}just equal C
_{o}, A
^{t} _{o}corresponding " Cable Structure steady temperature data " are designated as " current initial Cable Structure steady temperature data vector T
^{t} _{o}", (namely set up for the first time A at initial time
^{t} _{o}time), T
^{t} _{o}just equal T
_{o}, vector T
^{t} _{o}definition mode and vector T
_{o}definition mode identical.Corresponding to the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}the current initial Cable Structure bearing generalized coordinate vector U of Cable Structure bearing generalized coordinate data compositions
^{t} _{o}; Set up for the first time the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}time, U
^{t} _{o}just equal U
_{o}.A
^{t} _{o}health status and the A of evaluation object
_{o}health status (the evaluation object initial damage vector d of evaluation object
_{o}represent) identical, A in cyclic process
^{t} _{o}the health status of evaluation object use all the time evaluation object initial damage vector d
_{o}represent.T
^{t} _{o}, U
^{t} _{o}and d
_{o}a
^{t} _{o}parameter, C
^{t} _{o}by A
^{t} _{o}mechanics Calculation result composition.
The 4th step: in Cable Structure military service process, 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 (is called " current cable structure steady temperature data vector T
^{t}", vector T
^{t}definition mode and vector T
_{o}definition mode identical).Obtain current cable structure steady temperature data vector T in actual measurement
^{t}time, namely obtaining current cable structure steady temperature data vector T
^{t}the synchronization in moment, actual measurement obtains the current measured value of all monitored amounts of Cable Structure, composition " monitored amount current value vector C ".Obtain current cable structure steady temperature data vector T in actual measurement
^{t}time, actual measurement obtains Cable Structure bearing generalized coordinate current data, all data composition current cable structure actual measurement bearing generalized coordinate vector U
^{t}.
The 5th step: according to current cable structure actual measurement bearing generalized coordinate vector U
^{t}with current cable structure steady temperature data vector T
^{t}, upgrade where necessary current initial mechanical calculating benchmark model A
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, the current initial value of monitored amount vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o}.Obtain current cable structure actual measurement bearing generalized coordinate vector U in the 4th step actual measurement
^{t}with current cable structure steady temperature data vector T
^{t}after, compare respectively U
^{t}and U
^{t} _{o}, T
^{t}and T
^{t} _{o}if, U
^{t}equal U
^{t} _{o}and T
^{t}equal T
^{t} _{o}, do not need A
^{t} _{o}, U
^{t} _{o}and T
^{t} _{o}upgrade, otherwise need to be to A
^{t} _{o}, U
^{t} _{o}and T
^{t} _{o}upgrade, update method is undertaken by the step of technical scheme regulation.
The 6th step: at current initial mechanical calculating benchmark model A
^{t} _{o}basis on, carry out several times Mechanics Calculation by the step of technical scheme regulation, obtain Cable Structure unit damage monitored numerical quantity transformation matrices Δ C and the vectorial D of evaluation object unit change by calculatings
_{u}.Concrete, if this evaluation object is a support cable in cable system, so just suppose that this support cable is at vectorial d
_{o}on the basis of the existing damage of this support cable representing, increase again unit damage (for example getting 5%, 10%, 20% or 30% equivalent damage is unit damage), if this evaluation object is a load, just suppose that this load is at vectorial d
_{o}on the basis of the existing variable quantity of this load representing, increasing load unit changes (if this load is distributed load again, and this distributed load is line distributed load, load unit changes can get 1kN/m, 2kN/m, 3kN/m or 1kNm/m, 2kNm/m, 3kNm/m etc. for unit change; If this load is distributed load, and this distributed load is face distributed load, and load unit changes can get 1MPa, 2MPa, 3MPa or 1kNm/m
^{2}, 2kNm/m
^{2}, 3kNm/m
^{2}deng being unit change; If this load is centrepoint load, and this centrepoint load is couple, and load unit changes can get 1kNm, 2kNm, 3kNm etc. for unit change; If this load is centrepoint load, and this centrepoint load is concentrated force, and load unit changes can get 1kN, 2kN, 3kN etc. for unit change; If this load is volume load, load unit changes can get 1kN/m
^{3}, 2kN/m
^{3}, 3kN/m
^{3}deng being unit change).
The 7th step: set up linear relationship error vector e and vectorial g.Utilize data (the current initial value vector of monitored amount C above
^{t} _{o}, unit damage monitored numerical quantity transformation matrices Δ C), when the 6th step is calculated each time, only have in evaluation object the increase unit damage of an evaluation object or load unit to change D calculating each time hypothesis
_{uk}the evaluation object that increases unit damage or load unit variation in calculating is each time different from the evaluation object that increases unit damage or load unit variation in other calculating, calculate each time the current value of all utilizing mechanics method (for example adopting finite element method) to calculate all monitored amounts in Cable Structure, when calculating each time a monitored amount calculation current vector C of composition, calculate each time vectorial d of damage of composition, originally walk out of existing damage vector d only in this step use, damage in all elements of vectorial d and only have the numerical value of an element to get D
_{uk}, the numerical value of other element gets 0, damages coding rule and the vectorial d of the element of vectorial d
_{o}the coding rule of element identical; By C, C
^{t} _{o}, Δ C, D
_{u}, d brings formula (1) into, obtains a linear relationship error vector e, calculates each time a linear relationship error vector e; There is N evaluation object just to have N calculating, just there is N linear relationship error vector e, will this N linear relationship error vector e obtain a vector after being added, the new vector that each element of this vector is obtained after divided by N is exactly final linear relationship error vector e.Vector g equals final error vector e.
In formula (1), abs () is the function that takes absolute value, and each vectorial element of trying to achieve in bracket is taken absolute value.
The 8th step: the hardware components of pass line structural healthy monitoring system.Hardware components at least comprises: monitored amount monitoring system (for example, 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 the signal monitoring is transferred to signal (data) collector by monitoring system; 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; In the time monitoring evaluation object health status and change, computer control communication panalarm is reported to the police to the personnel of monitor staff, owner and (or) appointment.
The 9th step: by current monitored amount initial value vector C
^{t} _{o}, unit damage monitored numerical quantity transformation matrices Δ C, evaluation object unit change vector D
_{u}parameter is kept on the hard disc of computer of operation health monitoring systems software in the mode of data file.
The tenth step: establishment installation and operation this method system software 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 11 step: the monitored amount current value vector of foundation C is with the current initial value vector of monitored amount C
^{t} _{o}, unit damage monitored numerical quantity transformation matrices Δ C, evaluation object unit change vector D
_{u}and the vectorial d(of the current name damage of evaluation object is made up of all Suo Dangqian name amount of damage) between the linear approximate relationship (formula (2)) that exists, calculate the noninferior solution of the vectorial d of the current name damage of evaluation object according to multiobjective optimization algorithm, namely with reasonable error but can determine more exactly the position of damaged cable and the solution of nominal degree of injury thereof from all ropes.
Can adopt Objective Programming (Goal Attainment Method) in multiobjective optimization algorithm to solve formula (2) and obtain the vectorial d of current damage.
The 12 step: utilize the current actual damage vector of evaluation object d
^{a}k element d
^{a} _{k}with evaluation object initial damage vector d
_{o}k element d
_{ok}k the element d with the vectorial d of the current name damage of evaluation object
_{k}between relation, calculate the current actual damage of evaluation object vector d
^{a}all elements.
D
^{a} _{k}represent the current actual health status of k evaluation object, if this evaluation object is support cable, so a d in cable system
^{a} _{k}represent its current actual damage, d
^{a} _{k}be to represent not damaged at 0 o'clock, while being 100%, represent that this support cable thoroughly loses loadbearing capacity, between 0 and 100% time, represent to lose the loadbearing capacity of corresponding proportion; If this evaluation object is a load, formula (15), d are so shown in its definition
^{a} _{k}represent that it is with respect to setting up initial mechanical calculating benchmark model A
_{o}time the structure corresponding load of bearing variable quantity; So according to the current actual damage vector of evaluation object d
^{a}can define the impaired and degree of injury of which support cable, can define which load variation and numerical value thereof have occurred simultaneously.
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, the computing machine automatic operation communication panalarm in health monitoring systems is reported to the police to the personnel of monitor staff, owner and (or) appointment.
The 15 step: get back to the 4th step, start the circulation by the 4th step to the 15 steps.
Claims (1)
1. generalized displacement strain monitoring damaged cable load recognition method, 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 load, establishes the quantity of evaluated support cable and the quantity sum of 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 used 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 specifying, 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 used for generating vector sum matrix in subsequent step, and " the whole monitored strain data of Cable Structure " is made up of abovementioned 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, must not be greater than 30 minutes to the time interval between any twice measurement of same amount RealTime Monitoring, the moment of survey record data is called the physical record data moment; The external force that object, structure are born can be described as load, and load comprises face load and volume load; Face load claims again surface load, is the load that acts on body surface, comprises two kinds of centrepoint load and distributed loads; Volume load is that continuous distribution is in the load of interior of articles each point, including the deadweight and inertial force of object; Centrepoint load is divided into two kinds of concentrated force and concentrated couples, comprising in the coordinate system of Descartes's rectangular coordinate in tying up to, a concentrated force can resolve into three components, same, a concentrated couple also can resolve into three components, if load is actually centrepoint load, in the method a concentrated force component or a concentrated couple component being counted or added up is a load, and the now variation of load is embodied as the variation of a concentrated force component or a concentrated couple component; Distributed load is divided into line distributed load and face distributed load, and the description of distributed load at least comprises the zone of action of distributed load and the size of distributed load, and the size of distributed load is expressed by distribution intensity, and distribution intensity is expressed by distribution characteristics and amplitude; If load is actually distributed load, when this method is talked about the variation of load, in fact refer to the change of the amplitude of distributed load distribution intensity, and the distribution characteristics of the zone of action of all distributed loads and distribution intensity is constant; Comprising in the coordinate system of Descartes's rectangular coordinate in tying up to, a distributed load can be resolved into three components, if the amplitude of the distribution intensity separately of three components of this distributed load changes, and the ratio changing is all not identical, so in the method three components of this distributed load being counted or added up is three distributed loads, and now load just represents the onecomponent of distributed load; Volume load be continuous distribution in the load of interior of articles each point, the description of volume load at least comprises the zone of action of volume load and the size of volume load, the size of volume load is expressed by distribution intensity, distribution intensity is expressed by distribution characteristics and amplitude; If load is actually volume load, actual treatment is the change of the amplitude of volume load distribution intensity in the method, and the distribution characteristics of the zone of action of all volume load and distribution intensity is constant, while now mentioning in the method the change of load, in fact refer to the change of the amplitude of the distribution intensity of volume load, now, the load changing refers to the volume load that the amplitude of those distribution intensities changes; Comprising in the coordinate system of Descartes's rectangular coordinate in tying up to, one individual stow lotus can be resolved into three components, if the amplitude of the distribution intensity separately of three components of this volume load changes, and the ratio changing is all not identical, and so in the method three components of this volume load being counted or added up is three distributed loads;
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, asconstructed 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 obtain each cloudy day in T cloudy day 0 after the sunrise moment next day highest temperature and the lowest temperature between 30 minutes, the sunrise moment on the meteorology that the sunrise moment refers to base area revolutions and the rule that revolves round the sun is definite, do not represent necessarily can see the same day sun, can inquire about data or calculate sunrise moment of each required day by conventional meteorology, each cloudy day 0 after the sunrise moment next day highest temperature between 30 minutes deduct the maximum temperature difference that the lowest temperature is called this cloudy daily temperature, there is T cloudy day, just there is the maximum temperature difference of 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, be designated as Δ T with reference to temperature difference per day
_{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}, get Δ T for convenience of narration
_{h}unit 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, the temperature of this R Cable Structure surface point will be obtained by actual measurement below, 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, obtain the temperature of this R Cable Structure surface point by Calculation of Heat Transfer, 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 least choose two points at the intersection place on surface level and Cable Structure surface, from the outer normal of selected point straw line body structure surface, all outer normal directions of choosing are called " measuring the direction of Cable Structure along 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, measure Cable Structure along each and be no less than three points along direction uniform choosing in Cable Structure of the Temperature Distribution of wall thickness, 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 the direction of Cable Structure along 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 the direction of Cable Structure along the Temperature Distribution of wall thickness, direction along each measurement Cable Structure along the Temperature Distribution of wall thickness has been chosen E point in Cable Structure, 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 the point of Cable Structure along the temperature profile data of thickness ", to obtain by actual measurement the temperature of this HBE " measuring the point of Cable Structure along the temperature profile data of thickness " below, 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, obtain this HBE by Calculation of Heat Transfer and measure the temperature of Cable Structure along 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, measure temperature in Cable Structure location according to meteorology and require to choose a position, will obtain the temperature of the Cable Structure place environment that meets the requirement of meteorology measurement temperature in this position actual measurement, in the onsite spaciousness of Cable Structure, unobstructed place chooses a position, this position should each of the whole year day can obtain this ground the most sufficient sunshine of getable this day, at the flat board of 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 each of the whole year day can obtain one flat plate on this ground the most sufficient sunshine of getable this day, the nonsunny slope of reference plate is covered with insulation material, RealTime Monitoring is obtained to the temperature of the sunny slope of reference plate,
B2: RealTime Monitoring obtains R Cable Structure surface temperature measured data of abovementioned R Cable Structure surface point, RealTime Monitoring obtains the temperature profile data of previously defined Cable Structure along thickness simultaneously, and RealTime Monitoring obtains the temperature record of the Cable Structure place environment that meets the requirement of meteorology measurement temperature simultaneously, obtain being carved at sunrise the same day temperature measured data sequence of the Cable Structure place environment between 30 minutes after sunrise moment next day by RealTime Monitoring, 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 30 minutes after the sunrise moment next day same day, find maximum temperature and minimum temperature in the temperature measured data sequence of Cable Structure place environment, deduct and be carved at sunrise the maximum temperature difference between 30 minutes after sunrise moment next day on same day that minimum temperature obtains Cable Structure place environment by the maximum temperature in the temperature measured data sequence of Cable Structure place environment, be called environment maximum temperature difference, be designated as Δ T
_{emax}, temperature measured data sequence by Cable Structure place environment obtains the temperature of Cable Structure place environment about the rate of change of time by conventional mathematical computations, and this rate of change is also along with the time changes, obtain being carved at sunrise the same day measured data sequence of the temperature of the sunny slope of the reference plate between 30 minutes after sunrise moment next day by RealTime Monitoring, the measured data sequence of the temperature of the sunny slope of reference plate is arranged according to time order and function order by the measured data that was carved at sunrise the temperature of the sunny slope of the reference plate between 30 minutes after the sunrise moment next day same day, find maximum temperature and minimum temperature in the measured data sequence of temperature of the sunny slope of reference plate, deduct and be carved at sunrise the maximum temperature difference between 30 minutes after sunrise moment next day on same day that minimum temperature obtains the temperature of the sunny slope of reference plate by the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate, be called reference plate maximum temperature difference, be designated as Δ T
_{pmax}, obtain being carved at sunrise the same day Cable Structure surface temperature measured data sequence of all R Cable Structure surface points between 30 minutes after sunrise moment next day by RealTime Monitoring, 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 is arranged according to time order and function order by being carved at sunrise the Cable Structure surface temperature measured data between 30 minutes after the sunrise moment next day same day of a Cable Structure surface point, find maximum temperature and minimum temperature in each Cable Structure surface temperature measured data sequence, deduct and be carved at sunrise the maximum temperature difference between 30 minutes after sunrise moment next day on same day that minimum temperature obtains the temperature of each Cable Structure surface point by the maximum temperature in each Cable Structure surface temperature measured data sequence, there is R Cable Structure surface point just to have to be carved at sunrise R the same day maximum temperature difference numerical value between 30 minutes after sunrise moment next day, maximal value is wherein called Cable Structure surface maximum temperature difference, be designated as Δ T
_{smax}, obtain the temperature of each Cable Structure surface point about the rate of change of time by each Cable Structure surface temperature measured data sequence by conventional mathematical computations, the temperature of each Cable Structure surface point about the rate of change of time also along with the time changes, obtain being carved at sunrise the same day after sunrise moment next day between 30 minutes by RealTime Monitoring, at synchronization, after HBE " Cable Structure is along the temperature profile data of thickness ", calculate the sea level elevation place that chooses at each and amount 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 ", choose 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, Section 1 condition be obtain Cable Structure steady temperature data moment after being carved at sunset sunrise moment next day between 30 minutes on same day, the sunset moment refers to the sunset moment on base area revolutions and the definite meteorology of revolution rule, can inquire about data or calculate sunset moment of each required day by conventional meteorology, the a condition of Section 2 condition be after being carved at sunrise sunrise moment next day on same day between 30 minutes during this period of time in, reference plate maximum temperature difference Δ T
_{pmax}with Cable Structure surface maximum temperature difference Δ T
_{smax}all be not more than 5 degrees Celsius, the b condition of Section 2 condition be after being carved at sunrise sunrise moment next day on same day between 30 minutes during this period of time in, measure the environment maximum error Δ T that calculates above
_{emax}be not more than with reference to temperature difference per day Δ T
_{r}, and reference plate maximum temperature difference Δ T
_{pmax}after deducting 2 degrees Celsius, be not more than Δ T
_{emax}, and Cable Structure surface maximum temperature difference Δ T
_{smax}be not more than Δ T
_{pmax}, only need meet in a condition of Section 2 and b condition one is just called and meets Section 2 condition, Section 3 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, Section 4 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, Section 5 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 minimal value between 30 minutes after the sunrise moment next day same day, Section 6 condition is at the moment that obtains Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T
_{tmax}be not more than 1 degree Celsius, this method is utilized abovementioned six conditions, any one in following three kinds of moment is called to " the mathematics moment that obtain Cable Structure steady temperature data ", the first moment is to meet Section 1 in abovementioned " condition relevant to the moment that determines the to obtain Cable Structure steady temperature data " moment to Section 5 condition, the second moment is the moment that only meets the Section 6 condition in abovementioned " condition relevant to the moment that determines acquisition Cable Structure steady temperature data ", the third moment is to meet Section 1 in abovementioned " condition relevant to the moment that determines the to obtain Cable Structure steady temperature data " moment to Section 6 condition simultaneously, be exactly in this method when one in the physical record data moment when obtaining the mathematics moment of Cable Structure steady temperature data, the moment that obtains Cable Structure steady temperature data is exactly the mathematics moment that obtains Cable Structure steady temperature data, be not any moment in the physical record data moment in this method if obtain the mathematics moment of Cable Structure steady temperature data, getting this method is the moment that obtains Cable Structure steady temperature data close to moment of those physical record data in the mathematics moment that obtains Cable Structure steady temperature data, this method will be used the amount at the moment survey record that obtains Cable Structure steady temperature data to carry out the relevant health monitoring analysis of Cable Structure, 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. the not temporal evolution of Cable Structure temperature in this moment, and this moment is exactly " obtaining the moment of Cable Structure steady temperature data " of this method, 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, obtain obtaining the Temperature Distribution of Cable Structure in moment of Cable Structure steady temperature data by conventional Calculation of Heat Transfer, 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 the accounting temperature of Cable Structure selected HBE " measuring the point of Cable Structure along the temperature profile data of thickness " above, the accounting temperature of HBE " measuring the point of Cable Structure along the temperature profile data of thickness " is called " HBE Cable Structure is along thickness temperature computation data ", in the time of 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 ", get " R Cable Structure surface point " on the surface of Cable Structure time, 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, when the temperature of any point on Cable Structure surface be by " R Cable Structure surface point " in 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
_{h}the numerical value obtaining, gets Δ T for convenience of narration
_{h}unit 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 sunshineduration 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 sunshineduration in Cable Structure,
C. directly measure according to " the temperature survey calculating method of the Cable Structure of this method " the Cable Structure steady temperature data that calculate 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 uses, obtain T in actual measurement
_{o}time, namely obtaining initial Cable Structure steady temperature data vector T
_{o}the synchronization in moment, directly measure the measured data that calculates initial Cable Structure, the measured data of initial Cable Structure is to comprise Cable Structure centrepoint 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 angledata, 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 generalized coordinate data, in obtaining the measured data of initial Cable Structure, measurement calculates the data of the health status that can express support cable including the Nondestructive Testing Data of 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
_{o}the coding rule of coding rule and M monitored amount identical, utilize support cable initial health data and Cable Structure load measurement data to set up evaluation object initial damage vector d
_{o}, vectorial d
_{o}represent with initial mechanical calculating benchmark model A
_{o}the initial health of the evaluation object of the Cable Structure representing, evaluation object initial damage vector d
_{o}element number equal N, d
_{o}element and evaluation object be onetoone relationship, vectorial d
_{o}the coding rule of element identical with the coding rule of evaluation object, if d
_{o}evaluation object corresponding to some elements be support cable, so a d in cable system
_{o}the 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 loadbearing capacity, lost the loadbearing capacity of corresponding proportion if its numerical value between 0 and 100%, represents this support cable, if d
_{o}evaluation object corresponding to some elements be some load, in this method, get d
_{o}this element numerical value be 0, the initial value that represents the variation of this load is 0, if while not having the Nondestructive Testing Data of support cable and other can express the data of health status of support cable, or can think that structure original state is not damaged during without relaxed state, vectorial d
_{o}in the 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 centrepoint 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, asconstructed drawing and initial Cable Structure, initial Cable Structure bearing generalized coordinate vector U
_{o}, initial Cable Structure steady temperature data vector T
_{o}with 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
_{o}the 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
_{o}evaluation object initial damage vector d for evaluation object health status
_{o}represent; Corresponding to A
_{o}monitored amount initial value vector C for the initial value of all monitored amounts
_{o}represent; Set up for the first time the current initial mechanical calculating benchmark model A of the Cable Structure that counts " Cable Structure steady temperature data "
^{t} _{o}, the current initial value of monitored amount vector C
^{t} _{o}" current initial Cable Structure steady temperature data vector T
^{t} _{o}"; Set up for the first time the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}with the current initial value vector of monitored amount C
^{t} _{o}time, the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}just equal the initial mechanical calculating benchmark model A of Cable Structure
_{o}, the current initial value vector of monitored amount C
^{t} _{o}just equal monitored amount initial value vector C
_{o}; A
^{t} _{o}corresponding " Cable Structure steady temperature data " are called " current initial Cable Structure steady temperature data ", are designated as " current initial Cable Structure steady temperature data vector T
^{t} _{o}", set up for the first time the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}time, T
^{t} _{o}just equal T
_{o}; Corresponding to the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}the current initial Cable Structure bearing generalized coordinate vector U of Cable Structure bearing generalized coordinate data compositions
^{t} _{o}, set up for the first time the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}time, U
^{t} _{o}just equal U
_{o}; A
^{t} _{o}initial health and the A of evaluation object
_{o}the health status of evaluation object identical, also use evaluation object initial damage vector d
_{o}represent A in cyclic process below
^{t} _{o}the initial health of evaluation object use all the time evaluation object initial damage vector d
_{o}represent; T
_{o}, U
_{o}and d
_{o}a
_{o}parameter, by A
_{o}initial value and the C of all monitored amounts of obtaining of Mechanics Calculation result
_{o}the initial value of all monitored amounts that represent is identical, therefore also can say C
_{o}by A
_{o}mechanics Calculation result composition; T
^{t} _{o}, U
^{t} _{o}and d
_{o}a
^{t} _{o}parameter, C
^{t} _{o}by A
^{t} _{o}mechanics Calculation result composition;
E. from entering the circulation that is walked m step by e here; In structure military service process, constantly according to " the temperature survey calculating method of the Cable Structure of this method " the constantly current data of Actual measurement acquisition " Cable Structure steady temperature data ", the current data of " Cable Structure steady temperature data " is called " current cable structure steady temperature data ", is designated as " current cable structure steady temperature data vector T
^{t}", vector T
^{t}definition mode and vector T
_{o}definition mode identical; Obtain current cable structure steady temperature data vector T in actual measurement
^{t}synchronization, actual measurement obtains Cable Structure bearing generalized coordinate current data, all Cable Structure bearing generalized coordinate current datas composition current cable structures actual measurement bearing generalized coordinate vector U
^{t}, vectorial U
^{t}definition mode and vectorial U
_{o}definition mode identical;
F. according to current cable structure actual measurement bearing generalized coordinate vector U
^{t}with current cable structure steady temperature data vector T
^{t}, upgrade current initial mechanical calculating benchmark model A according to step f1 to f3
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, the current initial value of monitored amount vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o};
F1. compare respectively U
^{t}with U
^{t} _{o}, T
^{t}with T
^{t} _{o}if, U
^{t}equal U
^{t} _{o}and T
^{t}equal T
^{t} _{o}, A
^{t} _{o}, U
^{t} _{o}, C
^{t} _{o}and T
^{t} _{o}remain unchanged, otherwise need to follow these steps to A
^{t} _{o}, U
^{t} _{o}and T
^{t} _{o}upgrade;
F2. calculate U
^{t}with U
_{o}poor, U
^{t}with U
_{o}difference be exactly the generalized displacement of support of Cable Structure bearing about initial position, represent generalized displacement of support with generalized displacement of support vector V, V equals U
^{t}deduct U
_{o}, between the element in generalized displacement of support vector V and generalized displacement of support component, be onetoone 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; Calculate T
^{t}with T
_{o}poor, T
^{t}with T
_{o}difference be exactly the variations of current cable structure steady temperature data about initial Cable Structure steady temperature data, T
^{t}with T
_{o}poor represent with steady temperature change vector S, S equals T
^{t}deduct T
_{o}, S represents the variation of Cable Structure steady temperature data;
F3. first to A
_{o}in 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
_{o}in Cable Structure apply temperature variation, the numerical value of the temperature variation applying is just taken from steady temperature change vector S, to A
_{o}middle Cable Structure bearing applies generalized displacement of support constraint and to A
_{o}in the temperature variation that applies of Cable Structure after obtain the current initial mechanical calculating benchmark model A that upgrades
^{t} _{o}, upgrade A
^{t} _{o}time, U
^{t} _{o}all elements numerical value is also used U
^{t}all elements numerical value is corresponding to be replaced, and has upgraded U
^{t} _{o}, T
^{t} _{o}all elements numerical value is also used T
^{t}corresponding replacement of all elements numerical value, upgraded T
^{t} _{o}, so just obtained correctly corresponding to A
^{t} _{o}t
^{t} _{o}and U
^{t} _{o}; Upgrade C
^{t} _{o}method be: when upgrade A
^{t} _{o}after, obtain A by Mechanics Calculation
^{t} _{o}in concrete numerical value all monitored amounts, current, these concrete numerical value compositions C
^{t} _{o}; A
^{t} _{o}the initial health of support cable use all the time evaluation object initial damage vector d
_{o}represent;
G. at current initial mechanical calculating benchmark model A
^{t} _{o}basis on carry out several times Mechanics Calculation according to step g 1 to g4, obtain Cable Structure unit damage monitored numerical quantity transformation matrices Δ C and evaluation object unit change vector D by calculating
_{u};
G1. Cable Structure unit damage monitored numerical quantity transformation matrices Δ C constantly updates, and is upgrading current initial mechanical calculating benchmark model A
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, the current initial value of monitored amount vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o}afterwards, must then upgrade Cable Structure unit damage monitored numerical quantity transformation matrices Δ C and evaluation object unit change vector D
_{u};
_{g}2. at the current initial mechanical calculating benchmark model A of Cable Structure
^{t} _{o}basis 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; According to the coding rule of evaluation object, calculate successively; Calculate each time hypothesis and only have an evaluation object on the basis of original damage or load, to increase again unit damage or load unit variation, concrete, if this evaluation object is a support cable in cable system, so just suppose that this support cable is at vectorial d
_{o}on the basis of the existing damage of this support cable representing, increase again unit damage, if this evaluation object is a load, just suppose that this load is at vectorial d
_{o}on the basis of the existing variable quantity of this load representing, increase again load unit and change, use D
_{uk}the unit damage or the load unit that record this increase change, and wherein k represents the numbering of the evaluation object that increases unit damage or load unit variation, D
_{uk}evaluation object unit change vector D
_{u}an element, evaluation object unit change vector D
_{u}coding rule and the vectorial d of element
_{o}the coding rule of element identical; The evaluation object that increases unit damage or load unit variation in calculating is each time different from the evaluation object that increases unit damage or load unit variation in other calculating, calculate each time the current calculated value that all utilizes mechanics method to calculate all monitored amounts of Cable Structure, a monitored amount calculation current vector of current calculated value composition of all monitored amounts that calculate each time, the element coding rule of monitored amount calculation current vector and monitored amount initial value vector C
_{o}element coding rule identical;
G3. the monitored amount calculation current vector calculating each time deducts the current initial value vector of monitored amount C
^{t} _{o}obtain a vector, then each element of this vector is calculated to unit damage or the load unit variation numerical value supposed divided by this time, obtain a monitored amount unit change vector, have N evaluation object just to have N monitored amount unit change vector;
G4. by this N monitored amount unit change vector according to the coding rule of N evaluation object, composition has the Cable Structure unit damage monitored numerical quantity transformation matrices Δ C that N is listed as successively; Each of Cable Structure unit damage monitored numerical quantity transformation matrices Δ C is listed as corresponding to a monitored amount unit change vector; Every a line of Cable Structure unit damage monitored numerical quantity transformation matrices Δ C is the different unit change amplitude in the time that different evaluation objects increase unit damage or load unit variation corresponding to same monitored amount; Coding rule and the vectorial d of the row of Cable Structure unit damage monitored numerical quantity transformation matrices Δ C
_{o}the coding rule of element identical, the coding rule of the row of Cable Structure unit damage monitored numerical quantity transformation matrices Δ C is identical with the coding rule of M monitored amount;
H. obtain current cable structure steady temperature data vector T in actual measurement
^{t}time, actual measurement obtains obtaining current cable structure steady temperature data vector T
^{t}the current measured value of all monitored amounts of Cable Structure of synchronization in moment, form monitored amount current value vector C; The current initial value vector of monitored amount current value vector C and monitored amount C
^{t} _{o}with monitored amount initial value vector C
_{o}definition mode identical, the same monitored amount of element representation of three vectorial identical numberings is at concrete numerical value in the same time not;
I. define the vectorial d of the current name damage of evaluation object, the element number of the vectorial d of the current name damage of evaluation object equals the quantity of evaluation object, between the element of the vectorial d of the current name damage of evaluation object and evaluation object, be onetoone relationship, the element numerical value of the vectorial d of the current name damage of evaluation object represents nominal degree of injury or the nominal load variable quantity of corresponding evaluation object; Coding rule and the vectorial d of the element of vector d
_{o}the coding rule of element identical;
J. the monitored amount current value vector of foundation C is with the current initial value vector of monitored amount C
^{t} _{o}, the linear approximate relationship that exists between Cable Structure unit damage monitored numerical quantity transformation matrices Δ C and the vectorial d of the current name damage of evaluation object to be asked, this linear approximate relationship can be expressed as formula 1, other amount in formula 1 except d is known, solves formula 1 and just can calculate the vectorial d of the current name damage of evaluation object;
K. define the current actual damage vector of evaluation object d
^{a}, the current actual damage vector of evaluation object d
^{a}element number equal the quantity of evaluation object, the current actual damage vector of evaluation object d
^{a}element and evaluation object between be onetoone relationship, the current actual damage of evaluation object vector d
^{a}element numerical value represent actual damage degree or the real load variable quantity of corresponding evaluation object; Vector d
^{a}coding rule and the vectorial d of element
_{o}the coding rule of element identical;
L. the current actual damage vector of the evaluation object d that utilizes formula 2 to express
^{a}k element d
^{a} _{k}with evaluation object initial damage vector d
_{o}k element d
_{ok}k the element d with the vectorial d of the current name damage of evaluation object
_{k}between relation, calculate the current actual damage of evaluation object vector d
^{a}all elements;
K=1 in formula 2,2,3 ...., N, d
^{a} _{k}represent the current actual health status of k evaluation object, if this evaluation object is support cable, so a d in cable system
^{a} _{k}represent its current actual damage, d
^{a} _{k}be to represent not damaged at 0 o'clock, while being 100%, represent that this support cable thoroughly loses loadbearing capacity, between 0 and 100% time, represent to lose the loadbearing capacity of corresponding proportion; If this evaluation object is load, so a d
^{a} _{k}represent the actual change amount of this load; So according to the current actual damage vector of evaluation object d
^{a}can define the impaired and degree of injury of which support cable, define which load the numerical value that changes and change has occurred; So far this method has realized and has rejected damaged cable identification impact, Cable Structure that generalized displacement of support, load change 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, load change amount;
M. get back to e step, start to be walked by e the circulation next time of m step.
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CN104990750A (en) *  20150723  20151021  东南大学  Simplified method of recognizing damaged cable load through linear displacement hybrid monitoring 
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CN105067305A (en) *  20150723  20151118  东南大学  Simplified generalized displacement strainmonitoring damaged cable load identifying method 
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CN105067300A (en) *  20150723  20151118  东南大学  Simplified cableforcemonitoring defective cable load generalized displacement progressive identifying method 
CN105115763A (en) *  20150723  20151202  东南大学  Identification method for damaged cable and load through simplified monitoring of angular displacement and cable force 
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CN104990750A (en) *  20150723  20151021  东南大学  Simplified method of recognizing damaged cable load through linear displacement hybrid monitoring 
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CN105067355A (en) *  20150723  20151118  东南大学  Method for recognizing load of damaged cable based on streamlined strain monitoring process 
CN105067300A (en) *  20150723  20151118  东南大学  Simplified cableforcemonitoring defective cable load generalized displacement progressive identifying method 
CN105115763A (en) *  20150723  20151202  东南大学  Identification method for damaged cable and load through simplified monitoring of angular displacement and cable force 
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