CN102735471B  Generalized displacement of support temperature variation is based on the damaged cable recognition methods of strain monitoring  Google Patents
Generalized displacement of support temperature variation is based on the damaged cable recognition methods of strain monitoring Download PDFInfo
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 CN102735471B CN102735471B CN201210173759.0A CN201210173759A CN102735471B CN 102735471 B CN102735471 B CN 102735471B CN 201210173759 A CN201210173759 A CN 201210173759A CN 102735471 B CN102735471 B CN 102735471B
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Abstract
Generalized displacement of support temperature variation based on the damaged cable recognition methods of strain monitoring based on strain monitoring, the Mechanics Calculation benchmark model needing to upgrade Cable Structure is determined whether by monitoring generalized displacement of support, Cable Structure temperature and environment temperature, obtain the Mechanics Calculation benchmark model of the Cable Structure counting generalized displacement of support, Cable Structure temperature and environment temperature, the basis of this model calculates and obtains unit damage monitored amount transformation matrices.Calculate the noninferior solution of the current nominal fatigue vector of cable system with the linear approximate relationship existed between monitored amount current initial value vector, unit damage monitored amount transformation matrices, unit damage scalar sum cable system current nominal fatigue vector to be asked according to monitored amount current value vector, when having support displacement and temperature variation, position and the degree of injury thereof of damaged cable can be determined more exactly accordingly.
Description
Technical field
The structures such as cablestayed bridge, suspension bridge, trussframe structure have a common ground, be exactly that they have many parts bearing 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 only bears the rod member of tensile load for support unit, and such structure representation is " Cable Structure " by this method for simplicity.Along with the change of environment temperature, the temperature of Cable Structure also can change, and when Cable Structure temperature changes, there being generalized displacement of support, (such as generalized displacement of support refers to that bearing is along the angular displacement around X, Y, Z axis of the displacement of the lines of X, Y, Z axis and bearing, corresponding to generalized displacement of support, bearing generalized coordinate refers to that bearing is about X, Y, the coordinate of Z axis and bearing are about X, Y, the angular coordinate of Z axis) time, based on strain monitoring, this method identifies that the supporting system of Cable Structure (refers to all ropeway carryingropes, and all rod members only bearing tensile load play supporting role, for simplicity, whole support units of this class formation are collectively referred to as " cable system " by this patent, but in fact cable system not only refers to support cable, also the rod member only bearing tensile load is comprised, censure all ropeway carryingropes and all rod members only bearing tensile load play supporting role with " support cable " this noun in this method) in damaged cable (the impaired rod member only bearing tensile load is just referred to trussframe structure), belong to engineering structure health monitoring field.
Background technology
The health status of support cable system changes after (such as damaging), the change of the measurable parameter of structure can be caused, the distortion of such as Cable Structure or strain can change, in fact the change strained contains the health status information of cable system, that is structural strain data can be utilized to judge the health status of structure, damaged cable can be identified based on strain monitoring (monitored strain is called " monitored amount " by this method, after mention " monitored amount " just refer to monitored strain).Monitored amount is except being subject to the impact of cable system health status; also can be subject to the impact of Cable Structure temperature variation (usually can occur) and Cable Structure generalized displacement of support (usually can occur); change with under the condition of Cable Structure bearing generation generalized displacement in Cable Structure temperature; if can based on the identification monitoring of monitored amount being realized to the support cable to unsoundness problem; to the safety of Cable Structure, there is important value, also do not have a kind of disclosed, effective health monitoring systems and method to solve this problem at present.
When Cable Structure has generalized displacement of support and temperature variation, in order to can monitoring reliably be had to the health status of the cable system of Cable Structure and judge, must have one can rationally effectively set up each monitored amount change with ropes all in cable system health status between the method for relation, the health monitoring systems set up based on the method can provide the health evaluating of more believable cable system.
Summary of the invention
Technical matters: the object of this method is when Cable Structure has generalized displacement of support and temperature variation, for the health monitoring problem of cable system in Cable Structure, disclose a kind of based on strain monitoring, health monitor method that cable system in Cable Structure can be monitored rationally and effectively.
Technical scheme: this method is made up of three parts.Method, knowledge based storehouse (containing parameter) and actual measurement the cable system health state evaluation method of monitored amount, the software and hardware part of health monitoring systems of setting up knowledge base needed for cable system health monitoring systems and parameter respectively.
The Part I of this method: the method setting up knowledge base needed for cable system health monitoring systems and parameter.Specific as follows:
1. first determine " the temperature survey calculating method of the Cable Structure of this method ".Temperature due to Cable Structure may be change, the temperature of the different parts of such as Cable Structure changes along with the change of intensity of sunshine, along with the change of environment temperature changes, the surface of Cable Structure may be time dependent with inner temperature sometimes, the surface of Cable Structure may be different from inner temperature, the surface of Cable Structure is time dependent with inner temperature difference, this just makes the Mechanics Calculation of Cable Structure when considering temperature conditions and monitoring quite complicated, for simplifying problem, reduce calculated amount and reduce and measure cost, especially in order to improve computational accuracy, this method proposes " the temperature survey calculating method of the Cable Structure of this method ", specific as follows:
The first step, inquiry or actual measurement obtain the temperature variant thermal conduction study parameter of environment residing for Cable Structure composition material and Cable Structure, utilize the geometry measured data of the design drawing of Cable Structure, asconstructed drawing and Cable Structure, utilize these data and parameter to set up the Thermodynamic calculation model of Cable Structure.Inquiry Cable Structure location is no less than the meteorological data in recent years of 2 years, the statistics cloudy quantity obtained is during this period of time designated as T cloudy day, statistics obtains 0 highest temperature after sunrise moment next day between 30 minutes and the lowest temperature at each cloudy day in T cloudy day, the sunrise moment refers to the sunrise moment on the meteorology that base area revolutions and revolution rule are determined, data can be inquired about or calculated sunrise moment of each required day by conventional meteorology, 0 highest temperature after sunrise moment next day between 30 minutes at each cloudy day deducts the maximum temperature difference that the lowest temperature is called the daily temperature at this cloudy day, there is T cloudy day, just there is the maximum temperature difference of the daily temperature at T cloudy day, the maximal value of getting in the maximum temperature difference of the daily temperature at T cloudy day is reference temperature difference per day, Δ T is designated as with reference to temperature difference per day
_{r}.Be no less than between inquiry Cable Structure location and Altitude Region, place temperature that the meteorological data in recent years of 2 years or actual measurement obtain environment residing for Cable Structure in time with delta data and the Changing Pattern of sea level elevation, calculate to be no less than 2 years between Cable Structure location and Altitude Region, place Cable Structure in recent years residing for the temperature of environment about the maximum rate of change Δ T of sea level elevation
_{h}, get Δ T for convenience of describing
_{h}unit be DEG C/m.The surface of Cable Structure is got " R Cable Structure surface point ", the temperature of this R Cable Structure surface point will be obtained below by actual measurement, claiming to survey the temperature data obtained is " R Cable Structure surface temperature measured data ", if utilize the Thermodynamic calculation model of Cable Structure, obtained the temperature of this R Cable Structure surface point by Calculation of Heat Transfer, just claim the temperature data that calculates for " R Cable Structure land surface pyrometer count certificate ".When the surface of Cable Structure is got " R Cable Structure surface point ", the quantity of " R Cable Structure surface point " describes later with the condition that must meet that distributes.From the minimum height above sea level residing for Cable Structure to most High aititude, in Cable Structure, uniform choosing is no less than three different sea level elevations, at the sea level elevation place that each is chosen, two points are at least chosen 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 chosen 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 in the shade the outer normal direction of the measurement Cable Structure chosen along the sunny slope outer normal direction and Cable Structure that must comprise Cable Structure in the direction of the Temperature Distribution of wall thickness, three points are no less than along each measurement Cable Structure along direction uniform choosing in Cable Structure of the Temperature Distribution of wall thickness, especially, along each, Cable Structure is measured for support cable and only gets a point along the direction of the Temperature Distribution of wall thickness, namely the temperature of the surface point of support cable is only measured, measure all temperature be selected a little, the temperature recorded 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 " to 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 have chosen the individual different sea level elevation of H, at each sea level elevation place, have chosen B and measure the direction of Cable Structure along the Temperature Distribution of wall thickness, in Cable Structure, E point is have chosen along each measurement Cable Structure along the direction of the Temperature Distribution of wall thickness, wherein H and E is not less than 3, B is not less than 2, especially, 1 is equaled for support cable E, what meter Cable Structure " measured the point of Cable Structure along the temperature profile data of thickness " adds up to HBE, the temperature of this HBE " measuring the point of Cable Structure along the temperature profile data of thickness " will be obtained below by actual measurement, claiming to survey the temperature data obtained is " HBE Cable Structure is along thickness temperature measured data ", if utilize the Thermodynamic calculation 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, the temperature data calculated just is claimed to be " HBE Cable Structure calculates data along thickness temperature ", the number temperature profile data at sea level elevation place " identical sea level elevation Cable Structure is along the temperature profile data of thickness " will chosen at each in this method ".Measure temperature in Cable Structure location according to meteorology to require to choose a position, obtain meeting the temperature that meteorology measures the Cable Structure place environment of temperature requirement by the actual measurement of this position, 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 this day getable, at the flat board of this position of sound production one piece of carbon steel material, be called reference plate, the one side of this reference plate on the sunny side, be called sunny slope, the sunny slope of reference plate is coarse with 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 this day getable, the nonsunny slope of reference plate is covered with insulation material, RealTime Monitoring is obtained the temperature of the sunny slope of reference plate.Must not be greater than 30 minutes to the time interval between any twice measurement of same amount RealTime Monitoring in this method, the moment of survey record data is called the physical record data moment.
Second step, 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 meeting the temperature record that meteorology measures the Cable Structure place environment of temperature requirement simultaneously, the temperature measured data sequence of the Cable Structure place environment after sunrise moment next day between 30 minutes is obtained being carved at sunrise the same 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 of the Cable Structure place environment after being carved into the sunrise moment next day same day at sunrise between 30 minutes, find the maximum temperature in the temperature measured data sequence of Cable Structure place environment and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains Cable Structure place environment after sunrise moment next day between 30 minutes is deducted by the maximum temperature in the temperature measured data sequence of Cable Structure place environment, be designated as Δ T
_{emax}, calculated the rate of change of temperature about the time of Cable Structure place environment by Conventional mathematical by the temperature measured data sequence of Cable Structure place environment, this rate of change is also along with time variations, the measured data sequence of the temperature of the sunny slope of the reference plate after sunrise moment next day between 30 minutes is obtained being carved at sunrise the same 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 of the temperature of the sunny slope of the reference plate after being carved into the sunrise moment next day same day at sunrise between 30 minutes, find the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains the temperature of the sunny slope of reference plate after sunrise moment next day between 30 minutes is deducted by the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate, be designated as Δ T
_{pmax}, the Cable Structure surface temperature measured data sequence of all R Cable Structure surface points after sunrise moment next day between 30 minutes is obtained being carved at sunrise the same day by RealTime Monitoring, R Cable Structure surface point is had 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 the Cable Structure surface temperature measured data after being carved into the sunrise moment next day same day of a Cable Structure surface point at sunrise between 30 minutes, find the maximum temperature in each Cable Structure surface temperature measured data sequence and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains the temperature of each Cable Structure surface point after sunrise moment next day between 30 minutes is deducted 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 designated as Δ T
_{smax}, calculated the rate of change of temperature about the time of each Cable Structure surface point by Conventional mathematical by each Cable Structure surface temperature measured data sequence, the temperature of each Cable Structure surface point about the rate of change of time also along with time variations.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 difference amounting to maximum temperature in BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " and minimum temperature at the sea level elevation place that each is chosen, the absolute value of this difference is called " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", have chosen H different sea level elevation just to have H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", the maximal value in this H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference " is claimed to be " Cable Structure thickness direction maximum temperature difference ", be designated as Δ T
_{tmax}.
3rd step, survey calculation obtains Cable Structure steady temperature data, first, determine the moment obtaining Cable Structure steady temperature data, the condition relevant to the moment determining to obtain Cable Structure steady temperature data has six, Section 1 condition is moment of obtaining Cable Structure steady temperature data between after being carved into sunrise moment next day at sunset between 30 minutes on same day, the sunset moment refers to the sunset moment on base area revolutions and the meteorology determined of revolution rule, can inquire about data or be calculated sunset moment of each required day by conventional meteorology, the a condition of Section 2 condition be after being carved into sunrise moment next day at sunrise between 30 minutes on same day 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 into sunrise moment next day at sunrise between 30 minutes on same day during this period of time in, the environment maximum error Δ T that survey calculation obtains 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}Δ T is not more than after deducting 2 degrees Celsius
_{emax}, and Cable Structure surface maximum temperature difference Δ T
_{smax}be not more than Δ T
_{pmax}, one of only need meet in a condition of Section 2 and b condition is just called and meets Section 2 condition, Section 3 condition is when obtaining Cable Structure steady temperature data, and 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, Section 4 condition is when obtaining Cable Structure steady temperature data, and 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, Section 5 condition is when obtaining 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 be carved into the minimal value after sunrise moment next day between 30 minutes the same day at sunrise, Section 6 condition is when obtaining Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T
_{tmax}be not more than 1 degree Celsius, this method utilizes abovementioned six conditions, any one in following three kinds of moment is called " the mathematics moment obtaining Cable Structure steady temperature data ", the first moment meets the moment of the Section 1 in abovementioned " condition relevant to the moment determining to obtain Cable Structure steady temperature data " to Section 5 condition, the second moment is moment of the Section 6 condition only met in abovementioned " condition relevant to determining to obtain moment of Cable Structure steady temperature data ", simultaneously the third moment meets the moment of the Section 1 in abovementioned " condition relevant to the moment determining to obtain Cable Structure steady temperature data " to Section 6 condition, when the mathematics moment obtaining Cable Structure steady temperature data is exactly one in this method in the physical record data moment, the moment obtaining Cable Structure steady temperature data is exactly the mathematics moment obtaining Cable Structure steady temperature data, if the mathematics moment obtaining Cable Structure steady temperature data is not any one moment in this method in the physical record data moment, then getting this method closest to moment of those physical record data in the mathematics moment obtaining Cable Structure steady temperature data is the moment obtaining Cable Structure steady temperature data, the amount being used in the moment survey record obtaining Cable Structure steady temperature data is carried out Cable Structure relevant health monitoring analysis by this method, this method is similar to thinks that the Cable Structure temperature field in the moment obtaining Cable Structure steady temperature data is in stable state, and namely the Cable Structure temperature in this moment does not change in time, 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 obtaining Cable Structure steady temperature data, utilize the Thermodynamic calculation model of Cable Structure, the Temperature Distribution of the Cable Structure in the moment obtaining Cable Structure steady temperature data is calculated by conventional heat transfer, now the temperature field of Cable Structure calculates by stable state, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculated comprises the accounting temperature of R Cable Structure surface point in Cable Structure, the accounting temperature of R Cable Structure surface point is called that R Cable Structure steadystate surface temperature calculates 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 calculates data along thickness temperature ", when R Cable Structure surface temperature measured data and R Cable Structure steadystate surface temperature calculate data correspondent equal, and when " HBE Cable Structure is along thickness temperature measured data " and " HBE Cable Structure calculates data along thickness temperature " correspondent equal, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculated is called " Cable Structure steady temperature data " in the method, " R Cable Structure surface temperature measured data " is now called " R Cable Structure steadystate 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 ", when the surface of Cable Structure is got " R Cable Structure surface point ", the quantity of " R Cable Structure surface point " must meet three conditions with distribution, first condition is when Cable Structure temperature field is in stable state, when the temperature of Cable Structure any point be on the surface by " R Cable Structure surface point " in obtain with the observed temperature linear interpolation of the Cable Structure point that this arbitrfary point is adjacent on the surface time, the error of the Cable Structure that linear interpolation the obtains temperature of this arbitrfary point and the Cable Structure actual temperature of this arbitrfary point on the surface is on the surface not more than 5%, Cable Structure surface comprises support cable surface, second condition is not less than 4 in the quantity of the point of same sea level elevation in " R Cable Structure surface point ", 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 DEG C 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 obtained, gets Δ T for convenience of describing
_{h}unit be DEG C/m, be m for convenience of describing the unit getting Δ h, " R Cable Structure surface point " along the definition of the adjacent between two Cable Structure surface point of sea level elevation refer to only consider sea level elevation time, in " R Cable Structure surface point ", there is not 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, 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 geometric properties and the bearing data of Cable Structure, Cable Structure finds the annual position by sunshineduration those surface points the most sufficient, in " R Cable Structure surface point ", has at least a Cable Structure surface point to be annual by a point in sunshineduration the most fully those surface points in Cable Structure.
2. set up the initial mechanical Calculation Basis model A of Cable Structure
_{o}(such as finite element benchmark model) and current initial mechanical Calculation Basis model A
^{t} _{o}the method of (such as finite element benchmark model), sets up and A
_{o}corresponding monitored amount initial value vector C
_{o}method, set up and A
^{t} _{o}corresponding monitored amount current initial value vector C
^{t} _{o}method.A in the method
_{o}and C
_{o}constant.A
^{t} _{o}and C
^{t} _{o}constantly update.Set up A
_{o}and C
_{o}, set up and upgrade A
^{t} _{o}and C
^{t} _{o}method as follows.
If total N root support cable, first determines the coding rule of support cable, support cables all in Cable Structure numbered by this rule, this numbering will be used for generating vector sum matrix in subsequent step." the whole monitored strain data of structure " can by the specified point of K in structure and the strain of L assigned direction of each specified point describe, the change of structural strain data is exactly the change of all strains of K specified point.Each total individual strain measurement value of M (M=K × L) or calculated value carry out characterisation of structures strain information.K and M must not be less than the quantity N of support cable.
For simplicity, in the method by " the monitored strain data of structure " referred to as " monitored amount ".When mentioning " soandso matrix of monitored amount or soandso vector " later, also can be read as " strain soandso matrix or soandso vector ".
Set up initial mechanical Calculation Basis model A
_{o}time, when Cable Structure is completed, or before setting up health monitoring (damaged cable identification) system, obtain " Cable Structure steady temperature data " according to " the temperature survey calculating method of the Cable Structure of this method " survey calculation (to measure by ordinary temperature measuring method, thermal resistance is such as used to measure), " Cable Structure steady temperature data " now use vector T
_{o}represent, be called initial Cable Structure steady temperature data vector T
_{o}.T is obtained in actual measurement
_{o}while, namely at the synchronization in the moment of acquisition Cable Structure steady temperature data, use the direct survey calculation of conventional method to obtain the initial number of all monitored amount of Cable Structure.Conventional method (consult reference materials or survey) is used to obtain temperature variant physical parameter (such as thermal expansivity) and the mechanical property parameters (such as elastic modulus, Poisson ratio) of the various materials that Cable Structure uses; Initial Cable Structure steady temperature data vector T is obtained at Actual measurement
_{o}while, namely at the synchronization in the moment of acquisition Cable Structure steady temperature data, use conventional method Actual measurement to obtain the Actual measurement data of Cable Structure.The Actual measurement data of Cable Structure comprise the measured data such as data, the initial geometric data of Cable Structure, rope force data, drawbar pull data, Cable Structure bearing generalized coordinate data, Cable Structure modal data, structural strain data, structure angle measurement of coordinates data, structure space measurement of coordinates data that the Nondestructive Testing Data of support cable etc. can express the health status of rope.The initial geometric data of Cable Structure can be the spatial data that the spatial data of the end points of all ropes adds a series of point in structure, and object is the geometric properties according to these coordinate data determination Cable Structure.For cablestayed bridge, initial geometric data can be the spatial data that the spatial data of the end points of all ropes adds some points on bridge two ends, socalled bridge type data that Here it is.The data utilizing the Nondestructive Testing Data etc. of support cable can express the health status of rope set up cable system initial damage vector d
_{o}(as the formula (1)), d is used
_{o}represent that Cable Structure is (with initial mechanical Calculation Basis model A
_{o}represent) the initial health of cable system.If there is no the Nondestructive Testing Data of rope and other are when can express the data of the health status of support cable, or when can think that structure original state is not damaged state, vectorial d
_{o}each element numerical value get 0.The temperature variant physical and mechanical properties parameter of the various materials utilizing the measured data of the design drawing of Cable Structure, asconstructed drawing and initial Cable Structure, the Nondestructive Testing Data of support cable, Cable Structure to use and initial Cable Structure steady temperature data vector T
_{o}, utilize mechanics method (such as finite element method) to count " Cable Structure steady temperature data " and set up initial mechanical Calculation Basis model A
_{o}.Corresponding to A
_{o}cable Structure bearing generalized coordinate data form initial Cable Structure bearing generalized coordinate vector U
_{o}.
d
_{o}＝[d
_{o1}d
_{o2}···d
_{oj}···d
_{oN}]
^{T}(1)
D in formula (1)
_{oj}(j=1,2,3 ...., N) represent initial mechanical Calculation Basis model A
_{o}in the initial damage value of jth root rope of cable system, d
_{oj}represent jth root rope not damaged when being 0, represent that this rope thoroughly loses loadbearing capacity when being 100%, represent that the loadbearing capacity of corresponding proportion lost by jth root rope time between 0 and 100%, T represents the transposition (same afterwards) of vector.
T is obtained in actual measurement
_{o}while, namely at the synchronization in the moment of acquisition Cable Structure steady temperature data, the initial value of all monitored amount of the Cable Structure using the direct survey calculation of conventional method to obtain, forms monitored amount initial value vector C
_{o}(see formula (2)).Require at acquisition A
_{o}while obtain C
_{o}, monitored amount initial value vector C
_{o}represent and correspond to A
_{o}the concrete numerical value of " monitored amount ".Because of subject to the foregoing, the Calculation Basis model based on Cable Structure calculates the monitored amount of gained reliably close to the measured data of initial monitored amount, in describing below, will represent this calculated value and measured value with prosign.
C
_{o}＝[C
_{o1}C
_{o2}···C
_{oj}···C
_{oM}]
^{T}(2)
C in formula (2)
_{oj}(j=1,2,3 ...., M) be the original bulk of jth monitored amount in Cable Structure, this component corresponds to a specific jth monitored amount according to coding rule.
No matter which kind of method to obtain initial mechanical Calculation Basis model A by
_{o}, count " Cable Structure steady temperature data " (i.e. initial Cable Structure steady temperature data vector T
_{o}), based on A
_{o}the Cable Structure that calculates calculates data must closely its measured data, and error generally must not be greater than 5%.Like this can utility A
_{o}the Suo Li calculated under the analog case of gained calculates data, strain calculation data, Cable Structure shapometer count certificate and displacement meter counts certificate, Cable Structure angledata, Cable Structure spatial data etc., measured data when reliably truly occurring close to institute's analog case.Model A
_{o}the health status cable system initial damage vector d of middle support cable
_{o}represent, the initial Cable Structure steady temperature data vector T of Cable Structure steady temperature data
_{o}represent.Due to based on A
_{o}the initial value (actual measurement obtains) of the evaluation calculating all monitored amounts closely all monitored amounts, so also can be used in A
_{o}basis on, carry out Mechanics Calculation obtains, A
_{o}the evaluation of each monitored amount form monitored amount initial value vector C
_{o}.T can be said
_{o}, U
_{o}and d
_{o}a
_{o}parameter, C
_{o}by A
_{o}mechanics Calculation result composition.
Set up and upgrade current initial mechanical Calculation Basis model A
^{t} _{o}method be: initial time (namely first time set up A
^{t} _{o}time), A
^{t} _{o}just equal A
_{o}, A
^{t} _{o}corresponding " Cable Structure steady temperature data " are designated as " current initial Cable Structure steady temperature data vector T
^{t} _{o}", at initial 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 Calculation Basis model A of Cable Structure
^{t} _{o}cable Structure bearing generalized coordinate data composition current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, the current initial mechanical Calculation Basis model A of Cable Structure is namely set up for the first time at initial time
^{t} _{o}time, U
^{t} _{o}just equal U
_{o}.A
^{t} _{o}the initial health of support cable and A
_{o}the health status of support cable identical, also use cable system initial damage vector d
_{o}represent, A in cyclic process below
^{t} _{o}the initial health of support cable use cable system initial damage vector d all the time
_{o}represent; Cable Structure is in A
^{t} _{o}during state, this method monitored amount current initial value vector C
^{t} _{o}represent the concrete numerical value of all monitored amounts, C
^{t} _{o}element and C
_{o}element one_to_one corresponding, represent that all monitored amounts are in A in Cable Structure respectively
^{t} _{o}and A
_{o}concrete numerical value during two states.At initial time, C
^{t} _{o}just equal C
_{o}, T
^{t} _{o}, U
^{t} _{o}and d
_{o}a
^{t} _{o}parameter, C
^{t} _{o}by A
^{t} _{o}mechanics Calculation result composition; In Cable Structure military service process, the current data obtaining " 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); Obtaining vector T
^{t}while, actual measurement obtains Cable Structure bearing generalized coordinate current data, all Cable Structure bearing generalized coordinate current data composition current cable structure actual measurement bearing generalized coordinate vector U
^{t}; If T
^{t}equal T
^{t} _{o}and U
^{t}equal U
^{t} _{o}, then do not need A
^{t} _{o}upgrade, otherwise need A
^{t} _{o}, U
^{t} _{o}and T
^{t} _{o}upgrade, update method is: the first step calculates U
^{t}with U
_{o}difference, U
^{t}with U
_{o}difference be exactly the front holder generalized displacement of Cable Structure bearing about initial position, generalized displacement of support is represented with generalized displacement of support vector V, be onetoone relationship between element in generalized displacement of support vector V and generalized displacement of support component, in generalized displacement of support vector V, the numerical value of an element corresponds to the generalized displacement of an assigned direction of an appointment bearing; Second step calculates T
^{t}with T
_{o}difference, T
^{t}with T
_{o}difference be exactly the changes of current cable structure steady temperature data about initial Cable Structure steady temperature data, T
^{t}with T
_{o}difference represent with steady temperature change vector S, S equals T
^{t}deduct T
_{o}, S represents the change of Cable Structure steady temperature data; 3rd step is first to A
_{o}in Cable Structure bearing apply front holder generalized displacement constraint, the numerical value of front holder generalized displacement constraint just takes 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 of applying just takes from steady temperature change vector S, to A
_{o}middle Cable Structure bearing applies generalized displacement of support constraint and to A
_{o}in Cable Structure apply temperature variation after obtain upgrade current initial mechanical Calculation Basis model A
^{t} _{o}, upgrade A
^{t} _{o}while, U
^{t} _{o}all elements numerical value also uses U
^{t}all elements numerical value correspondence replaces, and namely have updated U
^{t} _{o}, T
^{t} _{o}all elements numerical value also uses T
^{t}all elements numerical value correspondence replace, namely have updated T
^{t} _{o}, so just obtain and correctly correspond to A
^{t} _{o}t
^{t} _{o}; Upgrade C
^{t} _{o}method be: when renewal A
^{t} _{o}after, obtain A by Mechanics Calculation
^{t} _{o}in all monitored amounts, current concrete numerical value, these concrete numerical value composition C
^{t} _{o}.
In Cable Structure the currency of all monitored amounts form monitored amount current value vector C(definition see formula (3)).
C＝[C
_{1}C
_{2}···C
_{j}···C
_{M}]
^{T}(3)
C in formula (3)
_{j}(j=1,2,3 ...., M) be the currency of jth monitored amount in Cable Structure, this component C
_{j}according to coding rule and C
_{oj}corresponding to same " monitored amount ".Current cable structure steady temperature data vector T is obtained in actual measurement
^{t}synchronization, actual measurement obtains the current measured value of all monitored amount of Cable Structure, forms monitored amount current value vector C.
3. set up and upgrade the method for Cable Structure unit damage monitored amount transformation matrices Δ C.
Cable Structure unit damage monitored amount transformation matrices Δ C constantly updates, namely at the current initial mechanical Calculation Basis model A of renewal
^{t} _{o}with monitored amount current initial value vector C
^{t} _{o}while, upgrade Cable Structure unit damage monitored amount transformation matrices Δ C.Concrete grammar is as follows:
At the current initial mechanical Calculation Basis model A of Cable Structure
^{t} _{o}basis on carry out several times calculating, calculation times numerically equals the quantity of all support cables.Calculating each time in hypothesis cable system only has a support cable (to use vectorial d at initial damage
_{o}corresponding element represent) basis on increase unit damage D again
_{u}(such as getting 5%, 10%, 20% or 30% equivalent damage is unit damage), occur in calculating each time that the rope damaged is different from during other time calculates the rope occurring damaging, calculate the current calculated value all utilizing mechanics method (such as finite element method) to calculate all monitored amount of Cable Structure each time, the current calculated value of all monitored amount calculated each time forms a monitored amount calculation current vector, and (when hypothesis ith rope has unit damage, available formula (4) represents monitored amount calculation current vector C
^{i} _{t}); Calculate monitored amount calculation current vector each time and deduct monitored amount current initial value vector C
^{t} _{o}, gained vector is exactly that the monitored amount change vector of (to have the position of the support cable of unit damage or numbering etc. for mark) (when ith rope has unit damage, uses δ C under this condition
_{i}represent monitored amount change vector, formula (5) is shown in definition), each element representation of monitored amount change vector is owing to suppose there is the knots modification of the monitored amount corresponding to the unit damage of the Na Gensuo of unit damage and this element of causing when calculating; N root rope is had just to have N number of monitored amount change vector, owing to there being N number of monitored amount, so each monitored amount change vector has N number of element, be made up of the unit damage monitored amount transformation matrices Δ C having M × N number of element successively this N number of monitored amount change vector, the definition of Δ C as the formula (6).
Elements C in formula (4)
^{i} _{tj}(i=1,2,3 ...., N; J=1,2,3 ...., M) represent due to ith rope have a unit damage time, according to the current calculated amount of the monitored amount of the jth corresponding to coding rule.
Δ C in formula (6)
_{j, i}(i=1,2,3 ...., N; J=1,2,3 ...., M) represent only because ith rope has unit damage to cause, according to the change (algebraic value) of the calculating current value of the monitored amount of the jth corresponding to coding rule.Monitored amount change vector δ C
_{i}be actually the row in matrix Δ C, that is formula (6) also can be write as formula (7).
ΔC＝[δC
_{1}δC
_{2}···δC
_{i}···δC
_{N}] (7)
4. monitored amount current value vector C(calculates or actual measurement) with monitored amount current initial value vector C
^{t} _{o}, unit damage monitored amount transformation matrices Δ C, unit damage scalar D
_{u}and the linear approximate relationship between cable system current nominal fatigue vector d, shown in (8) or formula (9).The definition of cable system current nominal fatigue vector d is see formula (10).
d＝[d
_{1}d
_{2}···d
_{i}···d
_{N}]
^{T}(10)
D in formula (10)
_{i}(i=1,2,3 ...., N) be the current nominal fatigue of ith rope (or pull bar) in cable system.
If set rope damage as 100% time represent that rope thoroughly loses loadbearing capacity, so (be such as not more than the damage of 30%) when actual damage is not too large, because Cable Structure material is still in the linear elasticity stage, the distortion of Cable Structure is also less, formula (8) or a kind of like this linear relationship represented by formula (9) less with the error of actual conditions.The error of the linear relationship error vector e expression (8) defined by formula (11) or the shown linear relationship of formula (9).
In formula (11), abs () is the function that takes absolute value, and takes absolute value to each element of the vector of trying to achieve in bracket.
The Part II of this method: the cable system health state evaluation method of knowledge based storehouse (containing parameter) and the monitored amount of actual measurement.
There is certain error in the linear relationship represented by formula (8) or formula (9), therefore simply can not carry out direct solution according to formula (8) or formula (9) and actual measurement monitored amount current value vector C and obtain cable system current nominal fatigue vector d.If this has been doned, the element in the cable system obtained current nominal fatigue vector d even there will be larger negative value, namely negative damage, and this is obviously irrational.Therefore the acceptable solution of cable system current nominal fatigue vector d is obtained (namely with reasonable error, but position and the degree of injury thereof of damaged cable can be determined more accurately from cable system) become a rational solution, available formula (12) expresses this method.
In formula (12), abs () is the function that takes absolute value, and vectorial g describes the legitimate skew departing from ideal linearity relation (formula (8) or formula (9)), is defined by formula (13).
g＝[g
_{1}g
_{2}···g
_{j}···g
_{M}]
^{T}(13)
G in formula (13)
_{j}(j=1,2,3 ...., M) describe the maximum allowable offset departing from formula (8) or the ideal linearity relation shown in formula (9).The error vector e tentative calculation that vector g can define according to formula (11) is selected.
At monitored amount current initial value vector C
^{t} _{o}, unit damage monitored amount transformation matrices Δ C, survey monitored amount current value vector C and unit damage D
_{u}when (setting before calculating Δ C, is scalar) is known, suitable algorithm (such as multiobjective optimization algorithm) can be utilized to solve formula (12), obtain the acceptable solution of cable system current nominal fatigue vector d.
Definition cable system current actual damage vector d
^{a}(see formula (14)), cable system current actual damage vector d
^{a}element can calculate according to formula (15), namely obtain Suo Dangqian actual damage vector d
^{a}, thus can by d
^{a}determine position and the degree of injury of damaged cable, namely achieve the health monitoring of cable system, achieve damaged cable identification.
D in formula (14)
^{a} _{j}(j=1,2,3 ...., N) represent the actual damage value of jth root rope, its definition is shown in formula (15), d
^{a} _{j}represent jth root rope not damaged when being 0, when being 100%, represent that this rope thoroughly loses loadbearing capacity, represent time between 0 and 100% that the loadbearing capacity of corresponding proportion lost by jth root rope, vectorial d
^{a}the coding rule of element and formula (1) in vectorial d
_{o}the coding rule of element identical.
D in formula (15)
_{oj}(i=1,2,3,4, J=1,2,3 ...., N) be vectorial d
_{o}a jth element, d
_{j}it is a jth element of vectorial d.Thus determine position and the degree of injury of damaged cable.
The Part III of this method: the software and hardware part of health monitoring systems.
Hardware components comprises monitoring system (comprising monitored amount monitoring system, temperature monitoring system, Cable Structure bearing generalized coordinate monitoring system), signal picker and computing machine etc.Require that RealTime Monitoring obtains measured data that is temperature required and Cable Structure bearing generalized coordinate, require each monitored amount of RealTime Monitoring simultaneously.
Software should to complete in this method required, can by functions such as computer implemented monitoring, record, control, storage, calculating, notice, warnings.
This method specifically comprises:
A. establish total N root support cable, first determine the coding rule of support cable, support cables all in Cable Structure numbered by this rule, this numbering will be used for generating vector sum matrix in subsequent step; Determine the point being monitored of specifying, namely point being monitored characterizes all specified points of Cable Structure strain information, and gives all specified points numbering; Determine monitored should the changing direction of point being monitored, and give all monitored strain numberings of specifying; " monitored strain numbering " will be used for generating vector sum matrix in subsequent step; " 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 of point being monitored must not be less than the quantity of support cable; The quantity sum of all monitored amounts must not be less than the quantity of support cable; Must not be greater than 30 minutes to the time interval between any twice measurement of same amount RealTime Monitoring in this method, the moment of survey record data is called the physical record data moment;
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 environment residing for Cable Structure composition material and Cable Structure, utilize the geometry measured data of the design drawing of Cable Structure, asconstructed drawing and Cable Structure, utilize these data and parameter to set up the Thermodynamic calculation model of Cable Structure, inquiry Cable Structure location is no less than the meteorological data in recent years of 2 years, the statistics cloudy quantity obtained is during this period of time designated as T cloudy day, in the method daytime can not be seen one of the sun and be called the cloudy day all day, statistics obtains 0 highest temperature after sunrise moment next day between 30 minutes and the lowest temperature at each cloudy day in T cloudy day, the sunrise moment refers to the sunrise moment on the meteorology that base area revolutions and revolution rule are determined, do not represent that the same day necessarily can see the sun, data can be inquired about or calculated sunrise moment of each required day by conventional meteorology, 0 highest temperature after sunrise moment next day between 30 minutes at each cloudy day deducts the maximum temperature difference that the lowest temperature is called the daily temperature at this cloudy day, there is T cloudy day, just there is the maximum temperature difference of the daily temperature at T cloudy day, the maximal value of getting in the maximum temperature difference of the daily temperature at T cloudy day is reference temperature difference per day, Δ T is designated as with reference to temperature difference per day
_{r}, be no less than between inquiry Cable Structure location and Altitude Region, place temperature that the meteorological data in recent years of 2 years or actual measurement obtain environment residing for Cable Structure in time with delta data and the Changing Pattern of sea level elevation, calculate to be no less than 2 years between Cable Structure location and Altitude Region, place Cable Structure in recent years residing for the temperature of environment about the maximum rate of change Δ T of sea level elevation
_{h}, get Δ T for convenience of describing
_{h}unit be DEG C/m, the surface of Cable Structure is got " R Cable Structure surface point ", the Specific Principles getting " R Cable Structure surface point " describes in step b3, the temperature of this R Cable Structure surface point will be obtained below by actual measurement, claiming to survey the temperature data obtained is " R Cable Structure surface temperature measured data ", if utilize the Thermodynamic calculation model of Cable Structure, obtained the temperature of this R Cable Structure surface point by Calculation of Heat Transfer, just claim the temperature data that calculates for " R Cable Structure land surface pyrometer count certificate ", from the minimum height above sea level residing for Cable Structure to most High aititude, in Cable Structure, uniform choosing is no less than three different sea level elevations, at the sea level elevation place that each is chosen, two points are at least chosen 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 chosen 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 in the shade the outer normal direction of the measurement Cable Structure chosen along the sunny slope outer normal direction and Cable Structure that must comprise Cable Structure in the direction of the Temperature Distribution of wall thickness, three points are no less than along each measurement Cable Structure along direction uniform choosing in Cable Structure of the Temperature Distribution of wall thickness, especially, along each, Cable Structure is measured for support cable and only gets a point along the direction of the Temperature Distribution of wall thickness, namely the temperature of the surface point of support cable is only measured, measure all temperature be selected a little, the temperature recorded 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 " to 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 have chosen the individual different sea level elevation of H, at each sea level elevation place, have chosen B and measure the direction of Cable Structure along the Temperature Distribution of wall thickness, in Cable Structure, E point is have chosen along each measurement Cable Structure along the direction of the Temperature Distribution of wall thickness, wherein H and E is not less than 3, B is not less than 2, especially, 1 is equaled for support cable E, what meter Cable Structure " measured the point of Cable Structure along the temperature profile data of thickness " adds up to HBE, the temperature of this HBE " measuring the point of Cable Structure along the temperature profile data of thickness " will be obtained below by actual measurement, claiming to survey the temperature data obtained is " HBE Cable Structure is along thickness temperature measured data ", if utilize the Thermodynamic calculation 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, the temperature data calculated just is claimed to be " HBE Cable Structure calculates data along thickness temperature ", the number temperature profile data at sea level elevation place " identical sea level elevation Cable Structure is along the temperature profile data of thickness " will chosen at each in this method ", measure temperature in Cable Structure location according to meteorology to require to choose a position, obtain meeting the temperature that meteorology measures the Cable Structure place environment of temperature requirement by the actual measurement of this position, 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 this day getable, at the flat board of this position of sound production one piece of carbon steel material, 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 with 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 this day getable, the nonsunny slope of reference plate is covered with insulation material, RealTime Monitoring is obtained 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 meeting the temperature record that meteorology measures the Cable Structure place environment of temperature requirement simultaneously, the temperature measured data sequence of the Cable Structure place environment after sunrise moment next day between 30 minutes is obtained being carved at sunrise the same 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 of the Cable Structure place environment after being carved into the sunrise moment next day same day at sunrise between 30 minutes, find the maximum temperature in the temperature measured data sequence of Cable Structure place environment and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains Cable Structure place environment after sunrise moment next day between 30 minutes is deducted 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}, calculated the rate of change of temperature about the time of Cable Structure place environment by Conventional mathematical by the temperature measured data sequence of Cable Structure place environment, this rate of change is also along with time variations, the measured data sequence of the temperature of the sunny slope of the reference plate after sunrise moment next day between 30 minutes is obtained being carved at sunrise the same 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 of the temperature of the sunny slope of the reference plate after being carved into the sunrise moment next day same day at sunrise between 30 minutes, find the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains the temperature of the sunny slope of reference plate after sunrise moment next day between 30 minutes is deducted 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}, the Cable Structure surface temperature measured data sequence of all R Cable Structure surface points after sunrise moment next day between 30 minutes is obtained being carved at sunrise the same day by RealTime Monitoring, R Cable Structure surface point is had 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 the Cable Structure surface temperature measured data after being carved into the sunrise moment next day same day of a Cable Structure surface point at sunrise between 30 minutes, find the maximum temperature in each Cable Structure surface temperature measured data sequence and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains the temperature of each Cable Structure surface point after sunrise moment next day between 30 minutes is deducted 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}, calculated the rate of change of temperature about the time of each Cable Structure surface point by Conventional mathematical by each Cable Structure surface temperature measured data sequence, the temperature of each Cable Structure surface point about the rate of change of time also along with time variations, 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 difference amounting to maximum temperature in BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " and minimum temperature at the sea level elevation place that each is chosen, the absolute value of this difference is called " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", have chosen H different sea level elevation just to have H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", the maximal value in this H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference " is claimed to be " Cable Structure thickness direction maximum temperature difference ", be designated as Δ T
_{tmax},
B3: survey calculation obtains Cable Structure steady temperature data, first, determine the moment obtaining Cable Structure steady temperature data, the condition relevant to the moment determining to obtain Cable Structure steady temperature data has six, Section 1 condition is moment of obtaining Cable Structure steady temperature data between after being carved into sunrise moment next day at sunset between 30 minutes on same day, the sunset moment refers to the sunset moment on base area revolutions and the meteorology determined of revolution rule, can inquire about data or be calculated sunset moment of each required day by conventional meteorology, the a condition of Section 2 condition be after being carved into sunrise moment next day at sunrise between 30 minutes on same day 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 into sunrise moment next day at sunrise between 30 minutes on same day during this period of time in, the environment maximum error Δ T that survey calculation obtains 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}Δ T is not more than after deducting 2 degrees Celsius
_{emax}, and Cable Structure surface maximum temperature difference Δ T
_{smax}be not more than Δ T
_{pmax}, one of only need meet in a condition of Section 2 and b condition is just called and meets Section 2 condition, Section 3 condition is when obtaining Cable Structure steady temperature data, and 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, Section 4 condition is when obtaining Cable Structure steady temperature data, and 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, Section 5 condition is when obtaining 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 be carved into the minimal value after sunrise moment next day between 30 minutes the same day at sunrise, Section 6 condition is when obtaining Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T
_{tmax}be not more than 1 degree Celsius, this method utilizes abovementioned six conditions, any one in following three kinds of moment is called " the mathematics moment obtaining Cable Structure steady temperature data ", the first moment meets the moment of the Section 1 in abovementioned " condition relevant to the moment determining to obtain Cable Structure steady temperature data " to Section 5 condition, the second moment is moment of the Section 6 condition only met in abovementioned " condition relevant to determining to obtain moment of Cable Structure steady temperature data ", simultaneously the third moment meets the moment of the Section 1 in abovementioned " condition relevant to the moment determining to obtain Cable Structure steady temperature data " to Section 6 condition, when the mathematics moment obtaining Cable Structure steady temperature data is exactly one in this method in the physical record data moment, the moment obtaining Cable Structure steady temperature data is exactly the mathematics moment obtaining Cable Structure steady temperature data, if the mathematics moment obtaining Cable Structure steady temperature data is not any one moment in this method in the physical record data moment, then getting this method closest to moment of those physical record data in the mathematics moment obtaining Cable Structure steady temperature data is the moment obtaining Cable Structure steady temperature data, the amount being used in the moment survey record obtaining Cable Structure steady temperature data is carried out Cable Structure relevant health monitoring analysis by this method, this method is similar to thinks that the Cable Structure temperature field in the moment obtaining Cable Structure steady temperature data is in stable state, and namely the Cable Structure temperature in this moment does not change in time, 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 obtaining Cable Structure steady temperature data, utilize the Thermodynamic calculation model of Cable Structure, the Temperature Distribution of the Cable Structure in the moment obtaining Cable Structure steady temperature data is calculated by conventional heat transfer, now the temperature field of Cable Structure calculates by stable state, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculated comprises the accounting temperature of R Cable Structure surface point in Cable Structure, the accounting temperature of R Cable Structure surface point is called that R Cable Structure steadystate surface temperature calculates 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 calculates data along thickness temperature ", when R Cable Structure surface temperature measured data and R Cable Structure steadystate surface temperature calculate data correspondent equal, and when " HBE Cable Structure is along thickness temperature measured data " and " HBE Cable Structure calculates data along thickness temperature " correspondent equal, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculated is called " Cable Structure steady temperature data " in the method, " R Cable Structure surface temperature measured data " is now called " R Cable Structure steadystate 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 ", when the surface of Cable Structure is got " R Cable Structure surface point ", the quantity of " R Cable Structure surface point " must meet three conditions with distribution, first condition is when Cable Structure temperature field is in stable state, when the temperature of Cable Structure any point be on the surface by " R Cable Structure surface point " in obtain with the observed temperature linear interpolation of the Cable Structure point that this arbitrfary point is adjacent on the surface time, the error of the Cable Structure that linear interpolation the obtains temperature of this arbitrfary point and the Cable Structure actual temperature of this arbitrfary point on the surface is on the surface not more than 5%, Cable Structure surface comprises support cable surface, second condition is not less than 4 in the quantity of the point of same sea level elevation in " R Cable Structure surface point ", 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 DEG C 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 obtained, gets Δ T for convenience of describing
_{h}unit be DEG C/m, be m for convenience of describing the unit getting Δ h, " R Cable Structure surface point " along the definition of the adjacent between two Cable Structure surface point of sea level elevation refer to only consider sea level elevation time, in " R Cable Structure surface point ", there is not 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, 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 geometric properties and the bearing data of Cable Structure, Cable Structure finds the annual position by sunshineduration those surface points the most sufficient, in " R Cable Structure surface point ", has at least a Cable Structure surface point to be annual by a point in sunshineduration the most fully those surface points in Cable Structure,
C. the Cable Structure steady temperature data under original state are obtained according to " the temperature survey calculating method of the Cable Structure of this method " direct survey calculation, 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}"; Survey or consult reference materials and obtain the temperature variant physical and mechanical properties parameter of the various materials that Cable Structure uses; T is obtained in actual measurement
_{o}while, namely at the initial Cable Structure steady temperature data vector T of acquisition
_{o}the synchronization in moment, direct survey calculation obtains the measured data of initial Cable Structure, and the measured data of initial Cable Structure comprises the Nondestructive Testing Data of the health status expressing support cable, the initial value of all monitored amounts, the Initial cable force data of all support cables, initial Cable Structure modal data, initial Cable Structure strain data, initial Cable Structure geometric data, Cable Structure bearing generalized coordinate data, initial Cable Structure spatial data; The initial value of all monitored amounts forms monitored amount initial value vector C
_{o}; The Nondestructive Testing Data that utilization can express the health status of support cable sets up cable system initial damage vector d
_{o}, cable system initial damage vector d
_{o}element number equal N, d
_{o}element and support cable be onetoone relationship, cable system initial damage vector d
_{o}element numerical value represent the degree of injury of corresponding support cable, if cable system initial damage vector d
_{o}the numerical value of a certain element be 0, represent that the support cable corresponding to this element is intact, do not damage, if its numerical value is 100%, then represent that the support cable corresponding to this element completely loses loadbearing capacity, if its numerical value is between 0 and 100%, then represent that this support cable loses the loadbearing capacity of corresponding proportion, if there is no the Nondestructive Testing Data of support cable and other are when can express the data of the health status of support cable, or when thinking that Cable Structure original state is not damaged state, vectorial d
_{o}each element numerical value get 0; Corresponding to A
_{o}cable Structure bearing generalized coordinate data form initial Cable Structure bearing generalized coordinate vector U
_{o}; Bearing generalized coordinate comprises line amount and angular amount two kinds;
Temperature variant physical and mechanical properties parameter, the initial Cable Structure bearing generalized coordinate vector U of the various materials d. used according to the measured data of the design drawing of Cable Structure, asconstructed drawing and initial Cable Structure, the Nondestructive Testing Data of support cable, Cable Structure
_{o}, initial Cable Structure steady temperature data vector T
_{o}with all Cable Structure data obtained with preceding step, set up the initial mechanical Calculation Basis model A counting the Cable Structure of " Cable Structure steady temperature data "
_{o}, based on A
_{o}the Cable Structure that calculates calculates data must closely its measured data, 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}support cable health status with cable system initial damage vector d
_{o}represent; Corresponding to A
_{o}the initial value monitored amount initial value vector C of all monitored amount
_{o}represent; First time sets up the current initial mechanical Calculation Basis model A counting the Cable Structure of " Cable Structure steady temperature data "
^{t} _{o}, monitored amount current initial value vector C
^{t} _{o}" current initial Cable Structure steady temperature data vector T
^{t} _{o}"; Set up the current initial mechanical Calculation Basis model A of Cable Structure for the first time
^{t} _{o}with monitored amount current initial value vector C
^{t} _{o}time, the current initial mechanical Calculation Basis model A of Cable Structure
^{t} _{o}just equal the initial mechanical Calculation Basis model A of Cable Structure
_{o}, monitored amount current initial value vector 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 the current initial mechanical Calculation Basis model A of Cable Structure for the first time
^{t} _{o}time, T
^{t} _{o}just equal T
_{o}; Corresponding to the current initial mechanical Calculation Basis model A of Cable Structure
^{t} _{o}cable Structure bearing generalized coordinate data composition current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, set up the current initial mechanical Calculation Basis model A of Cable Structure for the first time
^{t} _{o}time, U
^{t} _{o}just equal U
_{o}; A
^{t} _{o}the initial health of support cable and A
_{o}the health status of support cable identical, also use cable system initial damage vector d
_{o}represent, A in cyclic process below
^{t} _{o}the initial health of support cable use cable system initial damage vector d all the time
_{o}represent; T
_{o}, U
_{o}and d
_{o}a
_{o}parameter, by A
_{o}the initial value of all monitored amount that obtains of Mechanics Calculation result and C
_{o}the initial value of all monitored amount represented is identical, therefore alternatively 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; A in the method
_{o}, U
_{o}, C
_{o}, d
_{o}and T
_{o}constant;
E. from entering the circulation being walked to m step by e here; In Cable Structure military service process, the current data of " Cable Structure steady temperature data " is constantly obtained according to " the temperature survey calculating method of the Cable Structure of this method " continuous Actual measurement, 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; Current cable structure steady temperature data vector T is obtained 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 structure actual measurement bearing generalized coordinate vector U
^{t};
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 Calculation Basis model A according to step f1 to f3
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, monitored amount current initial value vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o};
F1. U is compared respectively
^{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}, then 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. U is calculated
^{t}with U
_{o}difference, U
^{t}with U
_{o}difference be exactly the front holder generalized displacement of Cable Structure bearing about initial position, with generalized displacement of support vector V represent generalized displacement of support, V equals U
^{t}deduct U
_{o}, be onetoone relationship between the element in generalized displacement of support vector V and generalized displacement of support component, in generalized displacement of support vector V, the numerical value of an element corresponds to the generalized displacement of an assigned direction of an appointment bearing; Calculate T
^{t}with T
_{o}difference, T
^{t}with T
_{o}difference be exactly the changes of current cable structure steady temperature data about initial Cable Structure steady temperature data, T
^{t}with T
_{o}difference represent with steady temperature change vector S, S equals T
^{t}deduct T
_{o}, S represents the change of Cable Structure steady temperature data;
F3. first to A
_{o}in Cable Structure bearing apply front holder generalized displacement constraint, the numerical value of front holder generalized displacement constraint just takes 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 of applying just takes from steady temperature change vector S, to A
_{o}middle Cable Structure bearing applies generalized displacement of support constraint and to A
_{o}in Cable Structure apply temperature variation after obtain upgrade current initial mechanical Calculation Basis model A
^{t} _{o}, upgrade A
^{t} _{o}while, U
^{t} _{o}all elements numerical value also uses U
^{t}all elements numerical value correspondence replaces, and namely have updated U
^{t} _{o}, T
^{t} _{o}all elements numerical value also uses T
^{t}all elements numerical value correspondence replace, namely have updated T
^{t} _{o}, so just obtain and correctly correspond to A
^{t} _{o}t
^{t} _{o}and U
^{t} _{o}; Upgrade C
^{t} _{o}method be: when renewal A
^{t} _{o}after, obtain A by Mechanics Calculation
^{t} _{o}in all monitored amounts, current concrete numerical value, these concrete numerical value composition C
^{t} _{o}; A
^{t} _{o}the initial health of support cable use cable system initial damage vector d all the time
_{o}represent;
G. at current initial mechanical Calculation Basis 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 amount transformation matrices Δ C and unit damage scalar D by calculating
_{u};
G1. Cable Structure unit damage monitored amount transformation matrices Δ C constantly updates, namely at the current initial mechanical Calculation Basis model A of renewal
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, monitored amount current initial value vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o}afterwards, Cable Structure unit damage monitored amount transformation matrices Δ C and unit damage scalar D must then be upgraded
_{u};
G2. at the current initial mechanical Calculation Basis model A of Cable Structure
^{t} _{o}basis on carry out several times Mechanics Calculation, calculation times numerically equals the quantity of all ropes, has N root support cable just to have N calculating, each time calculate hypothesis cable system in only have a support cable to have unit damage scalar D
_{u}occur in calculating each time that the rope damaged is different from during other time calculates the rope occurring damaging, calculate the current calculated value of all monitored amounts in Cable Structure each time, the current calculated value of all monitored amount calculated each time forms a monitored amount calculation current vector, element number rule and the monitored amount initial value vector C of monitored amount calculation current vector
_{o}element number rule identical;
G3. the monitored amount calculation current vector calculated each time deducts monitored amount current initial value vector C
^{t} _{o}obtain a monitored amount change vector; N root support cable is had just to have N number of monitored amount change vector;
G4. the Cable Structure unit damage monitored amount transformation matrices Δ C having N to arrange is made up of successively this N number of monitored amount change vector; Each row of Cable Structure unit damage monitored amount transformation matrices Δ C correspond to a monitored amount change vector;
H. current cable structure steady temperature data vector T is obtained in actual measurement
^{t}while, actual measurement obtains at acquisition current cable structure steady temperature data vector T
^{t}the current measured value of all monitored amount of Cable Structure of synchronization in moment, form monitored amount current value vector C; Monitored amount current value vector C and monitored amount current initial value vector 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 not concrete numerical value in the same time;
I. cable system current nominal fatigue vector d is defined, the element number of cable system current nominal fatigue vector d equals the quantity of support cable, be onetoone relationship between the element of cable system current nominal fatigue vector d and support cable, the element numerical value of cable system current nominal fatigue vector d represents the nominal fatigue degree of corresponding support cable or nominal health status; The coding rule of the element of vector d and vectorial d
_{o}the coding rule of element identical;
J. according to monitored amount current value vector C with monitored amount current initial value vector C
^{t} _{o}, Cable Structure unit damage monitored amount transformation matrices Δ C, unit damage scalar D
_{u}and the linear approximate relationship existed between cable system to be asked current nominal fatigue vector d, this linear approximate relationship can be expressed as formula 1, and other amount in formula 1 except d is known, solves formula 1 and just can calculate cable system current nominal fatigue vector d;
K. cable system current actual damage vector d is defined
^{a}, cable system current actual damage vector d
^{a}element number equal the quantity of support cable, cable system current actual damage vector d
^{a}element and support cable between be onetoone relationship, cable system current actual damage vector d
^{a}element numerical value represent the actual damage degree of corresponding support cable or actual health status; Vector d
^{a}the coding rule of element and vectorial d
^{o}the coding rule of element identical;
L. the cable system utilizing formula 2 to express current actual damage vector d
^{a}a jth element d
^{a} _{j}with cable system initial damage vector d
_{o}a jth element d
_{oj}with a jth element d of cable system current nominal fatigue vector d
_{j}between relation, calculate cable system current actual damage vector d
^{a}all elements;
J=1 in formula 2,2,3 ...., N, d
^{a} _{j}represent jth root support cable not damaged when being 0, when being 100%, represent that this rope thoroughly loses loadbearing capacity, time between 0 and 100%, represent that jth root support cable loses the loadbearing capacity of corresponding proportion; Cable system current actual damage vector d
^{a}element numerical value represent the degree of injury of corresponding support cable, so according to cable system current actual damage vector d
^{a}impaired and the degree of injury of which rope can be defined, namely achieve damaged cable identification or the health monitoring of cable system in Cable Structure;
M. get back to e step, start the circulation next time being walked to m step by e.
Beneficial effect: when the temperature field of Cable Structure is subject to affecting of the factor such as sunshine and environment temperature, the temperature field of Cable Structure is constantly change, the change of temperature field of Cable Structure must affect the monitored amount of Cable Structure, only have and monitored amount is rejected could carry out rational monitoring structural health conditions based on monitored amount by temperature profile effect part, and the temperature field measurement of Cable Structure and calculating are very complicated, this method discloses to comprise and is a kind ofly suitable for the simple of monitoring structural health conditions, economical, feasible, the cable structure health monitoring method of efficient structure temperature field computing method, adopt this method when generalized displacement appears in Cable Structure bearing, many ropes of Cable Structure synchronous impaired time, and the temperature of Cable Structure along with time variations time, very monitor assessment can identify the health status (comprising position and the degree of injury thereof of all damaged cables) of cable system, the effective health monitoring of system and method disclosed in this method to cable system is highly profitable.
Embodiment
When having generalized displacement of support and temperature variation, for the health monitoring of the cable system of Cable Structure, this method discloses a kind of system and method can monitoring the health status identifying each root rope in cable system in Cable Structure rationally and effectively.The following describes of embodiment of this method is in fact only exemplary, and object is never the application or the use that limit this method.
This method adopts a kind of algorithm, and this algorithm is for monitoring the health status of the cable system in Cable Structure.During concrete enforcement, the following step is the one in the various steps that can take.
The first step: determine " the temperature survey calculating method of the Cable Structure of this method ", the method concrete steps are as follows:
A walks: inquiry or actual measurement (can be measured by ordinary temperature measuring method, thermal resistance is such as used to measure) obtain the temperature variant thermal conduction study parameter of environment residing for Cable Structure composition material and Cable Structure, utilize the geometry measured data of the design drawing of Cable Structure, asconstructed drawing and Cable Structure, utilize these data and parameter to set up the Thermodynamic calculation model (such as finite element model) of Cable Structure.Inquiry Cable Structure location is no less than the meteorological data in recent years of 2 years, the statistics cloudy quantity obtained is during this period of time designated as T cloudy day, statistics obtains 0 highest temperature after sunrise moment next day between 30 minutes and the lowest temperature at each cloudy day in T cloudy day, the sunrise moment refers to the sunrise moment on the meteorology that base area revolutions and revolution rule are determined, data can be inquired about or calculated sunrise moment of each required day by conventional meteorology, 0 highest temperature after sunrise moment next day between 30 minutes at each cloudy day deducts the maximum temperature difference that the lowest temperature is called the daily temperature at this cloudy day, there is T cloudy day, just there is the maximum temperature difference of the daily temperature at T cloudy day, the maximal value of getting in the maximum temperature difference of the daily temperature at T cloudy day is reference temperature difference per day, Δ T is designated as with reference to temperature difference per day
_{r}, be no less than between inquiry Cable Structure location and Altitude Region, place temperature that the meteorological data in recent years of 2 years or actual measurement obtain environment residing for Cable Structure in time with delta data and the Changing Pattern of sea level elevation, calculate to be no less than 2 years between Cable Structure location and Altitude Region, place Cable Structure in recent years residing for the temperature of environment about the maximum rate of change Δ T of sea level elevation
_{h}, get Δ T for convenience of describing
_{h}unit be DEG C/m, the surface of Cable Structure is got " R Cable Structure surface point ", the Specific Principles getting " R Cable Structure surface point " describes in step b3, the temperature of this R Cable Structure surface point will be obtained below by actual observation record, claiming to survey the temperature data obtained is " R Cable Structure surface temperature measured data ", if utilize the Thermodynamic calculation model of Cable Structure, obtained the temperature of this R Cable Structure surface point by Calculation of Heat Transfer, just claim the temperature data that calculates for " R Cable Structure land surface pyrometer count certificate ".From the minimum height above sea level residing for Cable Structure to most High aititude, in Cable Structure, uniform choosing is no less than three different sea level elevations, if the sea level elevation of such as Cable Structure is between 0m to 200m, so can choose height above sea level 0m, 50m, 100m and height above sea level 200m, crossing with Cable Structure surface with imaginary surface level at the sea level elevation place that each is chosen, obtain intersection, surface level is crossing with Cable Structure obtains cross surface, intersection is the outer edge line of cross surface, 6 points are chosen 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 chosen 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 6 directions of the measurement Cable Structure chosen along the Temperature Distribution of wall thickness, first according to the meteorological data throughout the year in region, Cable Structure position and the physical dimension of Cable Structure, volume coordinate, Cable Structure surrounding environment etc. determines the sunny slope of Cable Structure and in the shade, the sunny slope of Cable Structure and in the shade face are the parts on the surface of Cable Structure, at the sea level elevation place that each is chosen, aforementioned intersection respectively has one section in sunny slope and in the shade, these two sections of intersection respectively have a mid point, cross the outer normal that these two mid points get Cable Structure, these two outer normals are called the sunny slope outer normal of Cable Structure and in the shade outer normal of Cable Structure by this method, these two outer normal directions are called the sunny slope outer normal direction of Cable Structure and in the shade outer normal direction of Cable Structure by this method, the outer normal of obvious sunny slope and the outer normal of in the shade all crossing with aforementioned intersection, also two intersection points are just had, intersection is divided into two line segments by these two intersection points, 2 points are got respectively on two line segments, totally 4 points, each line segment in two of intersection line segments is divided into equal 3 sections of length by taken point, the outer normal on Cable Structure surface is got at these 4 some places, the outer normal on 6 Cable Structure surfaces is just have chosen so altogether at each selected sea level elevation place, the direction of 6 outer normals is exactly " measuring the direction of Cable Structure along the Temperature Distribution of wall thickness ".There are two intersection points on the surface of each " measures the direction of Cable Structure along the Temperature Distribution of wall thickness " line and Cable Structure, if Cable Structure is hollow, these, two intersection points are on Cable Structure outside surface, another on an internal surface, if Cable Structure is solid, these two intersection points are all on Cable Structure outside surface, connect these two intersection points and obtain a straightline segment, straightline segment is chosen three points again, this straightline segment is divided into four sections by these three points, measure two end points of Cable Structure at these three points chosen and straightline segment, amount to the temperature of 5 points, concrete can first hole in Cable Structure, temperature sensor is embedded in this 5 some places, especially, can not hole in support cable, support cable is only measured to the temperature of support cable surface point, in any case, the temperature recorded all is called this place " Cable Structure is along the temperature profile data of thickness ", wherein along crossing with same " intersection on surface level and Cable Structure surface ", " measure the direction of Cable Structure along the Temperature Distribution of wall thickness " to 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 have chosen the individual different sea level elevation of H, at each sea level elevation place, have chosen B and measure the direction of Cable Structure along the Temperature Distribution of wall thickness, in Cable Structure, E point is have chosen along each measurement Cable Structure along the direction of the Temperature Distribution of wall thickness, wherein H and E is not less than 3, B is not less than 2, especially, 1 is equaled for support cable E, what meter Cable Structure " measured the point of Cable Structure along the temperature profile data of thickness " adds up to HBE, the temperature of this HBE " measuring the point of Cable Structure along the temperature profile data of thickness " will be obtained below by actual measurement, claiming to survey the temperature data obtained is " HBE Cable Structure is along thickness temperature measured data ", if utilize the Thermodynamic calculation 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, the temperature data calculated just is claimed to be " HBE Cable Structure calculates data along thickness temperature ", the number temperature profile data at sea level elevation place " identical sea level elevation Cable Structure is along the temperature profile data of thickness " will chosen at each in this method ".Measuring temperature in Cable Structure location according to meteorology to require to choose a position, meeting obtaining in this position actual observation record the temperature that meteorology measures the Cable Structure place environment of temperature requirement, 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 this day getable (as long as there was sunrise the same day, this position just should by sunlight), at the flat board (square plate that the wide 3mm of such as 30cm is thick) of this position of sound production one piece of carbon steel material (such as No. 45 carbon steels), be called reference plate, reference plate can not contact with ground, reference plate overhead distance is not less than 1.5 meters, reference plate can be placed in and meet the top that meteorology temperature measures the wooden thermometer screen required, the one side of this reference plate on the sunny side, be called that sunny slope (such as, time on the Northern Hemisphere, sunny slope faces up towards south, full daytime is all by sunshine, sunny slope should have the suitable gradient to make snow can not accumulate or clear up sunny slope after snow), the sunny slope of reference plate is coarse with dark color (being conducive to accepting solar irradiation), 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 this day getable, the nonsunny slope of reference plate is covered with insulation material (the thick calcium carbonate insulation material of such as 5mm), RealTime Monitoring record is obtained the temperature of the sunny slope of reference plate.
B walks, RealTime Monitoring (can be measured by ordinary temperature measuring method, thermal resistance is such as used to measure, such as every 10 minutes survey records temperature data) record R the Cable Structure surface temperature measured data obtaining abovementioned R Cable Structure surface point, RealTime Monitoring (can be measured by ordinary temperature measuring method simultaneously, thermal resistance is such as used to measure, such as every 10 minutes survey records temperature data) obtain the temperature profile data of previously defined Cable Structure along thickness, RealTime Monitoring (can be measured by ordinary temperature measuring method simultaneously, such as in the wooden thermometer screen meeting meteorology temperature measurement requirement, lay thermal resistance and measure temperature, such as every 10 minutes survey records temperature data) record the temperature record obtaining the Cable Structure place environment meeting the requirement of meteorology measurement temperature, (can be measured by ordinary temperature measuring method by RealTime Monitoring, such as in the wooden thermometer screen meeting meteorology temperature measurement requirement, lay thermal resistance and measure temperature, such as every 10 minutes survey records temperature data) record obtains being carved at sunrise the temperature measured data sequence of the Cable Structure place environment after sunrise moment next day between 30 minutes the same day, the temperature measured data sequence of Cable Structure place environment is arranged according to time order and function order by the temperature measured data of the Cable Structure place environment after being carved into the sunrise moment next day same day at sunrise between 30 minutes, find the maximum temperature in the temperature measured data sequence of Cable Structure place environment and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains Cable Structure place environment after sunrise moment next day between 30 minutes is deducted by the maximum temperature in the temperature measured data sequence of Cable Structure place environment, be designated as Δ T
_{emax}, (such as first the temperature measured data sequence of Cable Structure place environment is carried out curve fitting by Conventional mathematical calculating by the temperature measured data sequence of Cable Structure place environment, then by asking curve to the derivative of time or by asking on curve each point corresponding to survey record data time by numerical method to the rate of change of time) obtain the rate of change of temperature about the time of Cable Structure place environment, this rate of change is also along with time variations, (can be measured by ordinary temperature measuring method by RealTime Monitoring, such as use the temperature of the dull and stereotyped sunny slope of thermal resistance witness mark, such as every 10 minutes survey records temperature data) obtain being carved at sunrise the same day measured data sequence of the temperature of the sunny slope of the reference plate after sunrise moment next day between 30 minutes, 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 of the temperature of the sunny slope of the reference plate after being carved into the sunrise moment next day same day at sunrise between 30 minutes, find the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains the temperature of the sunny slope of reference plate after sunrise moment next day between 30 minutes is deducted by the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate, be designated as Δ T
_{pmax}, (can be measured by ordinary temperature measuring method by RealTime Monitoring, thermal resistance is such as used to measure Cable Structure surface point, such as every 10 minutes survey records temperature data) record obtains being carved at sunrise the Cable Structure surface temperature measured data sequence of all R Cable Structure surface points after sunrise moment next day between 30 minutes the same day, R Cable Structure surface point is had 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 the Cable Structure surface temperature measured data after being carved into the sunrise moment next day same day of a Cable Structure surface point at sunrise between 30 minutes, find the maximum temperature in each Cable Structure surface temperature measured data sequence and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains the temperature of each Cable Structure surface point after sunrise moment next day between 30 minutes is deducted 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 designated as Δ T
_{smax}, (such as first each Cable Structure surface temperature measured data sequence is carried out curve fitting by Conventional mathematical calculating by each Cable Structure surface temperature measured data sequence, then by asking curve to the derivative of time or by asking on curve each point corresponding to survey record data time by numerical method to the rate of change of time) obtain the rate of change of temperature about the time of each Cable Structure surface point, the temperature of each Cable Structure surface point about the rate of change of time also along with time variations.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 difference amounting to maximum temperature in BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " and minimum temperature at the sea level elevation place that each is chosen, the absolute value of this difference is called " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", have chosen H different sea level elevation just to have H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", the maximal value in this H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference " is claimed to be " Cable Structure thickness direction maximum temperature difference ", be designated as Δ T
_{tmax}.
C walks, and survey calculation obtains Cable Structure steady temperature data; First, determine the moment obtaining Cable Structure steady temperature data, the condition relevant to the moment determining to obtain Cable Structure steady temperature data has six, Section 1 condition is moment of obtaining Cable Structure steady temperature data between after being carved into sunrise moment next day at sunset between 30 minutes on same day, the sunset moment refers to the sunset moment on base area revolutions and the meteorology determined of revolution rule, can inquire about data or be calculated sunset moment of each required day by conventional meteorology; The a condition of Section 2 condition be after being carved into sunrise moment next day at sunrise between 30 minutes on same day during this period of time in, Δ T
_{pmax}with Δ T
_{smax}all be not more than 5 degrees Celsius; The b condition that Section 2 must meet be after being carved into sunrise moment next day at sunrise between 30 minutes on same day during this period of time in, the Δ T that survey calculation obtains above
_{emax}be not more than with reference to temperature difference per day Δ T
_{r}, and the Δ T that survey calculation obtains above
_{pmax}deduct 2 degrees Celsius and be not more than Δ T
_{emax}, and the Δ T that survey calculation obtains above
_{smax}be not more than Δ T
_{pmax}; One of only need meet in a condition of Section 2 and b condition is just called and meets Section 2 condition; Section 3 condition is when obtaining Cable Structure steady temperature data, and 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; Section 4 condition is when obtaining Cable Structure steady temperature data, and 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; Section 5 condition is when obtaining 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 be carved into the minimal value after sunrise moment next day between 30 minutes the same day at sunrise; Section 6 condition is when obtaining Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T
_{tmax}be not more than 1 degree Celsius.This method utilizes abovementioned six conditions, any one in following three kinds of moment is called " the mathematics moment obtaining Cable Structure steady temperature data ", the first moment meets the moment of the Section 1 in abovementioned " condition relevant to the moment determining to obtain Cable Structure steady temperature data " to Section 5 condition, the second moment is moment of the Section 6 condition only met in abovementioned " condition relevant to determining to obtain moment of Cable Structure steady temperature data ", simultaneously the third moment meets the moment of the Section 1 in abovementioned " condition relevant to the moment determining to obtain Cable Structure steady temperature data " to Section 6 condition, when the mathematics moment obtaining Cable Structure steady temperature data is exactly one in this method in the physical record data moment, the moment obtaining Cable Structure steady temperature data is exactly the mathematics moment obtaining Cable Structure steady temperature data, if the mathematics moment obtaining Cable Structure steady temperature data is not any one moment in this method in the physical record data moment, then getting this method closest to moment of those physical record data in the mathematics moment obtaining Cable Structure steady temperature data is the moment obtaining Cable Structure steady temperature data, the amount being used in the moment survey record obtaining Cable Structure steady temperature data is carried out Cable Structure relevant health monitoring analysis by this method, this method is similar to thinks that the Cable Structure temperature field in the moment obtaining Cable Structure steady temperature data is in stable state, and namely the Cable Structure temperature in this moment does not change in time, and this moment is exactly moment of the acquisition Cable Structure steady temperature data of this method, then, according to Cable Structure heat transfer characteristic, utilize R Cable Structure surface temperature measured data and " HBE Cable Structure is along the thickness temperature measured data " in the moment obtaining Cable Structure steady temperature data, utilize the Thermodynamic calculation model (such as finite element model) of Cable Structure, the Temperature Distribution that (such as finite element method) obtains the Cable Structure in the moment obtaining Cable Structure steady temperature data is calculated by conventional heat transfer, now the temperature field of Cable Structure calculates by stable state, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculated comprises the accounting temperature of R Cable Structure surface point in Cable Structure, the accounting temperature of R Cable Structure surface point is called that R Cable Structure steadystate surface temperature calculates 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 calculates data along thickness temperature ", when R Cable Structure surface temperature measured data and R Cable Structure steadystate surface temperature calculate data correspondent equal, and when " HBE Cable Structure is along thickness temperature measured data " and " HBE Cable Structure calculates data along thickness temperature " correspondent equal, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculated is called " Cable Structure steady temperature data " in the method, " R Cable Structure surface temperature measured data " is now called " R Cable Structure steadystate 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 ".When the surface of Cable Structure is got " R Cable Structure surface point ", the quantity of " R Cable Structure surface point " must meet three conditions with distribution, first condition is when Cable Structure temperature field is in stable state, when the temperature of Cable Structure any point be on the surface by " R Cable Structure surface point " in obtain with the observed temperature linear interpolation of the Cable Structure point that this arbitrfary point is adjacent on the surface time, the error of the Cable Structure that linear interpolation the obtains temperature of this arbitrfary point and the Cable Structure actual temperature of this arbitrfary point on the surface is on the surface not more than 5%; Cable Structure surface comprises support cable surface; Second condition is not less than 4 in the quantity of the point of same sea level elevation in " R Cable Structure surface point ", 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 DEG C 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 obtained, gets Δ T for convenience of describing
_{h}unit be DEG C/m, be m for convenience of describing the unit getting Δ h; " R Cable Structure surface point " along the definition of the adjacent between two Cable Structure surface point of sea level elevation refer to only consider sea level elevation time, in " R Cable Structure surface point ", there is not 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; 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 geometric properties and the bearing data of Cable Structure, Cable Structure finds the annual position by sunshineduration those surface points the most sufficient, in " R Cable Structure surface point ", has at least a Cable Structure surface point to be annual by a point in sunshineduration the most fully those surface points in Cable Structure.
Second step: set up initial mechanical Calculation Basis model A
_{o}.
If total N root support cable, first determines the coding rule of rope, numbered by ropes all in Cable Structure by this rule, this numbering will be used for generating vector sum matrix in subsequent step.Determine measured point (i.e. the specified point of all characterisation of structures strain informations, is provided with K specified point), number to all specified points; Determine that the measured strain of each specified point (establishes the strain of L the assigned direction measuring each specified point, do not require that each specified point has the strain in the designated direction of same number, here the strain of L the assigned direction measuring each specified point is just established in order to describe conveniently), and give all measured strains numbering; Abovementioned numbering will be used for equally generating vector sum matrix in subsequent step.Each specified point can be exactly a point near the fixed endpoint (being such as the stiff end of dragline on bridge floor of cablestayed bridge) of each root rope, and this point should not be generally stress concentration point, to avoid occurring excessive strain measurement value; This numbering will be used for equally generating vector sum matrix in subsequent step.Only can measure the strain in a direction at each specified point, also can measure the strain of multiple directions." the whole monitored strain data of structure " by K specified point in the structure determined above, the strain of L assigned direction of crossing each specified point describes, the change of structural strain is exactly the change of the strain of all assigned directions of all specified points, all appointment straight line.Each total individual strain measurement value of M (M=K × L) or calculated value carry out the strain information of characterisation of structures.K and M must not be less than the quantity N of support cable.For simplicity, in the method by " the monitored strain data of structure " referred to as " monitored amount ".
When Cable Structure is completed, or before setting up health monitoring (damaged cable identification) system, obtain " Cable Structure steady temperature data " according to " the temperature survey calculating method of the Cable Structure of this method " survey calculation (to measure by ordinary temperature measuring method, thermal resistance is such as used to measure), " Cable Structure steady temperature data " now use vector T
_{o}represent, be called initial Cable Structure steady temperature data vector T
_{o}.T is obtained in actual measurement
_{o}while, namely at the synchronization in the moment of the initial Cable Structure steady temperature data vector of acquisition, use the direct survey calculation of conventional method to obtain the initial value of all monitored amount of Cable Structure, form monitored amount initial value vector C
_{o}.
Specifically the synchronization in moment of soandso Cable Structure steady temperature data vector such as (such as initial or current) can be being obtained according to following method in this method, soandso method survey calculation is used to obtain the data of the monitored amount of soandso measured amount (all monitored amount of such as 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) while, such as every 10 minutes survey records temperature, so simultaneously equally also every 10 minutes the monitored amount of soandso measured amount of survey record (all monitored amount of such as Cable Structure) data.Once determine the moment obtaining Cable Structure steady temperature data, so just be called the synchronization in the moment obtaining Cable Structure steady temperature data, the data of the monitored amount of soandso measured amount using soandso method survey calculation method to obtain with the data of the monitored amount of soandso measured amount (all monitored amount of such as Cable Structure) of the moment synchronization of acquisition Cable Structure steady temperature data.
Conventional method (consult reference materials or survey) is used to obtain temperature variant physical parameter (such as thermal expansivity) and the mechanical property parameters (such as elastic modulus, Poisson ratio) of the various materials that Cable Structure uses; Initial Cable Structure steady temperature data vector T is obtained at Actual measurement
_{o}while, namely at the synchronization in the moment of acquisition Cable Structure steady temperature data, use conventional method Actual measurement to obtain the Actual measurement data of Cable Structure.The Actual measurement data of Cable Structure comprise the measured data such as data, the initial geometric data of Cable Structure, rope force data, drawbar pull data, Cable Structure bearing generalized coordinate data, Cable Structure modal data, structural strain data, structure angle measurement of coordinates data, structure space measurement of coordinates data that the Nondestructive Testing Data of support cable etc. can express the health status of rope.Corresponding to A
_{o}cable Structure bearing generalized coordinate data form initial Cable Structure bearing generalized coordinate vector U
_{o}.The initial geometric data of Cable Structure can be the spatial data that the spatial data of the end points of all ropes adds a series of point in structure, and object is the geometric properties according to these coordinate data determination Cable Structure.For cablestayed bridge, initial geometric data can be the spatial data that the spatial data of the end points of all ropes adds some points on bridge two ends, socalled bridge type data that Here it is.The data utilizing the Nondestructive Testing Data etc. of support cable can express the health status of rope set up cable system initial damage vector d
_{o}.If there is no the Nondestructive Testing Data of rope and other are when can express the data of the health status of support cable, or when can think that structure original state is not damaged state, vectorial d
_{o}each element numerical value get 0.Cable system initial damage vector d
_{o}element number equal N, d
_{o}element and support cable be onetoone relationship, cable system initial damage vector d
_{o}element numerical value be not less than 0, be not more than 100%, d
_{o}element numerical value represent the degree of injury of corresponding support cable, if cable system initial damage vector d
_{o}the numerical value of a certain element be 0, represent that the support cable corresponding to this element is intact, no problem, if its numerical value is 100%, then represent that the support cable corresponding to this element has completely lost loadbearing capacity, if its numerical value is between 0 and 100%, then represent that this support cable loses the loadbearing capacity of corresponding proportion, if there is no the Nondestructive Testing Data of support cable and other are when can express the data of the health status of support cable, or when thinking that structure original state is not damaged state, vectorial d
_{o}each element numerical value get 0; If d
_{o}the numerical value of a certain element be not 0, then represent the degree of injury of the support cable corresponding to this element.The temperature variant physical and mechanical properties parameter of the various materials utilizing the measured data of the design drawing of Cable Structure, asconstructed drawing and initial Cable Structure, the Nondestructive Testing Data of support cable, Cable Structure to use, initial Cable Structure bearing generalized coordinate vector Uo and initial Cable Structure steady temperature data vector T
_{o}, utilize mechanics method (such as finite element method) to count " Cable Structure steady temperature data " and set up initial mechanical Calculation Basis model A
_{o}.
No matter which kind of method to obtain initial mechanical Calculation Basis model A by
_{o}, count " Cable Structure steady temperature data " (i.e. initial Cable Structure steady temperature data vector T
_{o}), based on A
_{o}the Cable Structure that calculates calculates data must closely its measured data, and error generally must not be greater than 5%.Like this can utility A
_{o}the Suo Li calculated under the analog case of gained calculates data, strain calculation data, Cable Structure shapometer count certificate and displacement meter counts certificate, Cable Structure angledata, Cable Structure spatial data etc., measured data when reliably truly occurring close to institute's analog case.Model A
_{o}the health status cable system initial damage vector d of middle support cable
_{o}represent, the initial Cable Structure steady temperature data vector T of Cable Structure steady temperature data
_{o}represent.Due to based on A
_{o}the initial value (actual measurement obtains) of the evaluation calculating all monitored amounts closely all monitored amounts, so also can be used in A
_{o}basis on, carry out Mechanics Calculation obtains, A
_{o}the evaluation of each monitored amount form monitored amount initial value vector C
_{o}.Corresponding to A
_{o}" Cable Structure steady temperature data " be exactly " initial Cable Structure steady temperature data vector T
_{o}"; Corresponding to A
_{o}support cable health status with cable system initial damage vector d
_{o}represent; Corresponding to A
_{o}the initial value monitored amount initial value vector C of all monitored amount
_{o}represent.Corresponding to A
_{o}cable Structure bearing generalized coordinate data initial Cable Structure bearing generalized coordinate vector U
_{o}represent; T
_{o}, U
_{o}and d
_{o}a
_{o}parameter, C
_{o}by A
_{o}mechanics Calculation result composition.
3rd step: first time sets up current initial mechanical Calculation Basis model A
^{t} _{o}, monitored amount current initial value vector C
^{t} _{o}" current initial Cable Structure steady temperature data vector T
^{t} _{o}", concrete grammar is: at initial time, and namely first time sets up current initial mechanical Calculation Basis model A
^{t} _{o}with monitored amount current initial value vector 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}", at initial time, (namely first time sets up A
^{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 Calculation Basis model A of Cable Structure
^{t} _{o}cable Structure bearing generalized coordinate data composition current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}; Set up the current initial mechanical Calculation Basis model A of Cable Structure for the first time
^{t} _{o}time, U
^{t} _{o}just equal U
_{o}.A
^{t} _{o}the health status of support cable and A
_{o}support cable health status (cable system initial damage vector d
_{o}represent) identical, A in cyclic process
^{t} _{o}the health status of support cable use cable system initial damage vector d all the time
_{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.
4th step: in Cable Structure military service process, the current data obtaining " 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).Current cable structure steady temperature data vector T is obtained in actual measurement
^{t}while, namely at acquisition current cable structure steady temperature data vector T
^{t}the synchronization in moment, actual measurement obtains the current measured value of all monitored amount of Cable Structure, composition " monitored amount current value vector C ".Current cable structure steady temperature data vector T is obtained in actual measurement
^{t}while, actual measurement obtains Cable Structure bearing generalized coordinate current data, all data composition current cable structure actual measurement bearing generalized coordinate vector U
^{t}.
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 current initial mechanical Calculation Basis model A where necessary
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, monitored amount current initial value vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o}.Current cable structure actual measurement bearing generalized coordinate vector U is obtained in the 4th step actual measurement
^{t}with current cable structure steady temperature data vector T
^{t}after, compare U respectively
^{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}, then do not need A
^{t} _{o}, U
^{t} _{o}and T
^{t} _{o}upgrade, otherwise need A
^{t} _{o}, U
^{t} _{o}and T
^{t} _{o}upgrade, update method is carried out to c step by following a step:
A step calculates U
^{t}with U
_{o}difference, U
^{t}with U
_{o}difference be exactly the front holder generalized displacement of Cable Structure bearing about initial position, with generalized displacement of support vector V represent generalized displacement of support, V equals U
^{t}deduct U
_{o}, be onetoone relationship between the element in generalized displacement of support vector V and generalized displacement of support component, in generalized displacement of support vector V, the numerical value of an element corresponds to the generalized displacement of an assigned direction of an appointment bearing.
B step calculates T
^{t}with T
_{o}difference, T
^{t}with T
_{o}difference be exactly the changes of current cable structure steady temperature data about initial Cable Structure steady temperature data, T
^{t}with T
_{o}difference represent with steady temperature change vector S, S equals T
^{t}deduct T
_{o}, S represents the change of Cable Structure steady temperature data.
C step is first to A
_{o}in Cable Structure bearing apply front holder generalized displacement constraint, the numerical value of front holder generalized displacement constraint just takes 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 of applying just takes from steady temperature change vector S, to A
_{o}middle Cable Structure bearing applies generalized displacement of support constraint and to A
_{o}in Cable Structure apply temperature variation after obtain upgrade current initial mechanical Calculation Basis model A
^{t} _{o}, upgrade A
^{t} _{o}while, U
^{t} _{o}all elements numerical value also uses U
^{t}all elements numerical value correspondence replaces, and namely have updated U
^{t} _{o}, T
^{t} _{o}all elements numerical value also uses T
^{t}all elements numerical value correspondence replace, namely have updated T
^{t} _{o}, so just obtain and correctly correspond to A
^{t} _{o}t
^{t} _{o}and U
^{t} _{o}; Upgrade C
^{t} _{o}method be: when renewal A
^{t} _{o}after, obtain A by Mechanics Calculation
^{t} _{o}in all monitored amounts, current concrete numerical value, these concrete numerical value composition C
^{t} _{o}.
6th step: at current initial mechanical Calculation Basis model A
^{t} _{o}basis on carry out several times Mechanics Calculation, obtain Cable Structure unit damage monitored amount transformation matrices Δ C and unit damage scalar D by calculating
_{u}.Concrete grammar is: Cable Structure unit damage monitored amount transformation matrices Δ C constantly updates, namely at the current initial mechanical Calculation Basis model A of renewal
^{t} _{o}with current cable structural bearings generalized coordinate vector U
^{t} _{o}while, Cable Structure unit damage monitored amount transformation matrices Δ C and unit damage scalar D must be upgraded simultaneously
_{u}; At the current initial mechanical Calculation Basis model A of Cable Structure
^{t} _{o}basis on carry out several times Mechanics Calculation, calculation times numerically equals the quantity of all ropes, has N root rope just to have N calculating, each time calculate hypothesis cable system in only have a rope to have unit damage D
_{u}(such as getting 5%, 10%, 20% or 30% equivalent damage is unit damage), occur in calculating each time that the rope damaged is different from during other time calculates the rope occurring damaging, calculate the current calculated value of all monitored amounts in Cable Structure each time, the current calculated value of all monitored amount calculated each time forms a monitored amount calculation current vector C; Calculate monitored amount calculation current vector C each time and deduct monitored amount current initial value vector C
^{t} _{o}obtain a monitored amount change vector; N root rope is had just to have N number of monitored amount change vector; The unit damage monitored amount transformation matrices Δ C having N to arrange is made up of successively this N number of monitored amount change vector; Each row of unit damage monitored amount transformation matrices correspond to a monitored amount change vector.
7th step: set up linear relationship error vector e and vectorial g.Utilize (the monitored amount current initial value vector C of data above
^{t} _{o}, unit damage monitored amount transformation matrices Δ C), while the 6th step calculates each time, namely calculate each time hypothesis cable system in only have a rope to have unit damage D
_{u}occur in calculating each time that the rope damaged is different from during other time calculates the rope occurring damaging, calculate the current value all utilizing mechanics method (such as adopting finite element method) to calculate all monitored amounts in cable system in Cable Structure each time, while calculating the monitored amount calculation current vector C of composition one each time, calculate composition injury vector d each time, this is walked out of existing injury vector d and only uses in this step, only has the numerical value of an element to get D in all elements of this injury vector d
_{u}, the numerical value of other element gets 0, and in injury vector d, numerical value is D
_{u}element correspond to this time calculate time unique damaged cable unit damage degree D
_{u}; By C, C
^{t} _{o}, Δ C, D
_{u}, d brings formula (12) into, obtain a linear relationship error vector e, calculate a linear relationship error vector e each time; Having N root rope just to have N calculating, just have N number of linear relationship error vector e, obtain a vector after being added by this N number of linear relationship error vector e, is exactly final linear relationship error vector e by each element of this vector divided by the new vector obtained after N.Vector g equals final error vector e.
8th step: the hardware components of pass line structural healthy monitoring system.Hardware components at least comprises: monitored amount monitoring system (such as containing strain measurement system, signal conditioner etc.), Cable Structure bearing generalized coordinate monitoring system (such as containing total powerstation, angular transducer, 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 communication alert equipment.Bearing generalized coordinate, each temperature of each monitored amount, each Cable Structure must arrive by monitored system monitoring, monitoring system by the Signal transmissions that monitors to signal (data) collector; Signal is delivered to computing machine through signal picker; The health monitoring software of the cable system running Cable Structure is then responsible for by computing machine, comprises the signal that the transmission of tracer signal collector comes; When monitoring rope and having damage, computer control communication panalarm is reported to the police to monitor staff, owner and (or) the personnel that specify.
9th step: by current for monitored amount initial value vector C
^{t} _{o}, unit damage monitored amount transformation matrices Δ C, unit damage scalar D
_{u}parameter is kept on the hard disc of computer of operation health monitoring systems software in the mode of data file.
Tenth step: establishment and on computers installation and operation generalized displacement of support temperature variation based on the damaged cable recognition methods system software of strain monitoring, the function (i.e. all work that can complete with computing machine in this specific implementation method) such as monitoring, record, control, storage, calculating, notice, warning that this software will complete this method " generalized displacement of support temperature variation is based on the damaged cable recognition methods of strain monitoring " required by task and wants
11 step: according to monitored amount current value vector C with monitored amount current initial value vector C
^{t} _{o}, unit damage monitored amount transformation matrices Δ C, unit damage scalar D
_{u}and cable system current nominal fatigue vector d(be made up of all Suo Dangqian nominal fatigue amounts) between exist linear approximate relationship (formula (8)), calculate the noninferior solution of cable system current nominal fatigue vector d according to multiobjective optimization algorithm, namely can determine the position of damaged cable and the solution of nominal fatigue degree thereof more exactly with reasonable error from all ropes.
The multiobjective optimization algorithm that can adopt has a variety of, such as: the multipleobjection optimization based on genetic algorithm, the multipleobjection optimization based on artificial neural network, the multiobjective optimization algorithm based on population, the multipleobjection optimization based on ant group algorithm, leash law (Constrain Method), weighted method (Weighted SUm Method), Objective Programming (Goal Attainment Method) etc.Because various multiobjective optimization algorithm is all conventional algorithm, can realize easily, this implementation step only provides the process solving current injury vector d for Objective Programming, the specific implementation process of other algorithm can realize in a similar fashion according to the requirement of its specific algorithm.
According to Objective Programming, formula (8) can transform the multiobjective optimization question shown in an accepted way of doing sth (16) and formula (17), in formula (16), γ is a real number, R is real number field, area of space Ω limits the span (each element of the present embodiment requirements vector d is not less than 0, is not more than 1) of each element of vectorial d.Formula (16) be meant to the minimum real number γ of searching one, formula (17) is met.In formula (17), G (d) is defined by formula (18), and the middle deviation allowed between G (d) and vectorial g of the product representation formula (17) of weighing vector W and γ in formula (17), the definition of g is see formula (13), and its value calculates in the 7th step.During actual computation, vector W can be identical with vectorial g.The concrete programming realization of Objective Programming has had universal program directly to adopt.Use Objective Programming just can in the hope of cable system current nominal fatigue vector d.
G(d)Wγ≤g (17)
The element number of cable system current nominal fatigue vector d equals the quantity of rope, be onetoone relationship between the element of cable system current nominal fatigue vector d and rope, the element numerical value of cable system current nominal fatigue vector d represents the nominal fatigue degree of corresponding rope or nominal health status.Vector d the coding rule of element and vectorial d
_{o}the coding rule of element identical.
12 step: definition cable system current actual damage vector d
^{a}, cable system current actual damage vector d
^{a}element number equal the quantity of support cable, cable system current actual damage vector d
^{a}element and support cable between be onetoone relationship, cable system current actual damage vector d
^{a}element numerical value represent the actual damage degree of corresponding support cable or actual health status; Vector d
^{a}the coding rule of element and vectorial d
_{o}the coding rule of element identical.The cable system utilizing formula (15) to express current actual damage vector d
^{a}a jth element d
^{a} _{j}with cable system initial damage vector d
_{o}a jth element d
_{oj}with a jth element d of cable system current nominal fatigue vector d
_{j}between relation, calculate cable system current actual damage vector d
^{a}all elements; d
^{a} _{j}represent jth root support cable not damaged when being 0, when being 100%, represent that this support cable thoroughly loses loadbearing capacity, time between 0 and 100%, represent that jth root support cable loses the loadbearing capacity of corresponding proportion; That is cable system current actual damage vector d
^{a}element numerical value represent the degree of injury of corresponding support cable, so according to cable system current actual damage vector d
^{a}impaired and the degree of injury of which rope can be defined, namely achieve damaged cable identification or the health monitoring of cable system in Cable Structure.
13 step: the computing machine in health monitoring systems regularly generates cable system health condition form automatically or by human users's health monitoring systems.
14 step: under specified requirements, the computing machine automatic operation communication alert equipment in health monitoring systems is reported to the police to monitor staff, owner and (or) the personnel that specify.
15 step: get back to the 4th step, starts by the circulation of the 4th step to the 15 step.
Claims (1)
1. generalized displacement of support temperature variation is based on a damaged cable recognition methods for strain monitoring, it is characterized in that described method comprises:
A. establish total N root support cable, first determine the coding rule of support cable, support cables all in Cable Structure numbered by this rule, this numbering will be used for generating vector sum matrix in subsequent step; Determine the point being monitored of specifying, namely point being monitored characterizes all specified points of Cable Structure strain information, and gives all specified points numbering; Determine monitored should the changing direction of point being monitored, and give all monitored strain numberings of specifying; " monitored strain numbering " will be used for generating vector sum matrix in subsequent step; " 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 of point being monitored must not be less than the quantity of support cable; The quantity sum of all monitored amounts must not be less than the quantity of support cable; Must not be greater than 30 minutes to the time interval between any twice measurement of same amount RealTime Monitoring in this method, the moment of survey record data is called the physical record data moment;
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 environment residing for Cable Structure composition material and Cable Structure, utilize the geometry measured data of the design drawing of Cable Structure, asconstructed drawing and Cable Structure, utilize these data and parameter to set up the Thermodynamic calculation model of Cable Structure, inquiry Cable Structure location is no less than the meteorological data in recent years of 2 years, the statistics cloudy quantity obtained is during this period of time designated as T cloudy day, in the method daytime can not be seen one of the sun and be called the cloudy day all day, statistics obtains 0 highest temperature after sunrise moment next day between 30 minutes and the lowest temperature at each cloudy day in T cloudy day, the sunrise moment refers to the sunrise moment on the meteorology that base area revolutions and revolution rule are determined, do not represent that the same day necessarily can see the sun, data can be inquired about or calculated sunrise moment of each required day by conventional meteorology, 0 highest temperature after sunrise moment next day between 30 minutes at each cloudy day deducts the maximum temperature difference that the lowest temperature is called the daily temperature at this cloudy day, there is T cloudy day, just there is the maximum temperature difference of the daily temperature at T cloudy day, the maximal value of getting in the maximum temperature difference of the daily temperature at T cloudy day is reference temperature difference per day, Δ T is designated as with reference to temperature difference per day
_{r}, be no less than between inquiry Cable Structure location and Altitude Region, place temperature that the meteorological data in recent years of 2 years or actual measurement obtain environment residing for Cable Structure in time with delta data and the Changing Pattern of sea level elevation, calculate to be no less than 2 years between Cable Structure location and Altitude Region, place Cable Structure in recent years residing for the temperature of environment about the maximum rate of change Δ T of sea level elevation
_{h}, get Δ T for convenience of describing
_{h}unit be DEG C/m, the surface of Cable Structure is got " R Cable Structure surface point ", the Specific Principles getting " R Cable Structure surface point " describes in step b3, the temperature of this R Cable Structure surface point will be obtained below by actual measurement, claiming to survey the temperature data obtained is " R Cable Structure surface temperature measured data ", if utilize the Thermodynamic calculation model of Cable Structure, obtained the temperature of this R Cable Structure surface point by Calculation of Heat Transfer, just claim the temperature data that calculates for " R Cable Structure land surface pyrometer count certificate ", from the minimum height above sea level residing for Cable Structure to most High aititude, in Cable Structure, uniform choosing is no less than three different sea level elevations, at the sea level elevation place that each is chosen, two points are at least chosen 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 chosen 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 in the shade the outer normal direction of the measurement Cable Structure chosen along the sunny slope outer normal direction and Cable Structure that must comprise Cable Structure in the direction of the Temperature Distribution of wall thickness, three points are no less than along each measurement Cable Structure along direction uniform choosing in Cable Structure of the Temperature Distribution of wall thickness, along each, Cable Structure is measured for support cable and only gets a point along the direction of the Temperature Distribution of wall thickness, only measure the temperature of the surface point of support cable, measure all temperature be selected a little, the temperature recorded 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 " to 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 have chosen the individual different sea level elevation of H, at each sea level elevation place, have chosen B and measure the direction of Cable Structure along the Temperature Distribution of wall thickness, in Cable Structure, E point is have chosen along each measurement Cable Structure along the direction of the Temperature Distribution of wall thickness, wherein H and E is not less than 3, B is not less than 2, 1 is equaled for support cable E, what meter Cable Structure " measured the point of Cable Structure along the temperature profile data of thickness " adds up to HBE, the temperature of this HBE " measuring the point of Cable Structure along the temperature profile data of thickness " will be obtained below by actual measurement, claiming to survey the temperature data obtained is " HBE Cable Structure is along thickness temperature measured data ", if utilize the Thermodynamic calculation 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, the temperature data calculated just is claimed to be " HBE Cable Structure calculates data along thickness temperature ", measure temperature in Cable Structure location according to meteorology to require to choose a position, obtain meeting the temperature that meteorology measures the Cable Structure place environment of temperature requirement by the actual measurement of this position, 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 this day getable, at the flat board of this position of sound production one piece of carbon steel material, 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 with 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 this day getable, the nonsunny slope of reference plate is covered with insulation material, RealTime Monitoring is obtained 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 meeting the temperature record that meteorology measures the Cable Structure place environment of temperature requirement simultaneously, the temperature measured data sequence of the Cable Structure place environment after sunrise moment next day between 30 minutes is obtained being carved at sunrise the same 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 of the Cable Structure place environment after being carved into the sunrise moment next day same day at sunrise between 30 minutes, find the maximum temperature in the temperature measured data sequence of Cable Structure place environment and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains Cable Structure place environment after sunrise moment next day between 30 minutes is deducted 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}, calculated the rate of change of temperature about the time of Cable Structure place environment by Conventional mathematical by the temperature measured data sequence of Cable Structure place environment, this rate of change is also along with time variations, the measured data sequence of the temperature of the sunny slope of the reference plate after sunrise moment next day between 30 minutes is obtained being carved at sunrise the same 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 of the temperature of the sunny slope of the reference plate after being carved into the sunrise moment next day same day at sunrise between 30 minutes, find the maximum temperature in the measured data sequence of the temperature of the sunny slope of reference plate and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains the temperature of the sunny slope of reference plate after sunrise moment next day between 30 minutes is deducted 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}, the Cable Structure surface temperature measured data sequence of all R Cable Structure surface points after sunrise moment next day between 30 minutes is obtained being carved at sunrise the same day by RealTime Monitoring, R Cable Structure surface point is had 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 the Cable Structure surface temperature measured data after being carved into the sunrise moment next day same day of a Cable Structure surface point at sunrise between 30 minutes, find the maximum temperature in each Cable Structure surface temperature measured data sequence and minimum temperature, the maximum temperature difference be carved at sunrise on same day that minimum temperature obtains the temperature of each Cable Structure surface point after sunrise moment next day between 30 minutes is deducted 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}, calculated the rate of change of temperature about the time of each Cable Structure surface point by Conventional mathematical by each Cable Structure surface temperature measured data sequence, the temperature of each Cable Structure surface point about the rate of change of time also along with time variations, 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 difference amounting to maximum temperature in BE " identical sea level elevation Cable Structure is along the temperature profile data of thickness " and minimum temperature at the sea level elevation place that each is chosen, the absolute value of this difference is called " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", have chosen H different sea level elevation just to have H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference ", the maximal value in this H " identical sea level elevation place Cable Structure thickness direction maximum temperature difference " is claimed to be " Cable Structure thickness direction maximum temperature difference ", be designated as Δ T
_{tmax},
B3: survey calculation obtains Cable Structure steady temperature data, first, determine the moment obtaining Cable Structure steady temperature data, the condition relevant to the moment determining to obtain Cable Structure steady temperature data has six, Section 1 condition is moment of obtaining Cable Structure steady temperature data between after being carved into sunrise moment next day at sunset between 30 minutes on same day, the sunset moment refers to the sunset moment on base area revolutions and the meteorology determined of revolution rule, can inquire about data or be calculated sunset moment of each required day by conventional meteorology, the a condition of Section 2 condition be after being carved into sunrise moment next day at sunrise between 30 minutes on same day 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 into sunrise moment next day at sunrise between 30 minutes on same day during this period of time in, the environment maximum temperature difference Δ T that survey calculation obtains 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}Δ T is not more than after deducting 2 degrees Celsius
_{emax}, and Cable Structure surface maximum temperature difference Δ T
_{smax}be not more than Δ T
_{pmax}, one of only need meet in a condition of Section 2 and b condition is just called and meets Section 2 condition, Section 3 condition is when obtaining Cable Structure steady temperature data, and 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, Section 4 condition is when obtaining Cable Structure steady temperature data, and 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, Section 5 condition is when obtaining 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 be carved into the minimal value after sunrise moment next day between 30 minutes the same day at sunrise, Section 6 condition is when obtaining Cable Structure steady temperature data, " Cable Structure thickness direction maximum temperature difference " Δ T
_{tmax}be not more than 1 degree Celsius, this method utilizes abovementioned six conditions, any one in following three kinds of moment is called " the mathematics moment obtaining Cable Structure steady temperature data ", the first moment meets the moment of the Section 1 in abovementioned " condition relevant to the moment determining to obtain Cable Structure steady temperature data " to Section 5 condition, the second moment is moment of the Section 6 condition only met in abovementioned " condition relevant to determining to obtain moment of Cable Structure steady temperature data ", simultaneously the third moment meets the moment of the Section 1 in abovementioned " condition relevant to the moment determining to obtain Cable Structure steady temperature data " to Section 6 condition, when the mathematics moment obtaining Cable Structure steady temperature data is exactly a moment in this method in the physical record data moment, the moment obtaining Cable Structure steady temperature data is exactly the mathematics moment obtaining Cable Structure steady temperature data, if the mathematics moment obtaining Cable Structure steady temperature data is not any one moment in this method in the physical record data moment, then getting this method closest to moment of those physical record data in the mathematics moment obtaining Cable Structure steady temperature data is the moment obtaining Cable Structure steady temperature data, the amount being used in the moment survey record obtaining Cable Structure steady temperature data is carried out Cable Structure relevant health monitoring analysis by this method, this method is similar to thinks that the Cable Structure temperature field in the moment obtaining Cable Structure steady temperature data is in stable state, and namely the Cable Structure temperature in this moment does not change in time, 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 obtaining Cable Structure steady temperature data, utilize the Thermodynamic calculation model of Cable Structure, the Temperature Distribution of the Cable Structure in the moment obtaining Cable Structure steady temperature data is calculated by conventional heat transfer, now the temperature field of Cable Structure calculates by stable state, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculated comprises the accounting temperature of R Cable Structure surface point in Cable Structure, the accounting temperature of R Cable Structure surface point is called that R Cable Structure steadystate surface temperature calculates 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 calculates data along thickness temperature ", when R Cable Structure surface temperature measured data and R Cable Structure steadystate surface temperature calculate data correspondent equal, and when " HBE Cable Structure is along thickness temperature measured data " and " HBE Cable Structure calculates data along thickness temperature " correspondent equal, the temperature profile data of the Cable Structure in the moment in acquisition Cable Structure steady temperature data calculated is called " Cable Structure steady temperature data " in the method, " R Cable Structure surface temperature measured data " is now called " R Cable Structure steadystate 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 ", when the surface of Cable Structure is got " R Cable Structure surface point ", the quantity of " R Cable Structure surface point " must meet three conditions with distribution, first condition is when Cable Structure temperature field is in stable state, when the temperature of Cable Structure any point be on the surface by " R Cable Structure surface point " in obtain with the observed temperature linear interpolation of the Cable Structure point that this arbitrfary point is adjacent on the surface time, the error of the Cable Structure that linear interpolation the obtains temperature of this arbitrfary point and the Cable Structure actual temperature of this arbitrfary point on the surface is on the surface not more than 5%, Cable Structure surface comprises support cable surface, second condition is not less than 4 in the quantity of the point of same sea level elevation in " R Cable Structure surface point ", 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 DEG C 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 obtained, gets Δ T for convenience of describing
_{h}unit be DEG C/m, be m for convenience of describing the unit getting Δ h, " R Cable Structure surface point " along the definition of the adjacent between two Cable Structure surface point of sea level elevation refer to only consider sea level elevation time, in " R Cable Structure surface point ", there is not 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, 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 geometric properties and the bearing data of Cable Structure, Cable Structure finds the annual position by sunshineduration those surface points the most sufficient, in " R Cable Structure surface point ", has at least a Cable Structure surface point to be annual by a point in sunshineduration the most fully those surface points in Cable Structure,
C. the Cable Structure steady temperature data under original state are obtained according to " the temperature survey calculating method of the Cable Structure of this method " direct survey calculation, 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}"; Survey or consult reference materials and obtain the temperature variant physical and mechanical properties parameter of the various materials that Cable Structure uses; T is obtained in actual measurement
_{o}while, namely at the initial Cable Structure steady temperature data vector T of acquisition
_{o}the synchronization in moment, direct survey calculation obtains the measured data of initial Cable Structure, and the measured data of initial Cable Structure comprises the Nondestructive Testing Data of the health status expressing support cable, the initial value of all monitored amounts, the Initial cable force data of all support cables, initial Cable Structure modal data, initial Cable Structure strain data, initial Cable Structure geometric data, Cable Structure bearing generalized coordinate data, initial Cable Structure spatial data; The initial value of all monitored amounts forms monitored amount initial value vector C
_{o}; The Nondestructive Testing Data that utilization can express the health status of support cable sets up cable system initial damage vector d
_{o}, cable system initial damage vector d
_{o}element number equal N, d
_{o}element and support cable be onetoone relationship, cable system initial damage vector d
_{o}element numerical value represent the degree of injury of corresponding support cable, if cable system initial damage vector d
_{o}the numerical value of a certain element be 0, represent that the support cable corresponding to this element is intact, do not damage, if its numerical value is 100%, then represent that the support cable corresponding to this element completely loses loadbearing capacity, if its numerical value is between 0 and 100%, then represent that this support cable loses the loadbearing capacity of corresponding proportion, if there is no the Nondestructive Testing Data of support cable and other are when can express the data of the health status of support cable, or when thinking that Cable Structure original state is not damaged state, vectorial d
_{o}each element numerical value get 0; Corresponding to A
_{o}cable Structure bearing generalized coordinate data form initial Cable Structure bearing generalized coordinate vector U
_{o}; Bearing generalized coordinate comprises line amount and angular amount two kinds;
Temperature variant physical and mechanical properties parameter, the initial Cable Structure bearing generalized coordinate vector U of the various materials d. used according to the measured data of the design drawing of Cable Structure, asconstructed drawing and initial Cable Structure, the Nondestructive Testing Data of support cable, Cable Structure
_{o}, initial Cable Structure steady temperature data vector T
_{o}with all Cable Structure data that preceding step obtains, set up the initial mechanical Calculation Basis model A counting the Cable Structure of " Cable Structure steady temperature data "
_{o}, based on A
_{o}the Cable Structure that calculates calculates data must closely its measured data, 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}support cable health status with cable system initial damage vector d
_{o}represent; Corresponding to A
_{o}the initial value monitored amount initial value vector C of all monitored amount
_{o}represent; First time sets up the current initial mechanical Calculation Basis model A counting the Cable Structure of " Cable Structure steady temperature data "
^{t} _{o}, monitored amount current initial value vector C
^{t} _{o}" current initial Cable Structure steady temperature data vector T
^{t} _{o}"; Set up the current initial mechanical Calculation Basis model A of Cable Structure for the first time
^{t} _{o}with monitored amount current initial value vector C
^{t} _{o}time, the current initial mechanical Calculation Basis model A of Cable Structure
^{t} _{o}just equal the initial mechanical Calculation Basis model A of Cable Structure
_{o}, monitored amount current initial value vector 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 the current initial mechanical Calculation Basis model A of Cable Structure for the first time
^{t} _{o}time, T
^{t} _{o}just equal T
_{o}; Corresponding to the current initial mechanical Calculation Basis model A of Cable Structure
^{t} _{o}cable Structure bearing generalized coordinate data composition current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, set up the current initial mechanical Calculation Basis model A of Cable Structure for the first time
^{t} _{o}time, U
^{t} _{o}just equal U
_{o}; A
^{t} _{o}the initial health of support cable and A
_{o}the health status of support cable identical, also use cable system initial damage vector d
_{o}represent, A in cyclic process below
^{t} _{o}the initial health of support cable use cable system initial damage vector d all the time
_{o}represent; T
_{o}, U
_{o}and d
_{o}a
_{o}parameter, by A
_{o}the initial value of all monitored amount that obtains of Mechanics Calculation result and C
_{o}the initial value of all monitored amount represented is identical, therefore alternatively 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; A in the method
_{o}, U
_{o}, C
_{o}, d
_{o}and T
_{o}constant;
E. from entering the circulation being walked to m step by e here; In Cable Structure military service process, the current data of " Cable Structure steady temperature data " is constantly obtained according to " the temperature survey calculating method of the Cable Structure of this method " continuous Actual measurement, 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; Current cable structure steady temperature data vector T is obtained 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 structure actual measurement bearing generalized coordinate vector U
^{t};
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 Calculation Basis model A according to step f1 to f3
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, monitored amount current initial value vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o};
F1. U is compared respectively
^{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}, then 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}, C
^{t} _{o}and T
^{t} _{o}upgrade;
F2. U is calculated
^{t}with U
_{o}difference, U
^{t}with U
_{o}difference be exactly the front holder generalized displacement of Cable Structure bearing about initial position, with generalized displacement of support vector V represent generalized displacement of support, V equals U
^{t}deduct U
_{o}, be onetoone relationship between the element in generalized displacement of support vector V and generalized displacement of support component, in generalized displacement of support vector V, the numerical value of an element corresponds to the generalized displacement of an assigned direction of an appointment bearing; Calculate T
^{t}with T
_{o}difference, T
^{t}with T
_{o}difference be exactly the changes of current cable structure steady temperature data about initial Cable Structure steady temperature data, T
^{t}with T
_{o}difference represent with steady temperature change vector S, S equals T
^{t}deduct T
_{o}, S represents the change of Cable Structure steady temperature data;
F3. first to A
_{o}in Cable Structure bearing apply front holder generalized displacement constraint, the numerical value of front holder generalized displacement constraint just takes 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 of applying just takes from steady temperature change vector S, to A
_{o}middle Cable Structure bearing applies generalized displacement of support constraint and to A
_{o}in Cable Structure apply temperature variation after obtain upgrade current initial mechanical Calculation Basis model A
^{t} _{o}, upgrade A
^{t} _{o}while, U
^{t} _{o}all elements numerical value also uses U
^{t}all elements numerical value correspondence replaces, and namely have updated U
^{t} _{o}, T
^{t} _{o}all elements numerical value also uses T
^{t}all elements numerical value correspondence replace, namely have updated T
^{t} _{o}, so just obtain and correctly correspond to A
^{t} _{o}t
^{t} _{o}and U
^{t} _{o}; Upgrade C
^{t} _{o}method be: when renewal A
^{t} _{o}after, obtain A by Mechanics Calculation
^{t} _{o}in all monitored amounts, current concrete numerical value, these concrete numerical value composition C
^{t} _{o}; A
^{t} _{o}the initial health of support cable use cable system initial damage vector d all the time
_{o}represent;
G. at current initial mechanical Calculation Basis 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 amount transformation matrices Δ C and unit damage scalar D by calculating
_{u};
G1. Cable Structure unit damage monitored amount transformation matrices Δ C constantly updates, namely at the current initial mechanical Calculation Basis model A of renewal
^{t} _{o}, current initial Cable Structure bearing generalized coordinate vector U
^{t} _{o}, monitored amount current initial value vector C
^{t} _{o}with current initial Cable Structure steady temperature data vector T
^{t} _{o}afterwards, Cable Structure unit damage monitored amount transformation matrices Δ C and unit damage scalar D must then be upgraded
_{u};
G2. at the current initial mechanical Calculation Basis model A of Cable Structure
^{t} _{o}basis on carry out several times Mechanics Calculation, calculation times numerically equals the quantity of all ropes, has N root support cable just to have N calculating, each time calculate hypothesis cable system in only have a support cable to have unit damage scalar D
_{u}occur in calculating each time that the rope damaged is different from during other time calculates the rope occurring damaging, calculate the current calculated value of all monitored amounts in Cable Structure each time, the current calculated value of all monitored amount calculated each time forms a monitored amount calculation current vector, element number rule and the monitored amount initial value vector C of monitored amount calculation current vector
_{o}element number rule identical;
G3. the monitored amount calculation current vector calculated each time deducts monitored amount current initial value vector C
^{t} _{o}obtain a monitored amount change vector; N root support cable is had just to have N number of monitored amount change vector;
G4. the Cable Structure unit damage monitored amount transformation matrices Δ C having N to arrange is made up of successively this N number of monitored amount change vector; Each row of Cable Structure unit damage monitored amount transformation matrices Δ C correspond to a monitored amount change vector;
H. current cable structure steady temperature data vector T is obtained in actual measurement
^{t}while, actual measurement obtains at acquisition current cable structure steady temperature data vector T
^{t}the current measured value of all monitored amount of Cable Structure of synchronization in moment, form monitored amount current value vector C; Monitored amount current value vector C and monitored amount current initial value vector 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 not concrete numerical value in the same time;
I. cable system current nominal fatigue vector d is defined, the element number of cable system current nominal fatigue vector d equals the quantity of support cable, be onetoone relationship between the element of cable system current nominal fatigue vector d and support cable, the element numerical value of cable system current nominal fatigue vector d represents the nominal fatigue degree of corresponding support cable or nominal health status; The coding rule of the element of vector d and vectorial d
_{o}the coding rule of element identical;
J. according to monitored amount current value vector C with monitored amount current initial value vector C
^{t} _{o}, Cable Structure unit damage monitored amount transformation matrices Δ C, unit damage scalar D
_{u}and the linear approximate relationship existed between cable system to be asked current nominal fatigue vector d, this linear approximate relationship can be expressed as formula 1, and other amount in formula 1 except d is known, solves formula 1 and just can calculate cable system current nominal fatigue vector d;
K. cable system current actual damage vector d is defined
^{a}, cable system current actual damage vector d
^{a}element number equal the quantity of support cable, cable system current actual damage vector d
^{a}element and support cable between be onetoone relationship, cable system current actual damage vector d
^{a}element numerical value represent the actual damage degree of corresponding support cable or actual health status; Vector d
^{a}the coding rule of element and vectorial d
_{o}the coding rule of element identical;
L. the cable system utilizing formula 2 to express current actual damage vector d
^{a}a jth element d
^{a} _{j}with cable system initial damage vector d
_{o}a jth element d
_{oj}with a jth element d of cable system current nominal fatigue vector d
_{j}between relation, calculate cable system current actual damage vector d
^{a}all elements;
J=1 in formula 2,2,3 ...., N, d
^{a} _{j}represent jth root support cable not damaged when being 0, when being 100%, represent that this rope thoroughly loses loadbearing capacity, time between 0 and 100%, represent that jth root support cable loses the loadbearing capacity of corresponding proportion; Cable system current actual damage vector d
^{a}element numerical value represent the degree of injury of corresponding support cable, so according to cable system current actual damage vector d
^{a}impaired and the degree of injury of which rope can be defined, namely achieve damaged cable identification or the health monitoring of cable system in Cable Structure;
M. get back to e step, start the circulation next time being walked to m step by e.
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