CN102288435A - Health monitoring method of cable system based on cable force monitoring during angular displacement of support - Google Patents
Health monitoring method of cable system based on cable force monitoring during angular displacement of support Download PDFInfo
- Publication number
- CN102288435A CN102288435A CN2011101226497A CN201110122649A CN102288435A CN 102288435 A CN102288435 A CN 102288435A CN 2011101226497 A CN2011101226497 A CN 2011101226497A CN 201110122649 A CN201110122649 A CN 201110122649A CN 102288435 A CN102288435 A CN 102288435A
- Authority
- CN
- China
- Prior art keywords
- cable
- current
- vector
- monitored
- bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
A health monitoring method of a cable system based on cable force monitoring during the angular displacement of a support is based on the cable force monitoring, and is to decide whether a mechanical calculation reference model of a structure needs to be updated by monitoring the angular coordinates of the structure support, and the mechanical calculation reference model of the structure is updated only when the angular coordinates of the structure support are changed, so that a new mechanical calculation reference model of the structure which is included in the angular displacement of the structure support is obtained; and the change matrix of a unit damage monitored value can be obtained through calculation on the basis of the model. A non-inferior solution of a current cable damage vector can be quickly calculated through an appropriate algorithm like a multi-target optimization algorithm and the like according to approximate linear relationships between the current value vector of the monitored value and the initial vector of the monitored value, the change matrix of the unit damage monitored value, a unit damage scalar and the current damage vector of the cable system to be solved; and based on this, the position and the damage degree of a damaged cable can be accurately determined during the angular displacement of the support.
Description
Technical field
The structures such as cable-stayed bridge, suspension bridge, truss structure have a common ground, be exactly that they have many parts that bear tensile load, such as suspension cable, main push-towing rope, hoist cable, pull bar etc., the common ground of this class formation is that the present invention is " Cable Structure " with such structure representation for simplicity take rope, cable or the rod member that only bears tensile load as support unit. (for example bearing is around the rotation of reference axis X, Y, Z in that angular displacement of support is arranged, in fact be exactly that bearing is around the angular displacement of reference axis X, Y, Z) time, the present invention is based on cable force monitoring identifies the supporting system of Cable Structure and (refers to all ropeway carrying-ropes, and all rod members that only bear tensile load that play supporting role, for simplicity, this patent is called " cable system " with whole support unit unifications of this class formation, but in fact cable system not only refers to support cable, also comprise the rod member that only bears tensile load) in damaged cable (truss structure is just referred to the impaired rod member that only bears tensile load), belong to the engineering structure health monitoring field.
Background technology
Cable system is the key components of Cable Structure normally, its inefficacy usually brings the inefficacy of total, and the damaged cable (also referring to only bear as previously mentioned the rod member of tensile load) of identifying based on structural health monitoring technology in the cable system of Cable Structure is a kind of method that has potentiality. After the health status of cable system changes; can cause the variation of the measurable parameter of structure; for example can cause the variation of supporting cable force; in fact the variation of Suo Li has comprised the health status information of cable system; that is to say the health status that to utilize the rope force data to judge structure; can (the present invention be called monitored Suo Li " monitored amount " based on cable force monitoring; the back is mentioned " monitored amount " and is just referred to monitored Suo Li) identify damaged cable; monitored amount is except the impact that is subjected to the cable system health status; also can be subjected to the impact of Cable Structure angular displacement of support (usually can occur), also not have at present a kind of disclosed, effective health monitoring systems and method to solve this problem.
When angular displacement of support is arranged, in order reliable monitoring and judgement to be arranged to the health status of the cable system of Cable Structure, must there be one can rationally effectively set up the Suo Li variation of each root rope with the method for the relation between the health status of all ropes in the cable system, can provides the health evaluating of more believable cable system based on the health monitoring systems of the method foundation.
Summary of the invention
Technical problem:The objective of the invention is when the Cable Structure bearing has angular displacement, for the health monitoring problem of cable system in the Cable Structure, disclose a kind of based on health monitor method cable force monitoring, that can monitor rationally and effectively cable system in the Cable Structure.
Technical scheme:The present invention is comprised of three parts. Respectively the method for setting up the required knowledge base of cable system health monitoring systems and parameter, based on the Suo Li of knowledge base (containing parameter) and each root rope of actual measurement and the cable system health status appraisal procedure of actual measurement Cable Structure angular displacement of support, the software and hardware part of health monitoring systems.
First of the present invention: set up for the knowledge base of cable system health monitoring and the method for parameter. Specific as follows:
1. set up the initial mechanical calculating benchmark model A of Cable Structureo(for example finite element benchmark model) and current Mechanics Calculation benchmark model At oThe method of (for example finite element benchmark model). A in the present inventionoConstant. At oConstantly update. Set up Ao, set up and upgrade At oMethod as follows.
Set up AoThe time, measured data according to the Cable Structure in the Cable Structure completion (comprises the measured datas such as Cable Structure shape data, rope force data, draw-bar pull data, Cable Structure support coordinate data, Cable Structure bearing angular data, Cable Structure modal data, to cable-stayed bridge, suspension bridge and bridge type data of Yan Shiqiao, rope force data, the modal data of bridge, the Non-destructive Testing Data of rope etc. can be expressed the data of the health status of rope) and design drawing, as-built drawing, utilize mechanics method (for example FInite Element) to set up Ao If there is not the measured data of the structure in the Cable Structure completion, so just before setting up health monitoring systems, structure is surveyed, the measured data that obtains Cable Structure (comprises the measured datas such as Cable Structure shape data, rope force data, draw-bar pull data, Cable Structure support coordinate data, Cable Structure bearing angular data, Cable Structure modal data, to cable-stayed bridge, suspension bridge and bridge type data of Yan Shiqiao, rope force data, the modal data of bridge, the Non-destructive Testing Data of rope etc. can be expressed the data of the health status of rope), according to design drawing, the as-built drawing of these data and Cable Structure, utilize mechanics method (for example FInite Element) to set up Ao No matter which kind of method to obtain A witho, based on AoThe Cable Structure calculated data that calculates (to cable-stayed bridge, suspension bridge and the modal data of the bridge type data of Yan Shiqiao, rope force data, bridge) must be very near its measured data, and error generally must not be greater than 5%. But such utility AoStrain calculated data, Suo Li calculated data, Cable Structure shape calculated data and displacement calculated data, Cable Structure angle-data etc. under the analog case of calculating gained, the measured data when truly occuring near institute's analog case reliably. Corresponding to AoCable Structure bearing angular data form initial Cable Structure bearing angular coordinate vectorU o。
In Cable Structure military service process, constantly actual measurement obtains Cable Structure bearing angular coordinate current data (all data composition current cable structure actual measurement bearing angular coordinate vectorsU t , vectorU t Definition mode with the vectorUIdentical). Cable Structure bearing angular coordinate current data when for simplicity, the last time being upgraded current Mechanics Calculation benchmark model is designated as current cable structural bearings angular coordinate vectorU t o Set up and renewal At oMethod be: at initial time, At oJust equal Ao，
U t oJust equalU o In Cable Structure military service process, constantly actual measurement obtains Cable Structure bearing angular data and obtains current cable structure actual measurement bearing angular coordinate vectorU t If,U t EqualU t o, then do not need At oUpgrade; IfU t Be not equal toU t o, then need At oUpgrade, at this momentU t WithU oDifference be exactly the Cable Structure bearing about initial position (corresponding to Ao) angular displacement of supportV, upgrade At oMethod be to AoIn the Cable Structure bearing apply displacement constraint (its numerical value taken from the angular displacement of support vectorV) after the current Mechanics Calculation benchmark model A that obtains upgradingt o, upgrade At oThe time,U t oAll elements numerical value is also usedU t All elements numerical value replaces, and has namely upgradedU t o, so just obtained correctly corresponding to At o{。##.##1},U t o。
If total in the cable systemNRoot support cable, structure rope force data just byNThe Suo Li of root support cable describes. For simplicity, in the present invention with " the monitored rope force data of structure " referred to as " monitored amount ". When mentioning in the back " so-and-so matrix of monitored amount or so-and-so vector ", also can be read as " Suo Li so-and-so matrix or so-and-so vector ".
Among the present invention with monitored amount initial vectorC o The vector (seeing formula (1)) that the initial value of all monitored amounts of expression Cable Structure forms. Requirement is obtaining AoIn time, obtainC o Because of subject to the foregoing, the monitored amount of calculating gained based on the calculating benchmark model of Cable Structure in the narration of back, will represent this calculated value and measured value reliably close to the measured data of initial monitored amount with prosign.
In the formula (1)C oj (
j =1, 2, 3, ……
., N) be in the Cable StructurejThe primary quantity of individual monitored amount, this component according to coding rule corresponding to specificjIndividual monitored amount.TThe transposition of expression vector (together rear).
Vectorial with monitored amount current value among the present inventionCThe vector (formula (2) is seen in definition) that is formed by the currency of all monitored amounts in the Cable Structure.
In the formula (2)C j (
j =1, 2, 3, ……
., N) be in the Cable StructurejThe currency of individual monitored amount, this componentC j According to coding rule withC oj Corresponding to same " monitored amount ".
2. set up and renewal Cable Structure unit damage monitored quantitative change matrixΔCMethod。
Cable Structure unit damage monitored quantitative change matrixΔCConstantly update, namely upgrading current Mechanics Calculation benchmark model At oThe time, upgrade Cable Structure unit damage monitored quantitative change matrixΔC Concrete grammar is as follows:
Current Mechanics Calculation benchmark model A in Cable Structuret oThe basis on carry out several times and calculate, equal the quantity of all support cables on the calculation times numerical value. Calculating each time in the hypothesis cable system only has a support cable that unit damage is arrangedD u (for example getting 5%, 10%, 20% or 30% equivalent damage is unit damage), the rope that occurs damage in calculating each time is different from the rope that occurs damage in other time calculating, calculate each time the current calculated value all utilize mechanics method (for example FInite Element) to calculate all monitored amounts of Cable Structure, the current calculated value of the monitored amount of all that calculate each time forms a monitored amount calculation current vector (when hypothesis theiWhen the root rope has unit damage, the monitored amount calculation current vector of available formula (3) expressionC t i ); Calculate each time monitored amount calculation current vector and deduct monitored amount initial vector, the gained vector is exactly that the monitored quantitative changeization vector of (take the position of support cable that unit damage is arranged or numbering etc. as mark) is (when the under this conditioniWhen the root rope has unit damage, useδC i Represent monitored quantitative changeization vector, formula (4) is seen in definition, formula (4) deducts formula (1) gained for formula (3)), each element representation of monitored quantitative change vector supposition owing to calculating has the change amount of the corresponding monitored amount of this element that the unit damage of the Na Gensuo of unit damage causes; HaveNThe root rope just hasNIndividual monitored quantitative changeization vector is owing to haveNIndividual monitored amount is so each monitored quantitative change vector hasNIndividual element is by thisNIndividual monitored quantitative change vector forms successively to be hadN×NThe unit damage monitored quantitative change matrix of individual elementΔC，
ΔCDefinition as the formula (5).
Element in the formula (3)C tj i （
i =1, 2, 3, …….,
N； j=1, 2, 3, …….,
N) expression is because theiWhen the root rope has unit damage, according to coding rule correspondingjThe current amount of calculation of individual monitored amount.
(4)
In the formula (5)ΔC j,i (
i =1, 2, 3, …….,
N； j=1, 2, 3, …….,
N) expression is only because theiThe root rope have unit damage cause, according to coding rule correspondingjThe variation (algebraic value) of the calculating current value of individual monitored amount. Monitored quantitative changeization vectorδC i Be actually matrixΔCIn row, that is to say that formula (5) also can write an accepted way of doing sth (6).
3. monitored amount current value is vectorialC(calculating or actual measurement) is with monitored amount initial vectorC o , unit damage monitored quantitative change matrixΔC, the unit damage scalarD U With current damage vectordBetween linear approximate relationship, shown in (7) or formula (8). The current damage vector of cable systemdDefinition referring to formula (9).
In the formula (9)d i (
i =1, 2, 3, …….,
N) be in the cable systemiThe current damage of root rope (or pull bar);d i Be to represent not damaged at 0 o'clock, represent when being 100% that this rope thoroughly loses bearing capacity, represent to lose the bearing capacity of corresponding proportion in the time of between 0 and 100%.
When being 100%, rope damage represents that rope thoroughly loses bearing capacity if establish, when actual damage is not too large, (for example be not more than 30% damage) so, because the Cable Structure material still is in the linear elasticity stage, the distortion of Cable Structure is also less, and the represented a kind of like this linear relationship of formula (7) or formula (8) is less with the error of actual conditions. Linear relationship error vector with formula (10) definitioneThe error of linear relationship shown in expression (7) or the formula (8).
(10)
In the formula (10)abs()Is the absolute value function, the brackets of the vector obtained the absolute value of each element.
The second part of the present invention: Knowledge-based (including parameters) to be monitored and measured the amount of cable system health status assessment.
The formula (7) or (8) represented by a linear relationship exists some errors, it is not simply based on formula (7) or (8) and the actual amount of the current value being monitored vectorCTo get the current injury directly solve the vectord. If this is done, the resulting vector current injurydElements can appear even more negative, that is, negative damage, which is obviously unreasonable. So get the current injury vectordAcceptable solution (i.e. with reasonable error, but can be more accurately determined from the damaged cable retrieval system the location and degree of injury) as a reasonable solution, with Equation (11) to express this approach.
Formula (11)abs()Is to take the absolute value function, vectorgDescribes the deviation from the ideal linear relationship (formula (7) or (8)) a reasonable deviation from the formula (12) is defined.
Formula (12)g j (
j =1, 2, 3, …….,
N) Describes the deviation from the formula (7) or (8) is an ideal linear relationship between the maximum allowable deviation. VectorgAccording to equation (10) defines the error vectoreTrial selected.
The amount of the initial vector being monitoredC o , The unit amount of damage was monitored change matrixΔC, Measured by monitoring the amount of current value vectorCAnd unit damageD u (CalculatedΔCSet before, is a scalar) is known, you can use the appropriate algorithm (such as multi-objective optimization algorithm) for solving formula (11), to obtain the current injury vectordAcceptable solution in order to determine the location and damaged cord injury.
The third part of the present invention: health monitoring system software and hardware parts.
Hardware, including monitoring systems (including the monitoring of the amount of surveillance systems, cable structures bearing angular coordinates monitoring system), signal acquisition and computer. Require real-time or near real-time monitoring of the amount of each of which is monitored, require real-time or near real-time monitoring of each cable structure support angular coordinates.
Software should have the following features: First, the software part of the data from the monitoring system based on real-time or near real-time analysis to get the current cable structure measured bearing angle coordinate vectorU t , The amount of the current value of the monitored vectorCAnd then read the pre-stored mechanical cable structures calculated on the basis of model AoThe initial cable structures bearing angular coordinates vectorU oThe current benchmark model A mechanical calculationst oThe current cable structure bearing angular coordinate vectorU t o, The cable system units to monitor the amount of damage was change matrixΔC, The amount of the initial vector to be monitoredC o And unit damage valueD U To compare the measured current cable structure bearing angular coordinates vectorU t And the current cable structure bearing angular coordinate vectorU t oWhen theU t AndU t oThe same, according to the appropriate algorithm (such as multi-objective optimization algorithm) to solve the formula (11) to obtain the current cable system damage vectordNoninferior solution, that is, with reasonable errors, but can be more accurately determined from the cable system and the location of damaged cord injury solutions; whenU t AndU t oNot the same, the first calculated on the basis of the current mechanical Model At oAnd the current cable structure bearing angular coordinate vectorU t oTo be updated, and then in the new At oOn the basis of the foregoing, "cable structure units to create and update the amount of damage was monitored change matrixΔCApproach "UpdatingΔC, Also based on the appropriate algorithm (such as multi-objective optimization algorithm) for solving formula (11), to obtain cable system's current injury vectordNoninferior solution, that is, with reasonable errors, but can be more accurately determined from the cable system and the location of damaged cord injury solutions.
The method of the invention includes:
a. provided there are N roots Faso, first determine the number of cable rules, this rule will search all of the cable structure number, which will be used in subsequent steps to generate vectors and matrices;
b. structural data on the cable tensionNRoot supporting cable of the cable force to describe. For convenience, in the present invention, "the structure of the cable force data to be monitored," referred to as "the amount to be monitored." Later referred to "a certain amount to be monitored or certain vector matrix" is also read as "cable force XYZ XYZ matrix or vector."
c. direct measurement of all the cable structure calculated the amount of the initial value to be monitored, the amount of the initial vector components to be monitoredC o ; The actual amount to be monitored to get the initial vectorC o At the same time, all of the measured cable cable structures obtained initial cable force data, the initial geometric data structures, the initial coordinate data cable structures bearing support structure and the initial angular coordinates data cable, cable structures bearing the initial composition of the initial angular coordinate data cable structure bearing angular coordinate vectorU o；
d. According cable structure design drawings, as-built drawings and cable structures measured data cable for non-destructive testing and initial data cable structures bearing angular coordinate vectorU oEstablishing the initial mechanical cable structures calculated on the basis of model AoCable structures established for the first time calculated on the basis of current mechanical Model At o, Cable structures measured data cable structure includes at least the initial cable force all cable data cable structures bearing the initial coordinate data, the initial angular coordinates and cable structures bearing the initial geometry data cable structures; first time to establish the structure of the current cable A mechanical calculations baseline modelt oWhen the current mechanical cable structures calculated on the basis of model At oCable structure is equal to the initial baseline model A mechanical calculationso; Cable structure corresponds to the current benchmark model A mechanical calculationst oBearing angle of the cable structure composed of the current coordinate data cable structures bearing angular coordinate vectorU t o, The first to establish the current mechanical cable structures calculated on the basis of model At oWhenU t oIs equal toU o；
e. from here from the first step to step k e cycle; during service in the structure, and continuously measured angular coordinates to get cable structures bearing current data cable structures bearing angular coordinates of all current data structure composed of current index measured bearing angular coordinate vectorU t ；
f. measured according to the current cable structure bearing angular coordinates vectorU t When necessary to update the current benchmark model A mechanics calculationst oAnd the current cable structure bearing angular coordinate vectorU t o；
g. calculated on the basis of the current mechanics Model At oOn the basis of several mechanical calculations, cable structures obtained by calculating the amount of change in the monitored unit matrix damageΔCAnd unit damage scalarD u ；
h. measured cable structures obtained by monitoring the amount of all specified current measured value, the composition of the current value of the monitored quantity vectorC；
i. define the cable system's current injury vectord, The cable system is currently injury vectordNumber of elements equal to the number of cable, cable system is currently injury vectordElements and one to one relationship between cable, cable system is currently injury vectordValues represent the elements of the corresponding degree of injury or health claim status;
j. based on the current value of the monitored quantity vectorCThe same amount of the initial vector to be monitoredC o , Cable structure unit amount of damage was monitored change matrixΔC, Unit damage scalarD u And the unknown vector of the cable system's current injurydApproximately linear relationship exists between the approximate linear relationship can be expressed by formula 1, formula 1, in addition todOutside the other quantities are known, one can calculate the formula for solving the current system damage vectors cabled; Because of the current injury vectordValues represent the corresponding elements of the damage claim, so according to the current injury vectors determine what cable damage and injury, namely, the achievement of the cable structure retrieval system health monitoring; cord injury if the current value of the vector is an element 0, which means that the element corresponding to the cable is intact, no damage; if its value is 100%, it means that the element corresponding to the load capacity index has completely lost; if its value is between 0 and 100%, indicates that the corresponding proportion of the loss of cable carrying capacity;
Formula 1
k. return to step e, e began the first step to the next iteration step k.
In step f, measured according to the current cable structure bearing angular coordinate vectorU t When necessary to update the current benchmark model A mechanics calculationst oAnd the current cable structure bearing angular coordinate vectorU t oThe specific method is:
f1. measured in step e to get the current cable structure measured bearing angle coordinate vectorU t After comparisonU t And atU t o, IfU t EqualU t o, Then At oAndU t oRemain unchanged;
f2. measured in step e to get the current cable structure measured bearing angle coordinate vectorU t After comparisonU t AndU t o, IfU t Is not equal toU t o, You need the At oAndU t oUpdate, the method is: first calculateU t AndU oThe difference,U t AndU oThe difference is the initial position of cable structures bearing on the current bearing angular displacement, angular displacement vector with supportVIndicates bearing angular displacement, bearing angular displacement vectorVThe angular displacement component elements and bearing one relationship between, bearing angular displacement vectorVValue of an element in the bearing corresponds to a specified direction around a specified angular displacement; profile At oA method isoThe cable structure bearing bearing angular displacement constraints applied current, the current bearing angular displacement constraints on the values taken from the bearing angular displacement vectorVThe value in the corresponding element of the AoThe cable structure bearing bearing angular displacement constraints applied to be updated after the current benchmark model A mechanical calculationst oUpdate At oAt the same time,U t oAll values are also elements of step with the first eU t All elements of the value corresponds to the place, that is updatedU t o, Thus obtaining the right corresponds to the At oOfU t o。
In step g, calculated on the basis of the current mechanics Model At oBased on mechanical calculations obtained through several units of cable structures to monitor the amount of damage was change matrixΔCAnd unit damage scalarD u The specific method is:
g1. cord injury unit structure being monitored changes in the amount of matrixΔCIs constantly updated, which updates the current mechanical calculations in the baseline model At oAnd the current cable structure bearing angular coordinate vectorU t oAt the same time, you must also update the cable structure unit amount of damage was monitored change matrixΔCAnd unit damage scalarD u ；
g2. mechanics in cable structures calculated on the basis of the current Model At oOn the basis of several mechanical, calculated numerically equal to the number of the number of all indexes haveNRoot cable thereNOf calculations, every calculation assumes that only one cable system damage scalar units SuoD u , Damage occurs every time the calculation of the cable is different from other sub-calculations to injury of the cable, each cable structure in the calculated amount of current to be monitored all the calculated values, calculated each time the amount of all the monitored value of the current component calculation an amount calculated by monitoring the current vector;
g3. every time calculated by monitoring the amount calculated by subtracting the current vector obtained by monitoring the amount of the initial vector vector of a monitored volume changes; thereNRoot cable thereNA change in the monitored quantity vectors;
g4. by theseNA change in the amount to be monitored in turn composed of a vectorNColumns cable structure unit volume change matrix damage was monitoredΔC; Cable structure units to monitor the amount of damage was change matrixΔCEach column corresponds to an amount of change vectors to be monitored.
Beneficial effects:The method of the present invention appear in the cable structure bearing the case of angular displacement, the plurality of synchronizing damaged cable can be very accurately monitoring and evaluation of the cable system health status (including the location and all the damaged cord injury), the present invention discloses a system and method for the presence of angular displacement of the cable support effective health monitoring system is very useful.
Specific embodiments
In a bearing angular displacement, the structure of the cable against the cable system health monitoring, the present invention discloses a method is reasonable and effective monitoring of cable structures retrieval system health of each root cable system and method. Embodiments of the invention described below is merely exemplary in nature, and the aim is not to limit the application or use of the present invention.
The invention uses an algorithm, the algorithm for monitoring the cable structure of the cable system in health status. Specific implementation, the following steps are taken various steps in one.
The first step: Assume there are N roots Faso, first determine the number of cable rules, this rule will search all of the cable structure number, which will be used in subsequent steps to generate vectors and matrices. Data cable tension cable structures on theNRoot supporting cable of the cable force to describe. For convenience, in the present invention, "the structure of the cable force data to be monitored," referred to as "monitored amount" in the following referred to "to be monitored, or a certain quantity of a certain matrix vector", that read as "cable force XYZ XYZ matrix or vector. "
Step two: direct measurement of all the cable structure calculated the amount of the initial value to be monitored, the amount of the initial vector components to be monitoredC o ; The actual amount to be monitored to get the initial vectorC o At the same time, all of the measured cable cable structures obtained initial cable force data, the initial geometric data structures (for cable-stayed bridge is its initial data), the initial coordinate data cable structures bearing support structure and the initial angular coordinate data cable The initial angular coordinate data cable structures bearing structure composed of an initial claim bearing angular coordinates vectorU o。
The third step: According to the cable structure design drawings, as-built drawings and cable structures measured data (including structural initial geometry data, strain data, all the initial cable tension cable, structural modal data and other data on the cable-stayed bridge, suspension bridge the bridge is a bridge in terms of data, strain data, data cable force, the bridge modal data), non-destructive testing data cable, cable structures bearing the initial coordinate data and the initial vector of cable structures bearing angular coordinatesU oEstablishing the initial mechanical cable structures calculated on the basis of model AoCable structures established for the first time calculated on the basis of current mechanical Model At o; First created the current mechanical cable structures calculated on the basis of model At oWhen the current mechanical cable structures calculated on the basis of model At oCable structures with the initial baseline model A mechanical calculationsoThe same; cable structure corresponds to the current benchmark model A mechanical calculationst oBearing angle of the cable structure composed of the current coordinate data cable structures bearing angular coordinate vectorU t o; First created the current mechanical cable structures calculated on the basis of model At oWhenU t oIs equal toU o; Mechanical calculation based on the initial baseline model AoCalculated data structure calculation must be very close to actually measured data, the error is generally not more than 5%.
Step 4: In the structure during service, and continuously measured angular coordinates to get cable structures bearing current data cable structure currently consists of all data measured bearing angle coordinate vectorU t ；
Step Five: measured according to the current cable structure bearing angular coordinates vectorU t When necessary to update the current benchmark model A mechanics calculationst oAnd the current cable structure bearing angular coordinate vectorU t o. Obtained in the fourth step the measured current cable structure measured bearing angle coordinate vectorU t After comparisonU t AndU t o, IfU t EqualU t o, Then At oAndU t oRemain unchanged; ifU t Is not equal toU t o, You need the At oAndU t oUpdate, the method is: first calculateU t AndU oThe difference,U t AndU oThe difference is the initial position of cable structures bearing on the current bearing angular displacement, angular displacement vector with supportVIndicates bearing angular displacement, bearing angular displacement vectorVThe angular displacement component elements and bearing one relationship between, bearing angular displacement vectorVValue of an element in the bearing corresponds to a specified direction around a specified angular displacement; profile At oA method isoThe cable structure bearing bearing angular displacement constraints applied current, the current bearing angular displacement constraints on the values taken from the bearing angular displacement vectorVThe value in the corresponding element of the AoThe cable structure bearing bearing angular displacement constraints applied to be updated after the current benchmark model A mechanical calculationst oUpdate At oAt the same time,U t oAll elements of the fourth step of the value is also usedU t All elements of the value corresponds to the place, that is updatedU t o, Thus obtaining the right corresponds to the At oOfU t o。
Step Six: calculated on the basis of the current mechanics Model At oOn the basis of several mechanical calculations, cable structures obtained by calculating the amount of change in the monitored unit matrix damageΔCAnd unit damage scalarD u 。Specific methods are: cable structure unit amount of damage was monitored change matrixΔCIs constantly updated, which updates the current mechanical calculations in the baseline model At oAnd the current cable structure bearing angular coordinate vectorU t oAt the same time, you must also update the cable structure unit amount of damage was monitored change matrixΔCAnd unit damage scalarD u ; The current mechanical cable structures calculated on the basis of model At oOn the basis of several mechanical, calculated numerically equal to the number of the number of all indexes haveNRoot cable thereNOf calculations, every calculation assumes that only one cable system cable damage a unitD u (For example, take 5%, 10%, 20% or 30% damage and other damage as a unit), each time the calculation of the cable to injury of calculations is different from other damage of the cable occurs, is calculated each time all the monitored cable structure calculating the amount of the current value calculated each time the amount of all the monitored current calculated value of a monitored component calculating the current vectorC; Each time the amount calculated to be monitored to calculate the current vector by subtracting the amount of the initial vector to be monitored by monitoring the amount of change to get a vector; thereNRoot cable thereNA change in the monitored quantity vectors; by theseNA change in the amount to be monitored in turn composed of a vectorNColumn unit volume change matrix damage was monitoredΔC; Unit amount of damage was monitored changes in each column of the matrix corresponds to a change in the amount of vector to be monitored.
Step Seven: Create a linear relationship between the error vectoreAnd Vectorg. Using the previous data (the amount of the initial vector is monitoredC o , The unit amount of damage was monitored change matrixΔC), In the sixth step for each calculation at the same time, that is, in every calculation assumes that only one cable system cable damage a unitD u , Damage occurs every time the calculation of the cable is different from other sub-calculations of cable damage occurs, each time using mechanics calculations (eg using the finite element method) in the cable system, cable structures all the specified amount of current values to be monitored, each calculation form a current vector calculation to be monitoredCAt the same time, the formation of a damage each calculation vectordThe damage vectordAll elements of the value of only one element to takeD u , Other elements of value from 0, the damage vectordValues wereD u Element corresponding to the times when the only damage calculation unit cable damageD u ; TheC、C o 、
ΔC、
D u 、
dInto (10), to obtain a linear relationship between the error vectore, Each calculation error vector obtained a linear relationshipe; ThereNRoot cable thereNOf calculations, thereNA linear relationship between the error vectore, TheseNA linear relationship between the error vectoreObtained by adding a vector, each element of this vector is divided byNNew vector obtained is the final linear error vectore. VectorgEqual to the final error vectore。
Step eight: Install the cable structure health monitoring system hardware. Hardware components include at least: the monitored quantity monitoring system (for example, with an acceleration sensor, signal conditioning, etc.), cable structures bearing angular coordinates monitoring systems (including angle measurement sensors, signal conditioning, etc.), signal (data) collection, computer and communication alarm equipment. Each one is monitoring the amount of each cable structures bearing angular coordinates monitoring system must be monitored, the monitoring system will monitor the signal transmitted to the signal (data) acquisition; signal transmitted by the signal acquisition to the computer; computer then responsible for running the cable structure of the cable system health monitoring software, including recording signals transmitted to the signal acquisition; when there is damage to monitor the cable, the computer controls the communication device to the alarm monitoring staff, owners and (or) persons designated by the police.
...
Step eight: Install the cable structure health monitoring system hardware. Hardware components include at least: the monitored quantity monitoring system (for example, with an acceleration sensor, signal conditioning, etc.), cable structures bearing angular coordinates monitoring systems (including angle measurement sensors, signal conditioning, etc.), signal (data) collection, computer and communication alarm equipment. Each one is monitoring the amount of each cable structures bearing angular coordinates monitoring system must be monitored, the monitoring system will monitor the signal transmitted to the signal (data) acquisition; signal transmitted by the signal acquisition to the computer; computer then responsible for running the cable structure of the cable system health monitoring software, including recording signals transmitted to the signal acquisition; when there is damage to monitor the cable, the computer controls the communication device to the alarm monitoring staff, owners and (or) persons designated by the police.
...C o , The unit amount of damage was monitored change matrixΔC, Unit damage scalarD u Parameter data files saved in the way health monitoring system software running computer's hard drive.
Step 10: prepared and installed on your computer when you run the bearing angular displacement of the cable-based cable force monitoring system health monitoring methods system software, the software will complete the present invention, "bearing angular displacement of the cable-based cable force monitoring system health monitoring methods "tasks require monitoring, recording, control, storage, computing, notification, alarm and other functions (ie, the specific implementation methods can use a computer to complete all the work)
Step 11: Measured get all the cable structure specifies the amount of current measured value monitoring, form the "amount of the current value of the monitored vectorC”；
Step 12: according to the current value of the monitored quantity vectorCThe same amount of the initial vector to be monitoredC o , The unit amount of damage was monitored change matrixΔC, Unit damage scalarD u And the cable system is currently injury vectord(By the amount of damage all cable current composition) the approximate linear relationship exists between the (formula (7)), in accordance with the multi-objective optimization algorithm to calculate the cable system's current injury vectordNoninferior solution, that is, with reasonable errors, but can be more accurately determined from all the cable damaged cord injury in the location and extent of the solution.
Can be used for multi-objective optimization algorithm there are many, for example: based on genetic algorithm for multi-objective optimization, based on artificial neural networks for multi-objective optimization, based on multi-objective particle swarm optimization algorithm based on ant colony algorithm for multi-objective optimization, constraint method (Constrain Method), weighted method (Weighted SUm Method), goal programming (Goal Attainment Method) and so on. Since a variety of multi-objective optimization algorithm are conventional algorithms can be easily implemented, the implementation steps are given as an example only goal programming method for solving the current injury vectordProcess, other algorithms specific implementation process according to the specific requirements of the algorithm in a similar manner.
In accordance with the goal programming method, formula (7) can be converted into formula (13) and the formula (14) shown in the multi-objective optimization problem, formula (13) in theγIs a real number,RIs the real number field, limiting the vector space region ΩdEach element of the range (in this embodiment requires vectordEach element of not less than 0 and not more than 1). Formula (13) is to find a minimum mean real numberγ, Such that formula (14) is met. Formula (14)G(d)By the formula (15) defined in the formula (14) the weighting vectorWAndγRepresents the product of formula (14)G(d)And VectorgBetween permissible deviationgSee the definition of formula (12), the value calculated in the seventh step. Vector actual calculationWWith vectorgSame. Goal Programming specific programming has common procedures can be directly used. Using Goal Programming cable system can be obtained vector current injuryd。
Cable system is currently injury vectordNumber of elements equal to the number of cable, cable system is currently injury vectordElements and one to one relationship between cable, cable system is currently injury vectordValues represent the elements of the corresponding degree of injury or health claim status. If the solution obtained cord injury vector current systemdThe value of an element is 0, which means that the element corresponding to the cable is intact, no damage; if its value is 100%, it means that the element corresponding to the load capacity index has completely lost; if its value is between between 0 and 100%, it means the loss of the corresponding proportion of cable carrying capacity.
Step 13: health monitoring systems or computer personnel to operate regular automatic health monitoring system generates retrieval system health report.
Step Fourteen: under specified conditions, health monitoring system, automatic operation of a computer device to communicate alarm monitoring staff, owners and (or) persons designated by the police.
Step 15: Go back to the fourth step, the fourth step from the beginning to the 15th step of the cycle.
Claims (3)
- A method for bearing angular displacement of the cable based on the cable tension monitoring health monitoring system, characterized in that said method comprises:a. provided there are N roots Faso, first determine the number of cable rules, this rule will search all of the cable structure number, which will be used in subsequent steps to generate vectors and matrices;b. structural data on the cable tensionNRoot supporting cable of the cable force to describe; For convenience, in the present invention, the "structure of the data to be monitored cable force" referred to as "the amount to be monitored"; later referred to "a certain amount to be monitored in a matrix or a vector ", they read as" cable force XYZ XYZ matrix or vector. "c. direct measurement of all the cable structure calculated the amount of the initial value to be monitored, the amount of the initial vector components to be monitoredC o ; The actual amount to be monitored to get the initial vectorC o At the same time, all of the measured cable cable structures obtained initial cable force data, the initial geometric data structures, the initial coordinate data cable structures bearing support structure and the initial angular coordinates data cable, cable structures bearing the initial composition of the initial angular coordinate data cable structure bearing angular coordinate vectorU o；d. According cable structure design drawings, as-built drawings and measured data cable structures, non-destructive testing data cable, cable structures bearing the initial coordinate data and the initial vector of cable structures bearing angular coordinatesU oEstablishing the initial mechanical cable structures calculated on the basis of model Ao, And for the first time to establish the current mechanical cable structures calculated on the basis of model At o, Cable structures measured data structure including at least all the cable cable cable force the initial data, the initial coordinate data cable structures bearing, bearing the initial angular coordinate data cable structure and the structure of the initial geometry data cable; cable structure is first created A mechanical model of the current basis of calculationt oWhen the current mechanical cable structures calculated on the basis of model At oCable structure is equal to the initial baseline model A mechanical calculationso; Cable structure corresponds to the current benchmark model A mechanical calculationst oBearing angle of the cable structure composed of the current coordinate data cable structures bearing angular coordinate vectorU t o, The first to establish the current mechanical cable structures calculated on the basis of model At oWhenU t oIs equal toU o；e. from here from the first step to step k e cycle; during service in the structure, and continuously measured angular coordinates to get cable structures bearing current data cable structures bearing angular coordinates of all current data structure composed of current index measured bearing angular coordinate vectorU t ；f. measured according to the current cable structure bearing angular coordinates vectorU t When necessary to update the current benchmark model A mechanics calculationst oAnd the current cable structure bearing angular coordinate vectorU t o；g. calculated on the basis of the current mechanics Model At oOn the basis of several mechanical calculations, cable structures obtained by calculating the amount of change in the monitored unit matrix damageΔCAnd unit damage scalarD u ；h. measured cable structures obtained by monitoring the amount of all specified current measured value, the amount of current being monitored componentsNumeric vectorC；i. define the cable system's current injury vectord, The cable system is currently injury vectordNumber of elements equal to the number of cable, cable system is currently injury vectordElements and one to one relationship between cable, cable system is currently injury vectordValues represent the elements of the corresponding degree of injury or health claim status;j. based on the current value of the monitored quantity vectorCThe same amount of the initial vector to be monitoredC o , Cable structure unit amount of damage was monitored change matrixΔC, Unit damage scalarD u And the unknown vector of the cable system's current injurydApproximately linear relationship exists between the approximate linear relationship can be expressed by formula 1, formula 1, in addition todOutside the other quantities are known, one can calculate the formula for solving the current system damage vectors cabled; Because of the current injury vectordValues represent the corresponding elements of the damage claim, so according to the current injury vectors determine what cable damage and injury, namely, the achievement of the cable structure retrieval system health monitoring; cord injury if the current value of the vector is an element 0, which means that the element corresponding to the cable is intact, no damage; if its value is 100%, it means that the element corresponding to the load capacity index has completely lost; if its value is between 0 and 100%, indicates that the corresponding proportion of the loss of cable carrying capacity;Formula 1
k. return to step e, e began the first step to the next iteration step k. - (2) as claimed in claim 1, wherein the seat angular displacement of the cable based on the cable tension monitoring health monitoring system, characterized in that in step f, the current measured bearing angle cable structure coordinate vectorU t When necessary to update the current benchmark model A mechanics calculationst oAnd the current cable structure bearing angular coordinate vectorU t oThe specific method is:f1. measured in step e to get the current cable structure measured bearing angle coordinate vectorU t After comparisonU t And atU t o, IfU t EqualU t o, Then At oAndU t oRemain unchanged;f2. measured in step e to get the current cable structure measured bearing angle coordinate vectorU t After comparisonU t AndU t o, IfU t Is not equal toU t o, You need the At oAndU t oUpdate, the method is: first calculateU t AndU oThe difference,U t AndU oThe difference is the initial position of cable structures bearing on the current bearing angular displacement, angular displacement vector with supportVIndicates bearing angular displacement, bearing angular displacement vectorVThe angular displacement component elements and bearing one relationship between, bearing angular displacement vectorVValue of an element in the bearing corresponds to a specified direction around a specified angular displacement; profile At oA method isoThe cable structure bearing bearing angular displacement constraints applied current, the current bearing angular displacement constraints on the values taken from the bearing angular displacement vectorVThe value in the corresponding element of the AoThe cable structure bearing bearing angular displacement constraints applied to be updated after the current benchmark model A mechanical calculationst oUpdate At oAt the same time,U t oAll values are also elements of step with the first eU t All elements of the value corresponds to the place, that is updatedU t o, Thus obtaining the right corresponds to the At oOfU t o。
- 3 according to claim 1, wherein the seat angular displacement of the cable based on the cable tension monitoring health monitoring system, characterized in that in step g, calculated on the basis of the current model of the mechanical At oBased on mechanical calculations obtained through several units of cable structures to monitor the amount of damage was change matrixΔCAnd unit damage scalarD u The specific method is:g1. cord injury unit structure being monitored changes in the amount of matrixΔCIs constantly updated, which updates the current mechanical calculations in the baseline model At oAnd the current cable structure bearing angular coordinate vectorU t oAt the same time, you must also update the cable structure unit amount of damage was monitored change matrixΔCAnd unit damage scalarD u ；g2. mechanics in cable structures calculated on the basis of the current Model At oOn the basis of several mechanical, calculated numerically equal to the number of the number of all indexes haveNRoot cable thereNOf calculations, every calculation assumes that only one cable system damage scalar units SuoD u , Damage occurs every time the calculation of the cable is different from other sub-calculations to injury of the cable, each cable structure in the calculated amount of current to be monitored all the calculated values, calculated each time the amount of all the monitored value of the current component calculation an amount calculated by monitoring the current vector;g3. every time calculated by monitoring the amount calculated by subtracting the current vector obtained by monitoring the amount of the initial vector vector of a monitored volume changes; thereNRoot cable thereNA change in the monitored quantity vectors;g4. by theseNA change in the amount to be monitored in turn composed of a vectorNColumns cable structure unit volume change matrix damage was monitoredΔC; Cable structure units to monitor the amount of damage was change matrixΔCEach column corresponds to an amount of change vectors to be monitored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101226497A CN102288435A (en) | 2011-05-13 | 2011-05-13 | Health monitoring method of cable system based on cable force monitoring during angular displacement of support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101226497A CN102288435A (en) | 2011-05-13 | 2011-05-13 | Health monitoring method of cable system based on cable force monitoring during angular displacement of support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102288435A true CN102288435A (en) | 2011-12-21 |
Family
ID=45335035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101226497A Pending CN102288435A (en) | 2011-05-13 | 2011-05-13 | Health monitoring method of cable system based on cable force monitoring during angular displacement of support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102288435A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706582A (en) * | 2012-05-29 | 2012-10-03 | 东南大学 | Damaged cable approximant identification method on basis of hybrid monitoring during temperature variation |
| CN102735470A (en) * | 2012-05-30 | 2012-10-17 | 东南大学 | Damaged cable identification method based on cable force monitoring of support angular displacement and temperature change |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998057166A1 (en) * | 1997-06-11 | 1998-12-17 | Pure Technologies Ltd. | Method and apparatus for monitoring of tensioned cables |
| CN101319962A (en) * | 2008-07-08 | 2008-12-10 | 东南大学 | Health monitoring method for cable system in cable structure |
| CN101334338A (en) * | 2008-07-29 | 2008-12-31 | 东南大学 | Cable structure cable system healthy monitoring method based on space coordinates monitoring |
| CN101793620A (en) * | 2010-03-17 | 2010-08-04 | 东南大学 | Health monitoring method of cable system based on cable force monitoring during support settlement |
-
2011
- 2011-05-13 CN CN2011101226497A patent/CN102288435A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998057166A1 (en) * | 1997-06-11 | 1998-12-17 | Pure Technologies Ltd. | Method and apparatus for monitoring of tensioned cables |
| CN101319962A (en) * | 2008-07-08 | 2008-12-10 | 东南大学 | Health monitoring method for cable system in cable structure |
| CN101334338A (en) * | 2008-07-29 | 2008-12-31 | 东南大学 | Cable structure cable system healthy monitoring method based on space coordinates monitoring |
| CN101793620A (en) * | 2010-03-17 | 2010-08-04 | 东南大学 | Health monitoring method of cable system based on cable force monitoring during support settlement |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706582A (en) * | 2012-05-29 | 2012-10-03 | 东南大学 | Damaged cable approximant identification method on basis of hybrid monitoring during temperature variation |
| CN102735470A (en) * | 2012-05-30 | 2012-10-17 | 东南大学 | Damaged cable identification method based on cable force monitoring of support angular displacement and temperature change |
| CN102735470B (en) * | 2012-05-30 | 2015-09-30 | 东南大学 | Based on the damaged cable recognition methods of cable force monitoring during angular displacement of support temperature variation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101782472B (en) | Health monitoring method of rope system based on angle monitoring during support settlement | |
| CN102297767A (en) | Health monitoring method of rope system based on angle monitoring when support displaces angularly | |
| CN101788402B (en) | Method for indentifying loose supporting cable based on angle monitoring during support settlement | |
| CN102297766A (en) | Progressive method for identifying damaged rope and angular displacement of support based on strain monitoring | |
| CN101788401B (en) | Method for indentifying loose supporting cable based on strain monitoring during support settlement | |
| CN102288431A (en) | Health monitoring method of cable system based on strain monitoring in angular displacement of supporting seat | |
| CN101793620B (en) | Health monitoring method of cable system based on cable force monitoring during support settlement | |
| CN102323078A (en) | Cable force monitoring based damaged cable recognizing method applied in supporting seat generalized displacement | |
| CN102297774A (en) | Health monitoring method for cable system based on hybrid monitoring during supporting-base angular displacement | |
| CN102323080A (en) | The health monitor method of the cable system of bearing generalized displacement time space coordinate monitoring | |
| CN102323082A (en) | Health monitoring method of cable system based on strain monitoring during support generalized displacement | |
| CN102288423B (en) | Progressive method for recognizing damaged cable and angular displacement of support based on angle monitoring | |
| CN101793622B (en) | Method for distinguishing slack supporting cable based on cable force monitoring during support settlement | |
| CN102323079B (en) | Angle monitoring based cable system health monitoring method applied in supporting seat generalized displacement | |
| CN102288428A (en) | Method for distinguishing slack cable based on hybrid monitoring in angular displacement of supporting seat | |
| CN102288435A (en) | Health monitoring method of cable system based on cable force monitoring during angular displacement of support | |
| CN102323092A (en) | Cable monitoring based loose cable monitoring method applied in supporting seat generalized displacement | |
| CN101788399B (en) | Health monitoring method of cable system based on strain monitoring during support settlement | |
| CN102288436A (en) | Method for identifying slack supporting cables based on space coordinate monitoring during angular displacement of support | |
| CN102221481A (en) | Relax cable identification method based on mixed monitoring in support generalized displacement | |
| CN101789054A (en) | Health monitoring method of cable system based on space coordinate monitoring during support settlement | |
| CN102297775A (en) | Progressive method for identifying loose cables based on cable stress monitoring during supporting-base angular displacement | |
| CN102288427A (en) | Progressive health monitoring method of cable system based on strain monitoring in angular displacement of supporting seat | |
| CN102288430A (en) | Progressive method for recognizing slack cable based on hybrid monitoring during angular displacement of support | |
| CN102297771A (en) | Progressive health monitoring method for cable system based on angle monitoring during supporting-base angular displacement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20111221 |