CN101699248B - Progressive health monitoring method for identifying loose carrying cable based on angle monitoring - Google Patents

Abstract

The invention discloses a progressive health monitoring method for identifying loose carrying cable based on angle monitoring, which takes the fact that the linear relationships between a current value vector of a monitored volume and an initial value vector of the monitored volume, between monitored value change matrix of virtual unit damage and a current nominal virtual damage vector are approximate into consideration in the loose carrying cable identification. Based on angle monitoring, the invention provides a method for approaching a nonlinear relationship piecewise by using the linear relationships that: a large interval is segmented into continuous small intervals one by one; the linear relationships in each interval are accurate enough; appropriate algorithms, such as a multi-objective optimization algorithm and the like, can be used for computing noninferior solution of the current cable virtual damage vector in each interval so as to identify virtual damaged cables; and the residual virtual damaged cables are the loose carrying cables after a true damaged cable is identified by the methods, such as a nondestructive detection method and the like, from the virtual damaged cables, so the cable length to be adjusted can be determined according to the relationship between looseness degree and virtual damage degree.

Description

Progressive health monitoring method based on the lax support cable of the identification of angle monitor

Technical field

The present invention is based on the monitoring of angle equivalent, a kind of identification Cable Structure (particularly large-scale Cable Structure is disclosed, for example large-scale cable-stayed bridge, suspension bridge) cable system (referring to all ropeway carrying-ropes) in need adjust the support cable of Suo Li, and provide the long adjustment amount of concrete rope, genus engineering structure security fields.

Background technology

Cable system is Cable Structure (particularly large-scale Cable Structure normally; for example large-scale cable-stayed bridge, suspension bridge) key components; owing to reason such as lax; new construction is completed, and the Suo Li of support cable can change usually after a period of time; the lax variation that also can cause the supporting cable force of its support cable behind the structure long service; these change the variation that all will cause structural internal force; safety to structure causes harmful effect; will cause the inefficacy of structure when serious, therefore accurately and timely discern the support cable that needs to adjust Suo Li and be very important.

The health status of support cable system changes and (for example takes place lax, damage etc.) after, except meeting causes the variation of Suo Li, also can cause the variation of other measurable parameter of structure, for example caused variation (for example arbitrarily variation of the angle coordinate of the straight line of any this point of mistake in any section of body structure surface of angle coordinate of any imaginary line of the every bit of Cable Structure, the perhaps body structure surface variation of the angle coordinate of the normal of any arbitrarily), therefore can discern the rope that needs to adjust Suo Li based on angle monitor, a method of can rational and effective setting up the relation of (specifically the characteristic parameter according to rope characterizes the rope that needs to adjust Suo Li) between the characteristic parameter of monitored amount with all ropes so just must be arranged, and the need of setting up based on this method are adjusted the recognition result of the support cable of Suo Li just can be more credible.

Summary of the invention

Technical matters: the purpose of this invention is to provide a kind of progressive health monitoring method based on the lax support cable of the identification of angle monitor, health monitoring problem at cable system in the Cable Structure, monitor by angle equivalent, disclose a kind of laddering ground, can discern the structure health monitoring method that to adjust the support cable of Suo Li rationally and effectively Cable Structure.

Reason according to the Suo Li of support cable changes can change the two kinds of situations that be divided into the Suo Li of support cable: the one, and support cable has been subjected to damage, and for example localized cracks and corrosion or the like have appearred in support cable; The 2nd, support cable and not damaged, but variation has also taken place in Suo Li, the one of the main reasons that this variation occurs is that variation has taken place the Suo Changdu (be called drift, the present invention specially refers to the drift of that section rope between support cable two supporting end points) under the support cable free state (this moment, Suo Zhangli claimed that also Suo Li is 0).One of fundamental purpose of the present invention will identify drift exactly the support cable that changes has taken place, and identifies the change amount of their drift, and this change amount provides direct foundation for the Suo Li adjustment of this rope.The reason that the support cable drift changes is not single, and for convenience, the present invention is referred to as slack line with the support cable that drift changes.

Technical scheme: the present invention is made up of three parts.Be respectively the method for setting up required knowledge base of the health monitoring systems be used for discerning support cable cable system, that need to adjust Suo Li and parameter, based on knowledge base (containing parameter), based on the software and hardware part of the structural healthy monitoring system of the support cable that need monitoring, the identification Cable Structure of angle equivalent are adjusted the method for the support cable of Suo Li, the need that are used to discern cable system are adjusted Suo Li.

First of the present invention: set up the required knowledge base of the health monitoring systems be used for discerning support cable cable system, that need to adjust Suo Li and the method for parameter, and the method that need adjust the support cable of Suo Li based on the identification of knowledge base (containing parameter) and real measured data.Can be successively circularly as follows, laddering carrying out, to obtain the health status assessment of cable system more accurately.

The first step: during circulation beginning each time, the initial virtual lesion vector of the cable system d when at first needing to set up or set up this circulation beginning _o ⁱ(i=1,2,3 ...Because in fact support cable may be lax and not damage is the expression difference, claim here " virtual lesion ", the back with) and the Mechanics Calculation benchmark model A of structure ⁱ(finite element benchmark model for example, i=1,2,3 ...), subscript i represents the i time circulation.

" initial virtual lesion vector is designated as d to the cable system that needs during the i time circulation beginning _o ⁱ" (as the formula (1)), use d _o ⁱCable Structure when representing this time circulation beginning is (with Mechanics Calculation benchmark model A ⁱThe health status of cable system expression).

$d_o^i={\left[\begin{array}{cccccc}{d}_{o1}^i& d_{o2}^i& \·\·\·& d_{\mathrm{oj}}^i& \·\·\·& d_{\mathrm{oN}}^i\end{array}\right]}^T---\left(1\right)$

D in the formula (1) ⁱ _Oj(i=1,2,3, J=1,2,3 ...., when N) the i time circulation of expression begins, Mechanics Calculation benchmark model A ⁱIn the initial virtual lesion value of j root rope of cable system, d ⁱ _OjBeing that to represent that j root rope not damaged did not have at 0 o'clock lax, is to represent that this rope thoroughly lost load-bearing capacity at 100% o'clock, represents the load-bearing capacity of j root rope forfeiture corresponding proportion in the time of between 0 and 100%.T represents the transposition (back together) of vector in the formula (1).

If total N root rope in the cable system is set up the initial virtual lesion vector of cable system during circulation beginning for the first time and (is designated as d according to formula (1) ¹ _o) time, the data of utilizing the Non-Destructive Testing data etc. of rope can express the health status of rope are set up the initial virtual lesion vector of cable system d ¹ _oIf when not having the data of the Non-Destructive Testing data of rope and other health status that can express rope, can think that perhaps the structure original state is a not damaged when not having relaxed state, vectorial d ¹ _oEach element numerical value get 0.

The i time (i=2,3,4,5,6 ...) the initial virtual lesion vector of the cable system of needs d when circulation begins ⁱ _o, be preceding once (promptly the i-1 time, i=2,3,4,5,6 ...) the preceding calculating acquisition of loop ends, concrete grammar is described below.

The Mechanics Calculation benchmark model that need set up during the i time circulation beginning or the Mechanics Calculation benchmark model of having set up are designated as A ⁱ

The Mechanics Calculation benchmark model of the Cable Structure of setting up during circulation beginning for the first time is designated as A ¹, A ¹It is design drawing according to Cable Structure, the measured data of as-constructed drawing and Cable Structure (generally comprises the rope force data, the structure angle-data, shape data, spatial data, strain data, measured datas such as structural modal data, to cable-stayed bridge, suspension bridge and the rope force data of Yan Shiqiao, the bridge type data, strain data, angle-data, measured datas such as the modal data of bridge) etc. the data of original state when the reflection Cable Structure is built up, or the data of reflection Cable Structure current state when health monitoring systems is installed, utilize mechanics method (for example finite element method) to set up the Mechanics Calculation benchmark model of this structure (for example finite element benchmark model), the Structure Calculation data that calculate based on this calculating benchmark model are (to cable-stayed bridge, suspension bridge and the rope force data of Yan Shiqiao, the bridge type data, strain data, measured datas such as angle-data) must be very near its measured data, error generally must not be greater than 5%.Can guarantee like this to calculate the measured data of data (for example rope force data, strain data, angle-data, planform computational data and spatial coordinates calculation data etc.) when truly taking place near analog case reliably under the analog case of calculating gained on the benchmark model at this.

The i time (i=2,3,4,5,6 ...) the Mechanics Calculation benchmark model A of needs when circulation begins ⁱ, be preceding once (promptly the i-1 time, i=2,3,4,5,6 ...) the preceding calculating acquisition of loop ends, concrete grammar is described below.

Existing Mechanics Calculation benchmark model A ¹With the initial virtual lesion vector of cable system d ¹ _oAfter, model A ¹In the virtual lesion of each rope by vectorial d ¹ _oExpress.At A ¹The basis on, the virtual lesion value of all ropes is changed to 0, mechanical model A ¹The virtual lesion that is updated to all ropes all is that 0 mechanical model (is designated as A ⁰), mechanical model A ⁰Be actually the excellent mechanical model that does not have lax Cable Structure correspondence.Might as well claim model A ⁰For the not damaged of Cable Structure does not have relaxation model A ⁰

" the whole monitored angle-data of structure " described by H angle coordinate component L the appointment straight line specified point of K on the structure, that cross each specified point, each appointment straight line, and the variation of structure angle is exactly the variation of the angle coordinate component of all appointments all specified points, all appointment straight lines.(individual angle coordinate component measurement value of M=K * L * H) or calculated value characterize the angle information of structure to each total M.K and M must not be less than the quantity N of support cable.For simplicity, in the present invention " the monitored angle-data of structure " abbreviated as " monitored amount ".

The present invention " initial value vector C of monitored amount ⁱ _o" (i=1,2,3 ...) initial value (referring to formula (2)) of the monitored amount of all appointments when the i time (i=1,2,3,4,5,6 ...) circulation of expression begins, C ⁱ _oFull name be the initial value vector of monitored amount " the i time circulation ".

$C_o^i={\left[\begin{array}{cccccc}{C}_{o1}^i& C_{o2}^i& \·\·\·& C_{\mathrm{ok}}^i& \·\·\·& C_{\mathrm{oM}}^i\end{array}\right]}^T---\left(2\right)$

C in the formula (2) ⁱ _Ok(i=1,2,3, K=1,2,3 ...., M; M 〉=N; ) k monitored amount when being the i time circulation beginning, in the Cable Structure.Vector C ⁱ _oBe to be formed according to certain series arrangement by the monitored amount of previously defined M, this is put in order there is no specific (special) requirements, only require all associated vector of back also in this order array data get final product.

During circulation beginning for the first time, " the initial value vector C of the 1st the monitored amount that circulates ¹ _o" (seeing formula (2)) be made up of measured data, because according to model A ¹The initial value of calculating the monitored amount of gained approaches corresponding measured value reliably, in the narration of back, will represent this calculated value composition of vector and measured value composition of vector with prosign.

The i time (i=2,3,4,5,6 ...) when beginning circulation " the vectorial C of the initial value of the i time monitored amount of circulation that needs ⁱ _o", be preceding once (promptly the i-1 time, i=2,3,4,5,6 ...) calculate before the loop ends and to obtain, concrete grammar is described below.

Second step: circulation each time needs to set up " the monitored numerical quantity transformation matrices of virtual unit damage ", and " the monitored numerical quantity transformation matrices of virtual unit damage " that the i time circulation set up is designated as Δ C ⁱ(i=1,2,3 ...).

The Cable Structure " the monitored numerical quantity transformation matrices of virtual unit damage " that circulation is for the first time set up is designated as Δ C ¹Set up Δ C ¹Process as follows:

Mechanics Calculation benchmark model A in Cable Structure ¹The basis on carry out several times and calculate, equal the quantity of all ropes on the calculation times numerical value.(original virtual lesion can be 0, can not be 0 also, concrete numerical value and vectorial d at original virtual lesion to have only a rope in the cable system of calculating hypothesis each time ¹ _oThe numerical value of corresponding element identical) the basis on increase virtual unit damage (unit damage should be less, and for example getting 5%, 10%, 20% or 30% equivalent damage is virtual unit damage) again.Calculate for convenient, when setting virtual unit damage in the circulation each time can all be structural health conditions during this time circulation beginning as being healthy fully, and (the damage numerical value of the rope that calculates in subsequent step is called as nominal virtual lesion d to set virtual unit damage on this basis ⁱ _c(i=1,2,3 ...), all with respect to this time when beginning circulation, with the health status of rope as being healthy fully speech, the nominal virtual lesion value that the formula that therefore must foundation hereinafter provides will calculate be converted into the actual and virtual impairment value).The rope that occurs virtual lesion during a round-robin calculates each time together is different from the rope that occurs virtual lesion in other time calculating, and supposition each time has the virtual unit damage value of the rope of virtual lesion can be different from the virtual unit damage value of other ropes, uses " nominal virtual unit damage vector D ⁱ _u" (as the formula (3)) write down the virtual unit damage of the supposition of all ropes in each time circulation, circulation time is designated as D for the first time ¹ _uCalculate each time all utilize mechanics method (for example finite element method) calculate Cable Structure, the current calculated value of the M of appointment monitored amount in front, the current calculated value that calculates gained M monitored amount is each time formed one " the current numerical value vector of the calculating of monitored amount ", and (when hypothesis j root rope had unit damage, available formula (4) was represented the current numerical value vector of the calculating C of M monitored amount of all appointments ¹ _Tj); " the current numerical value vector of the calculating of the monitored amount C that calculates each time ¹ _Tj" deduct " initial value of monitored amount vector C ¹ _o", the gained vector is exactly that " the numerical value change vector of monitored amount " of (is mark with the position of rope that virtual unit damage is arranged or numbering etc.) (when j root rope has unit damage, used δ C under this condition ¹ _jExpression " the numerical value change vector of monitored amount ", δ C ¹ _jDefinition see formula (5), formula (6) and formula (7), formula (5) deducts after the formula (2) again divided by vectorial D for formula (4) ¹ _uJ element D _UjGained), the numerical value change of monitored amount vector δ C ¹ _jEach element representation since when calculating supposition the virtual unit damage (D for example of the Na Gensuo (for example j root rope) of virtual unit damage is arranged _Uj), and the numerical value change amount of the pairing monitored amount of this element that causes is with respect to the virtual unit damage D of supposition _UjRate of change; There is N root rope that N " the numerical value change vector of monitored amount " just arranged, the numerical value change vector of each monitored amount has M (general, the individual element of M 〉=N) is formed " the monitored numerical quantity transformation matrices of the virtual unit damage Δ C that M * N element arranged successively by this N " the numerical value change vector of monitored amount " ¹" (the capable N row of M), each vectorial δ C ¹ _j(j=1,2,3 ...., N) be matrix Δ C ¹One row, Δ C ¹Definition as the formula (8).

$D_u^i={\left[\begin{array}{cccccc}{D}_{u1}^i& D_{u2}^i& \·\·\·& D_{\mathrm{uj}}^i& \·\·\·& D_{\mathrm{uN}}^i\end{array}\right]}^T---\left(3\right)$

Nominal virtual unit damage vector D in the formula (3) ⁱ _uElement D ⁱ _Uj(i=1,2,3, J=1,2,3 ...., N) the virtual unit damage numerical value of the j root rope of supposition in the i time circulation of expression, vectorial D ⁱ _uIn the numerical value of each element can be the same or different.

$C_{\mathrm{tj}}^i={\left[\begin{array}{cccccc}{C}_{\mathrm{tj}1}^i& C_{\mathrm{tj}2}^i& \·\·\·& C_{\mathrm{tjk}}^i& \·\·\·& C_{\mathrm{tjM}}^i\end{array}\right]}^T---\left(4\right)$

Elements C in the formula (4) ⁱ _Tjk(i=1,2,3 ...; J=1,2,3 ...., N; K=1,2,3 ...., M; The i time circulation of the expression of M 〉=N) be owing to j root rope has during nominal virtual unit damage, according to the current numerical value of calculating of the monitored amount of pairing k the appointment of coding rule.

$\mathrm{\δ}{C}_j^i=\frac{C_{\mathrm{tj}}^i-C_o^i}{D_{\mathrm{uj}}^i}---\left(5\right)$

The subscript i of each amount in the formula (5) (i=1,2,3 ...) the i time circulation of expression, subscript j (j=1,2,3 ...., N) expression j root rope has nominal virtual unit damage, D in the formula ⁱ _UjBe vectorial D ⁱ _uIn j element.Vector δ C ⁱ _jDefinition as the formula (6), δ C ⁱ _jK (k=1,2,3 ...., M; The individual element δ C of M 〉=N) ⁱ _JkRepresent to set up matrix Δ C in the i time circulation ⁱThe time, suppose the change amount of calculating a gained k monitored amount when j root rope has nominal virtual unit damage nominal virtual unit damage D with respect to supposition ⁱ _UjRate of change, it defines as the formula (7).

$\mathrm{\δ}{C}_j^i={\left[\begin{array}{cccccc}\mathrm{\δ}{C}_{j1}^i& {\mathrm{\δC}}_{j2}^i& \·\·\·& \mathrm{\δ}{C}_{\mathrm{jk}}^i& \·\·\·& \mathrm{\δ}{C}_{\mathrm{jM}}^i\end{array}\right]}^T---\left(6\right)$

$\mathrm{\δ}{C}_{\mathrm{jk}}^i=\frac{C_{\mathrm{tjk}}^i-C_{\mathrm{ok}}^i}{D_{\mathrm{uj}}^i}---\left(7\right)$

The definition of each amount has been previously described in the formula (7).

$\mathrm{\Δ}{C}^i=\left[\begin{array}{cccccc}\mathrm{\δ}{C}_1^i& \mathrm{\δ}{C}_2^i& \·\·\·& \mathrm{\δ}{C}_j^i& \·\·\·& \mathrm{\δ}{C}_N^i\end{array}\right]---\left(8\right)$

Vectorial δ C in the formula (8) ⁱ _j(i=1,2,3 ....,, j=1,2,3 ...., N) in the i time circulation of expression, because j root rope has nominal virtual unit damage D ⁱ _UjCause, the relative value of all monitored amounts changes.Matrix Δ C ⁱThe coding rule of row (subscript j) and front vector d ⁱ _oThe coding rule of subscript j of element identical.

The 3rd step: the current health status of identification cable system.Detailed process is as follows.

I (i=1,2,3 ...) in the inferior circulation, cable system " current (calculating or actual measurement) numerical value vector C of monitored amount ⁱ" " the initial value of monitored amount vector C together ⁱ _o", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" and " current nominal virtual lesion vector d ⁱ _c" between linear approximate relationship, shown in (9) or formula (10).

$C^i=C_o^i+\mathrm{\Δ}{C}^i\·d_c^i---\left(9\right)$

$C^i-C_o^i=\mathrm{\Δ}{C}^i\·d_c^i---\left(10\right)$

Current (calculating or actual measurement) numerical value vector C of monitored amount in formula (9) and the formula (10) ⁱDefinition be similar to the initial value vector C of monitored amount ⁱ _oDefinition, see formula (11); Cable system " current nominal virtual lesion vector d ⁱ _c" definition see formula (12).

$C^i={\left[\begin{array}{cccccc}{C}_1^i& C_2^i& \·\·\·& C_k^i& \·\·\·& C_M^i\end{array}\right]}^T---\left(11\right)$

Elements C in the formula (11) ⁱ _k(i=1,2,3 ....; K=1,2,3 ...., M; M 〉=N) be the i time circulation time Cable Structure, according to the current numerical value of the monitored amount of the pairing k of being numbered of coding rule.

$d_c^i={\left[\begin{array}{cccccc}{d}_{c1}^i& d_{c2}^i& \·\·\·& d_{\mathrm{cj}}^i& \·\·\·& d_{\mathrm{cN}}^i\end{array}\right]}^T---\left(12\right)$

D in the formula (12) ⁱ _Cj(i=1,2,3 ....; J=1,2,3 ...., N) be the current nominal virtual lesion value of cable system j root rope in the i time circulation, vectorial d ⁱ _cThe coding rule and the matrix Δ C of subscript j of element ⁱThe coding rule of row identical.

When the rope actual damage was not too big, because the Cable Structure material still is in the linear elasticity stage, the distortion of Cable Structure was also less, and the represented a kind of like this linear relationship of formula (9) or formula (10) is less with the error of actual conditions, and error can be used error vector e ⁱ(formula (13)) definition, the error of linear relationship shown in expression (9) or the formula (10).

$e^i=\mathrm{abs}(\mathrm{\Δ}{C}^i\·d_c^i-C^i+C_o^i)---\left(13\right)$

Abs () is the function that takes absolute value in the formula (13), and each element of the vector of trying to achieve in the bracket is taken absolute value.

Because there are certain error in formula (9) or the represented linear relationship of formula (10), therefore can not be simply according to formula (9) or formula (10) and " current (actual measurement) numerical value vector C of monitored amount ⁱ" directly find the solution and obtain " current nominal virtual lesion vector d ⁱ _c".If done like this, the vectorial d that obtains ⁱ _cIn element in addition bigger negative value can appear, just negative damage, this obviously is irrational.Therefore obtain vectorial d ⁱ _cAcceptable separating (promptly have reasonable error, but can determine the position and the virtual lesion degree thereof of virtual damaged cable more exactly) become a rational solution, available formula (14) is expressed this method.

$\mathrm{abs}(\mathrm{\Δ}{C}^i\·d_c^i-C^i+C_o^i)\≤g^i---\left(14\right)$

Abs () is the function that takes absolute value in the formula (14), vectorial g ⁱDescription departs from the reasonable deviation of ideal linearity relation (formula (9) or formula (10)), is defined by formula (15).

$g^i={\left[\begin{array}{cccccc}{g}_1^i& g_2^i& \·\·\·& g_k^i& \·\·\·& g_M^i\end{array}\right]}^T---\left(15\right)$

G in the formula (15) ⁱ _k(i=1,2,3 ....; K=1,2,3 ...., M) maximum allowable offset that departs from the ideal linearity relation shown in formula (9) or the formula (10) in the i time circulation has been described.Vector g ⁱCan be according to the error vector e of formula (13) definition ⁱTentative calculation is selected.

At " the initial value vector C of monitored amount ⁱ _o" (survey or calculate), " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" (calculating) and " the current numerical value vector C of monitored amount ⁱ" when (actual measurement obtains) is known, can utilize suitable algorithm (for example multi-objective optimization algorithm) to find the solution formula (14), obtain " current nominal virtual lesion vector d ⁱ _c" acceptable separating, " current actual virtual lesion vector d then ⁱThe element of (formula (16) is seen in definition) can calculate according to formula (17), has just obtained " " current actual virtual lesion vector d ⁱThereby, can be by d ⁱDetermine the position and the virtual lesion degree of virtual damaged cable,, just determined to need to adjust rope and the long adjustment amount of rope thereof of Suo Li then according to position and the relax level of below the method for narration being determined slack line.

$d^i={\left[\begin{array}{cccccc}{d}_1^i& d_2^i& \·\·\·& d_j^i& \·\·\·& d_N^i\end{array}\right]}^T---\left(16\right)$

D in the formula (16) ⁱ _j(i=1,2,3, J=1,2,3 ...., N) the actual virtual lesion value of j root rope in the i time circulation of expression, formula (17), d are seen in its definition ⁱ _jBeing that to represent that j root rope not damaged did not have at 0 o'clock lax, is to represent that this rope thoroughly lost load-bearing capacity at 100% o'clock, represents the load-bearing capacity of j root rope forfeiture corresponding proportion in the time of between 0 and 100%, vectorial d ⁱThe coding rule of element and formula (1) in vectorial d ⁱ _oThe coding rule of element identical.

$d_j^i=1-(1-d_{\mathrm{oj}}^i)(1-d_{\mathrm{cj}}^i)---\left(17\right)$

D in the formula (17) ⁱ _Oj(i=1,2,3,4, J=1,2,3 ...., N) be vectorial d ⁱ _oJ element, d ⁱ _CjBe vectorial d ⁱ _cJ element.

Narration has obtained the actual virtual lesion vector of Suo Dangqian d below ⁱAfter, how to determine the position and the relax level of slack line.

If total N root support cable in the cable system, structure rope force data is described by the Suo Li of N root support cable.Available " initial rope force vector F _o" the initial Suo Li (formula (18) is seen in definition) of all support cables in the expression Cable Structure.Because the initial Suo Li that calculates gained based on the calculating benchmark model of Cable Structure approaches the measured data of initial Suo Li reliably, in the narration of back, will represent this calculated value and measured value with prosign.

F _o＝[F _o1?F _o2…F _oj…F _oN] ^T (18)

F in the formula (18) _Oi(j=1,2,3 ...., N) being the initial Suo Li of j root support cable in the Cable Structure, this element is according to the Suo Li of coding rule corresponding to the appointment support cable.Vector F _oBe constant, irrelevant with cycle index, after when circulation beginning for the first time, determining, just no longer change.Setting up the Mechanics Calculation benchmark model A of Cable Structure ¹The time used vectorial F _o

Use " current cable force vector F among the present invention ⁱ" the i time circulation time of expression survey the current cable power (formula (19) is seen in definition) of all support cables in the Cable Structure that obtains.

$F^i={\left[\begin{array}{cccccc}{F}_1^i& F_2^i& \·\·\·& F_j^i& \·\·\·& F_N^i\end{array}\right]}^T---\left(19\right)$

F in the formula (19) ⁱ _j(i=1,2,3,4, J=1,2,3 ...., N) be the current cable power of j root support cable in the i time circulation time Cable Structure.

Among the present invention, under support cable original state (not damaged, do not have lax), and support cable is when being in free state (free state refers to that Suo Li is 0, back with), and the length of support cable is called initial drift, with " initial drift vector l _o" the initial drift (formula (20) is seen in definition) of all support cables in the expression Cable Structure.

l _o＝[l _o1?l _o2…L _oj…L _oN] ^T (20)

L in the formula (20) _Oj(j=1,2,3 ...., N) be the initial drift of j root support cable in the Cable Structure.Vector l _oBe constant, irrelevant with cycle index, after when circulation beginning for the first time, determining, just no longer change.

Among the present invention, with " current drift vector l ⁱ" the current drift (formula (21) is seen in definition) of all support cables in the i time circulation time Cable Structure of expression.

$l^i={\left[\begin{array}{cccccc}{l}_1^i& l_2^i& \·\·\·& l_j^i& \·\·\·& l_N^i\end{array}\right]}^T---\left(21\right)$

L in the formula (21) ⁱ _j(i=1,2,3,4, J=1,2,3 ..., N) be the current drift of j root support cable in the i time circulation time Cable Structure.

Among the present invention, with " drift changes vectorial Δ l ⁱ" the change amount (formula (22) and formula (23) are seen in definition) of the drift of all support cables in the i time circulation time Cable Structure of (or claim support cable current relax level vector) expression.

${\mathrm{\Δl}}^i={\left[\begin{array}{cccccc}{\mathrm{\Δl}}_1^i& {\mathrm{\Δl}}_2^i& \·\·\·& {\mathrm{\Δl}}_j^i& \·\·\·& \mathrm{\Δ}{l}_N^i\end{array}\right]}^T---\left(22\right)$

Δ l in the formula (22) ⁱ _j(i=1,2,3,4, J=1,2,3 ...., be the change amount of the drift of j root support cable in current (the i time circulation time) Cable Structure N), formula (23), Δ l are seen in its definition ⁱ _jBe not that 0 rope is a slack line, Δ l ⁱ _jNumerical value be the slack of rope, and the current relax level of expression cable system j root support cable also is the long adjustment amount of rope of this rope when adjusting Suo Li.

$\mathrm{\Δ}{l}_j^i=l_j^i-l_{\mathrm{oj}}---\left(23\right)$

By slack line is carried out the relax level identification that slack line is carried out in the mechanics equivalence with damaged cable, the mechanical condition of equivalence is in the present invention:

The mechanics parameters of initial drift, geometrical property parameter and material when one, the nothing of the rope of two equivalences relaxes with not damaged is identical;

Two, after the lax or damage, the Suo Li of the slack line of two equivalences and damage rope be out of shape after length overall identical.

When satisfying above-mentioned two equivalent conditions, the such mechanics function of two support cables in structure is exactly identical, if after promptly replacing slack line with the damaged cable of equivalence, Cable Structure any variation can not take place, vice versa.

Among the present invention, the i time circulation time is with j support cable (its current relax level Δ l ⁱ _jDefinition) carries out the current actual virtual lesion degree d of virtual impaired support cable of equivalence ⁱ _jExpression (d ⁱ _jDefinition see formula (16) and formula (17)).The current relax level Δ l of j lax support cable ⁱ _j(Δ l ⁱ _jDefinition see formula (22)) with the current actual virtual lesion degree d of damaged cable of equivalence ⁱ _jBetween relation determine by aforementioned two mechanics equivalent conditions.Δ l ⁱ _jSame d ⁱ _jBetween physical relationship can adopt accomplished in many ways, for example can directly determine (referring to formula (24)) according to aforementioned equivalent condition, also can adopt based on the Ernst equivalent elastic modulus to replace the E in the formula (24) to revise back definite (referring to formula (25)), also can adopt and determine based on other methods such as trial and error procedure of finite element method.

$\mathrm{\Δ}{l}_j^i=\frac{d_j^i}{1-d_j^i}\frac{F_j^i}{\mathrm{EA}+F_j^i}{l}_{\mathrm{oj}}---\left(24\right)$

$\mathrm{\Δ}{l}_j^i=\frac{d_j^i}{1-d_j^i}\frac{F_j^i}{\left[\frac{E}{1+\frac{{\left({\mathrm{\ω}}_j{l}_{\mathrm{jx}}^i\right)}^2\mathrm{AE}}{12{\left(F_j^i\right)}^3}}\right]A+F_j^i}{l}_{\mathrm{oj}}---\left(25\right)$

E is the elastic modulus of this support cable in formula (24) and the formula (25), and A is the cross-sectional area of this support cable, F ⁱ _jBe the current cable power of this support cable, d ⁱ _jBe the current actual virtual lesion degree of this support cable, ω _iBe the weight of the unit length of this support cable, l ⁱ _JxIt is the horizontal range of two supporting end points of this support cable.Item in the formula (25) in [] is the Ernst equivalent elastic modulus of this support cable, can just can determine the current relax level vector of support cable Δ l by formula (24) or formula (25) ⁱFormula (25) is the correction to formula (24).

The 4th step: judge whether to finish this (the i time) circulation, if, then finish the preceding tailing in work of this loop ends, for next time (promptly the i+1 time, i=1,2,3,4 ...) circulation preparation Mechanics Calculation benchmark model and necessary vector.Detailed process is as follows.

In this (the i time) circulation, try to achieve " current nominal virtual lesion vector d ⁱ _c" after, at first, set up " mark vector B according to formula (26) ⁱ", formula (27) has provided " mark vector B ⁱ" the definition of j element; If " mark vector B ⁱ" element be 0 entirely, then in this circulation, continue health monitoring and calculating to cable system; If " mark vector B ⁱ" element be not 0 entirely, then finish subsequent step after, enter next time circulation.So-called subsequent step is: at first, according to formula (28) calculate next time (promptly the i+1 time, i=1,2,3,4 ...) required " the initial virtual lesion vector d of circulation ^I+1 _o" each element d ^I+1 _OjThe second, at Mechanics Calculation benchmark model A ⁱ(i=1,2,3,4 ...) or the not damaged model A of Cable Structure ⁰The basis on, the health status that makes rope is d ^I+1 _oThe back upgrade and to obtain next time (the i+1 time, i=1,2,3,4 ...) the required Mechanics Calculation benchmark model A of circulation ^I+1At last, by to Mechanics Calculation benchmark model A ^I+1The initial value that calculates monitored amount, by its form next time (promptly the i+1 time, i=1,2,3,4 ...) required " the initial value vector C of monitored amount of circulation ^I+1 _o" (i=1,2,3,4 ...).

$B^i={\left[\begin{array}{cccccc}{B}_1^i& B_2^i& \·\·\·& B_j^i& \·\·\·& B_N^i\end{array}\right]}^T---\left(26\right)$

Mark vector B in the formula (26) ⁱSubscript i represent the i time the circulation, its element B ⁱ _j(j=1,2,3 ..., subscript j N) represents the damage characteristic of j root rope, can only get 0 and 1 two amount, concrete value rule is seen formula (27).

$B_j^i=\left\{\begin{array}{ccc}0,& \mathrm{if}& d_{\mathrm{cj}}^i<D_{\mathrm{uj}}^i\\ 1,& \mathrm{if}& d_{\mathrm{cj}}^i\&GreaterEqual;D_{\mathrm{uj}}^i\end{array}\right.---\left(27\right)$

Element B in the formula (27) ⁱ _jBe " mark vector B ⁱ" j element, D ⁱ _UjBe " nominal virtual unit damage vector D ⁱ _u" j element (seeing formula (3)), d ⁱ _CjBe " current nominal virtual lesion vector d ⁱ _c" j element (seeing formula (12)), they all represent the relevant information of j root rope.

$d_{\mathrm{oj}}^{i+1}=1-(1-d_{\mathrm{oj}}^i)(1-D_{\mathrm{uj}}^i{B}_j^i)---\left(28\right)$

D in the formula (28) ⁱ _UjBe " nominal virtual unit damage vector D ⁱ _u" j element (seeing formula (3)), d ⁱ _CjBe " current nominal virtual lesion vector d ⁱ _c" j element (seeing formula (12)).

Second portion of the present invention: the software and hardware part of health monitoring systems.Hardware components comprises monitoring system (monitoring the horizontal range of monitored amount, Suo Li, support cable two supporting end points), signal picker and computing machine etc.Requirement is monitored each monitored amount in real time or quasi real time, monitors the Suo Li of each support cable, is monitored the horizontal range that each support cable two supports end points.Software should the following function of tool: software section should be finished the process that first of the present invention sets, i.e. the data in real time that at first transmits according to monitoring system or quasi real time analyze the current numerical value vector C that obtains monitored amount ⁱ, the monitored numerical quantity transformation matrices of the virtual unit damage of reading pre-stored Δ C then ⁱ, monitored amount initial value vector C ⁱ _oWith nominal virtual unit damage vector D ⁱ _u, find the solution formula (14) according to suitable algorithm (for example multi-objective optimization algorithm), obtain current nominal virtual lesion vector d ⁱ _cNoninferior solution, obtain current actual virtual lesion vector d according to formula (17) ⁱ, just have reasonable error but can be more exactly from cable system, determine the position of virtual damaged cable and separating of virtual lesion degree thereof.Try to achieve the relax level that those are judged as slack line according to the mechanics equivalent condition. software section also will be according to the mark vector B that circulates and try to achieve each time ⁱConcrete condition judge whether to enter next time circulation.

The inventive method specifically comprises:

A. establish total N root rope, at first determine the coding rule of rope, with rope numberings all in the Cable Structure, this numbering will be used to generate the vector sum matrix in subsequent step by this rule;

B. determine the monitored point of appointment, give all specified point numberings; Determine the monitored straight line of each monitoring point, gave the monitored straight line numbering of all appointments; Determine the monitored angle coordinate component of each monitored straight line, give all monitored angle coordinate component numberings." monitored angle coordinate component numbering " will be used to generate the vector sum matrix in subsequent step." the whole monitored angle-data of structure " is made up of above-mentioned all measured angle coordinate components." the monitored angle-data of structure " abbreviated as " monitored amount ".The quantity of monitored point must not be less than the quantity of rope; The quantity sum of all monitored strains must not be less than the quantity of rope;

C. the data of utilizing the Non-Destructive Testing data etc. of rope can express the health status of rope are set up initial virtual lesion vector d ⁱ _o, wherein i represents cycle index, back i and subscript i represent cycle index, and i=1,2,3 ...; Circulation time d for the first time ⁱ _oBe designated as d ¹ _oIf when not having the data of the Non-Destructive Testing data of rope and other health status that can express rope, can think perhaps that the structure original state is lax for not having, during the not damaged state, vectorial d ¹ _oEach element numerical value get 0.

D. setting up initial virtual lesion vector d ¹ _oThe time, directly measurement calculates the initial value of all monitored amounts of Cable Structure, forms the initial value vector C of monitored amount ¹ _o

E. setting up initial virtual lesion vector d ¹ _oInitial value vector C with monitored amount ¹ _oThe time, directly measure the initial Suo Li that calculates all support cables, form initial rope force vector F _oSimultaneously, obtain the initial drift of all support cables, form initial drift vector l according to structural design data, completion data _oSimultaneously, obtain the initial geometric data of Cable Structure according to structural design data, completion data or actual measurement; Simultaneously, survey or obtain elastic modulus, density, the initial cross sectional area of all ropes according to structural design, completion information;

F. according to the above-mentioned measured data of design drawing, as-constructed drawing and the Cable Structure of Cable Structure, set up the mechanics model of Cable Structure, computational data based on this Model Calculation gained is approaching more good more with above-mentioned measured data, and this moment, this model was called as the Mechanics Calculation benchmark model A of structure ¹A ¹The health status of corresponding rope is by d ¹ _oDescribe;

G. at Mechanics Calculation benchmark model A ⁱThe basis on carry out the several times Mechanics Calculation, by calculate obtaining " nominal virtual unit damage vector D ⁱ _u" and " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ".Wherein i represents cycle index, and back i and subscript i represent cycle index, i=1, and 2,3 ....A ⁱThe health status of corresponding rope is by d ⁱ _oDescribe;

H. actual measurement obtains the current cable power of all support cables of Cable Structure, forms current cable force vector F ⁱSimultaneously, actual measurement obtain Cable Structure all specify the current measured value of monitored amount, form " the current numerical value vector C of monitored amount ⁱ".Actual measurement calculates the horizontal range of two supporting end points of all support cables.When numbering to the element of the institute's directed quantity that occurred before this step and this step, should use same coding rule, each vector that can guarantee before this step and this step like this and occur afterwards, number identical element, represent same monitored amount, corresponding to vectorial defined relevant information under this element;

I. define current nominal virtual lesion vector d to be asked ⁱ _cWith current actual virtual lesion vector d ⁱDamage vectorial d ¹ _o, d ⁱ _cAnd d ⁱElement number equal the quantity of rope, be one-to-one relationship between the element of damage vector and the rope, the element numerical value of damage vector is represented the virtual lesion degree or the health status of corresponding rope;

J. according to " the current numerical value vector C of monitored amount ⁱ" " the initial value of monitored amount vector C together ⁱ _o", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" and " current nominal virtual lesion vector d ⁱ _c" between the linear approximate relationship that exists, this linear approximate relationship can be expressed as formula 1, removes d in the formula 1 ⁱ _cOther outer amount is known, finds the solution formula 1 and just can calculate current nominal virtual lesion vector d ⁱ _c

$C^i=C_o^i+\mathrm{\&Delta;}{C}^i\&CenterDot;d_c^i$ Formula 1

K. the current actual virtual lesion vector d that utilizes formula 2 to express ⁱElement d ⁱ _jWith initial virtual lesion vector d ⁱ _oElement d ⁱ _OjWith current nominal virtual lesion vector d ⁱ _cElement d ⁱ _CjBetween relation, calculate current actual virtual lesion vector d ⁱAll elements.

$d_j^i=1-(1-d_{\mathrm{oj}}^i)(1-d_{\mathrm{cj}}^i)$ Formula 2

J=1 in the formula 2,2,3 ..., N.

Because current actual virtual lesion vector d ⁱElement numerical value represent the current actual virtual lesion degree of corresponding rope, promptly actual relax level or actual damage degree, current actual virtual lesion vector d ⁱIn numerical value be not that the support cable of 0 element correspondence is exactly problematic support cable, problematic support cable may be slack line, also may be damaged cable, its numerical response the degree of lax or damage;

L. identify damaged cable from the problematic support cable that k identified the step, remaining is exactly slack line.

M. utilize the current actual virtual lesion vector d that obtains in the k step ⁱObtain the current actual virtual lesion degree of slack line, utilize the current cable force vector F that obtains in the h step ⁱ, utilize two horizontal ranges that support end points in all support cables of h step acquisition, utilize the vectorial l of the initial drift that obtains in the e step _oUtilization is in elastic modulus, density, the initial cross sectional area data of all ropes of e step acquisition, by with slack line with damaged cable carry out the mechanics equivalence calculate slack line, with the relax level of current actual virtual lesion degree equivalence, the mechanical condition of equivalence is: one, the mechanics parameters of lax initial drift, geometrical property parameter, density and the material during with not damaged of the nothing of the rope of two equivalences is identical; Two, after the lax or damage, the Suo Li of the slack line of two equivalences and damage rope be out of shape after length overall identical.When satisfying above-mentioned two equivalent conditions, the such mechanics function of two support cables in structure is exactly identical, if after promptly replacing damaged cable with the slack line of equivalence, Cable Structure any variation can not take place, vice versa.Try to achieve the relax level that those are judged as slack line according to aforementioned mechanics equivalent condition, relax level is exactly the change amount of support cable drift, has just determined the long adjustment amount of rope of the support cable that those need adjust Suo Li.The lax identification and the damage identification of support cable have so just been realized.Institute's demand power is by current cable force vector F during calculating ⁱCorresponding element provides.

N. try to achieve current nominal virtual lesion vector d ⁱ _cAfter, set up mark vector B according to formula 3 ⁱ, formula 4 has provided mark vector B ⁱThe definition of j element;

$B^i={\left[\begin{array}{cccccc}{B}_1^i& B_2^i& \&CenterDot;\&CenterDot;\&CenterDot;& B_j^i& \&CenterDot;\&CenterDot;\&CenterDot;& B_N^i\end{array}\right]}^T$ Formula 3

$B_j^i=\left\{\begin{array}{ccc}0,& \mathrm{if}& d_{\mathrm{cj}}^i<D_{\mathrm{uj}}^i\\ 1,& \mathrm{if}& d_{\mathrm{cj}}^i\&GreaterEqual;D_{\mathrm{uj}}^i\end{array}\right.$ Formula 4

Element B in formula 3, the formula 4 ⁱ _jBe mark vector B ⁱJ element, D ⁱ _UjBe nominal virtual unit damage vector D ⁱ _uJ element, d ⁱ _CjBe current nominal virtual lesion vector d ⁱ _cJ element, they all represent the relevant information of j root rope.J=1 in the formula 4,2,3 ..., N.

If mark vector B o. ⁱElement be 0 entirely, then get back to h step and continue this circulation; If mark vector B ⁱElement be not 0 entirely, then enter next step, i.e. p step.

P. according to formula 5 calculate next time, i.e. the required initial virtual lesion vector d of the i+1 time circulation ^I+1 _oEach element d ^I+1 _Oj

$d_{\mathrm{oj}}^{i+1}=1-(1-d_{\mathrm{oj}}^i)(1-D_{\mathrm{uj}}^i{B}_j^i)$ Formula 5

D in the formula 5 ⁱ _UjBe the nominal virtual unit damage vector of the i time circulation D ⁱ _uJ element, d ⁱ _CjBe the current nominal virtual lesion vector d of the i time circulation ⁱ _cJ element, B ⁱ _jBe the i time circulation mark vector B ⁱJ element.J=1 in the formula 5,2,3 ..., N.

Q. at Mechanics Calculation benchmark model A ⁱThe basis on, the health status that makes rope is d ^I+1 _oThe back renewal obtains next time, required Mechanics Calculation benchmark model A promptly circulates for the i+1 time ^I+1

R. pass through Mechanics Calculation benchmark model A ^I+1Calculate corresponding to model A ^I+1The numerical value of all monitored amounts of structure, these numerical value are formed next time, the vectorial C of initial value of the required monitored amount that promptly circulates for the i+1 time ^I+1 _o

S. get back to the g step, beginning is circulation next time.

In step g, obtain " nominal virtual unit damage vector D ⁱ _u" and " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" method be:

G1. at the Mechanics Calculation benchmark model A of structure ⁱThe basis on carry out the several times Mechanics Calculation, equal the quantity of all ropes on the calculation times numerical value, there is N root rope that N calculating is just arranged, calculating each time in the hypothesis cable system has only a rope to increase virtual unit damage again on the basis of original virtual lesion, the rope that occurs virtual unit damage in calculating each time is different from the rope that occurs virtual unit damage in other time calculating, and supposition each time has the virtual unit damage value of the rope of virtual unit damage can be different from the virtual unit damage value of other ropes, uses " nominal virtual unit damage vector D ⁱ _u" write down the unit damage of the supposition of all ropes, calculate the current numerical value of all monitored amounts each time, the current numerical value of the monitored amount of all that calculate is formed one " the current numerical value vector of the calculating of monitored amount " each time.When hypothesis j root rope has unit damage, available C ⁱ _Tj" the current evaluation vector C of monitored amount that expression is corresponding ⁱ _Tj".When giving each vectorial element numbering in this step, should use same coding rule with other vector among the present invention, can guarantee any one element in each vector in this step like this, with element in other vector, that numbering is identical, expressed the relevant information of same monitored amount or same target;

G2. that calculates each time " the current evaluation vector C of monitored amount ⁱ _Tj" deduct " initial value of monitored amount vector C ⁱ _o" obtain a vector, during all calculating divided by this, each element that again should vector obtains one " the numerical value change vector of monitored amount " after the virtual unit damage value of supposition; There is N root rope that N " the numerical value change vector of monitored amount " just arranged;

G3. form " the monitored numerical quantity transformation matrices of the virtual unit damage Δ C that the N row are arranged successively by this N " the numerical value change vector of monitored amount " ⁱ".The coding rule of the row of " the monitored numerical quantity transformation matrices of virtual unit damage " and current nominal virtual lesion vector d ⁱ _cWith current actual virtual lesion vector d ⁱThe element coding rule identical.

Beneficial effect: system and method disclosed by the invention is having under the synchronously impaired or lax condition of more rope (for example more than 30 ropes or more than 30% rope) monitoring and evaluation very exactly go out the health status (position and relax level or the degree of injury that comprise all slack lines and damaged cable) of cable system.This is because " the current numerical value vector C of monitored amount ⁱ" " the initial value of monitored amount vector C together ⁱ _o", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" and " current nominal virtual lesion vector d ⁱ _c" between linear relationship be similar to; be actually nonlinear relation; when particularly more the or extent of damage is big at damaged cable; the nonlinear characteristic of the relation between the above-mentioned amount is more obvious; for overcoming this obstacle, the invention discloses a kind of health monitor method that approaches this nonlinear relationship in the minizone with linear relationship.In fact the present invention has used the method with linear relationship piecewise approximation nonlinear relationship, big interval is divided into minizone one by one, in each minizone internal linear relation all is enough accurately, the health status of the cable system that obtains according to its judgement also is reliably, and therefore system and method disclosed by the invention is very useful to effective health monitoring of cable system.

Embodiment

At the health monitoring of the cable system of Cable Structure, the invention discloses a kind of system and method for health status of each root rope of the cable system that can monitor Cable Structure rationally and effectively.The following describes of embodiments of the invention in fact only is exemplary, and purpose never is to limit application of the present invention or use.

The present invention adopts a kind of algorithm, and this algorithm is used for monitoring the health status (relax level and the extent of damage that comprise rope) of the cable system of Cable Structure.During concrete enforcement, the following step is a kind of in the various steps that can take.

The first step: determine type, position and the quantity of monitored amount, and numbering.Detailed process is:

At first determine the coding rule of rope, all ropes are numbered by this rule.This numbering will be used to generate the vector sum matrix in subsequent step.

If total N root rope in the cable system.Determine the measured point (promptly all characterize the specified point of structure angle displacement, are provided with K specified point) of appointment, give all specified point numberings; Determine the measured straight line (established each measurement point L appointment straight line arranged) of each measurement point, gave the measured straight line numbering of all appointments; Determine the measured angle coordinate component (establish each measured straight line H angle coordinate component arranged) of each measured straight line, give all measured angle coordinate component numberings.Above-mentioned numbering will be used to generate the vector sum matrix equally in subsequent step." the whole monitored angle-data of structure " described by H angle coordinate component L appointment straight line K specified point, that cross each specified point, each appointment straight line on top definite structure, and the variation of structure angle is exactly the variation of the angle coordinate component of all appointments all specified points, all appointment straight lines.(individual angle coordinate component measurement value of M=K * L * H) or calculated value characterize the angle information of structure to each total M.K and M must not be less than the quantity N of support cable.For simplicity, in the present invention " the monitored angle-data of structure " is called " monitored amount ".Each specified point can be exactly the fixed endpoint (drag-line that for example is cable-stayed bridge is at the stiff end on the bridge floor) or a near point it of each root rope; The quantity of measurement point generally must not be less than the quantity of rope.Can only measure an angle coordinate of specifying straight line at each specified point, for example measure the angle coordinate of the body structure surface normal of specified point with respect to the acceleration of gravity direction, in fact be exactly measurement of dip angle here.

Second step: the data of utilizing the Non-Destructive Testing data etc. of rope can express the health status of rope are set up initial virtual lesion vector d ¹ _oIf when not having the data of the Non-Destructive Testing data of rope and other health status that can express rope, perhaps can think when the structure original state is not damaged, no relaxed state vectorial d ¹ _oEach element numerical value get 0.

The 3rd step: setting up initial virtual lesion vector d ¹ _oThe time, directly measurement calculates the initial value of all monitored amounts of Cable Structure, forms " the initial value vector C of monitored amount ¹ _o"; Simultaneously, directly measure the initial Suo Li of all support cables that calculate Cable Structure, form " initial rope force vector F _o"; Simultaneously, obtain the initial drift of all ropes, form " the initial drift vector of support cable l according to structural design data, completion data _o"; Simultaneously, survey or obtain elastic modulus, density, the initial cross sectional area of all ropes according to structural design, completion information.

The 4th step: setting up initial virtual lesion vector d ¹ _oThe time, can adopt ripe measuring method to carry out cable force measurement, strain measurement, measurement of angle and volume coordinate and measure.Calculate Cable Structure original geometric form data (is exactly its initial bridge type data for cable-stayed bridge) after directly measuring or measuring, the original geometric form data of Cable Structure can be the spatial datas that the spatial data of the end points of all ropes adds a series of point on the structure, and purpose is to determine according to these coordinate datas the geometric properties of Cable Structure.For cable-stayed bridge, the original geometric form data can be the spatial datas that the spatial data of the end points of all ropes adds some points on the bridge two ends, so-called bridge type data that Here it is.

Design drawing according to Cable Structure, the measured data of as-constructed drawing and Cable Structure (can comprise structure original geometric form data, the initial angle coordinate data, data such as the initial Suo Li of all ropes, to cable-stayed bridge, suspension bridge and the bridge type data of Yan Shiqiao, the angle coordinate data, data such as rope force data), utilize mechanics method (for example adopting finite element method) to set up the Mechanics Calculation benchmark model of this structure (for example finite element benchmark model), computational data based on this Model Calculation gained is approaching more good more with above-mentioned measured data, difference therebetween generally must not be greater than 5%, and this moment, this model was called as the Mechanics Calculation benchmark model A of structure ¹

The 5th step: the hardware components of pass line structural healthy monitoring system.Hardware components comprises at least: horizontal range monitoring system (for example measuring with total powerstation), signal (data) collector, the computing machine and the panalarm of communicating by letter of monitored amount monitoring system (for example containing measurement of angle sensor, signal conditioner etc.), cable force monitoring system (for example containing acceleration transducer, signal conditioner etc.), each support cable two supporting end points.The horizontal range of the Suo Li of each monitored amount, each support cable and each root support cable two supporting end points all must arrive by monitored system monitoring, and monitoring system is transferred to signal (data) collector with the signal that monitors; Signal is delivered to computing machine through signal picker; Computing machine then is responsible for the health monitoring software of the cable system of operation Cable Structure, comprises the signal that the transmission of tracer signal collector comes; Have lax or during damage when monitoring rope, the computer control communication panalarm to monitor staff, owner and (or) personnel of appointment report to the police.

The 6th step: establishment and the cable system health monitoring systems software of pass line structure on supervisory control comuter.All move this software at circulation time each time, this software is all the time in operation in other words.This software comprises following several functional module:

1. finish this step and be other calculating, control and monitoring work in steps, and can be according to the condition of setting (for example virtual lesion reaches a certain value), notice or prompting monitor staff notify specific technician to finish necessary evaluation work automatically.

2. read " the initial value vector C of monitored amount the data file on being stored in hard disc of computer ⁱ _o" and " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" wait all call parameters.Express cycle index with i among the present invention, i=1 when carrying out this step for the first time, back i and subscript i represent cycle index, i=1,2,3 ...; Express the relevant information of j root rope with j, j=1,2,3 ..., N.

3. the signal that transmits by signal picker of (or trigger-type) at random record regularly.

4. the signal to record carries out signal Processing, calculates the current numerical value of all monitored amounts to be measured, and the current numerical value of all monitored amounts is formed " the current numerical value vector C of monitored amount ⁱ".Signal to record carries out signal Processing, calculates the current cable power of all support cables of Cable Structure, forms current cable force vector F ⁱSignal to record carries out signal Processing, calculates the horizontal range of two supporting end points of all support cables.

5. according to " current (calculating or actual measurement) numerical value vector C of monitored amount ⁱ" " the initial value of monitored amount vector C together ⁱ _o", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" and " current nominal virtual lesion vector d ⁱ _c" between the linear approximate relationship (seeing formula (9)) that exists, calculate the current nominal virtual lesion vector d of cable system according to multi-objective optimization algorithm ⁱ _cNoninferior solution.

The multi-objective optimization algorithm that can adopt has a variety of, for example: based on the multiple-objection optimization of genetic algorithm, based on the multiple-objection optimization of artificial neural network, based on the multi-objective optimization algorithm of population, multiple-objection optimization, leash law (Constrain Method), weighted method (Weighted Sum Method), goal programming method (Goal Attainment Method) or the like based on ant group algorithm.Because various multi-objective optimization algorithms all are conventional algorithms, can realize easily that this implementation step is that example provides and finds the solution current nominal virtual lesion vector d with the goal programming method only ⁱ _cProcess, the specific implementation process of other algorithm can realize in a similar fashion according to the requirement of its specific algorithm.

According to the goal programming method, formula (9) can transform the multi-objective optimization question shown in an accepted way of doing sth (29) and the formula (30), γ in the formula (29) ⁱBe a real number, R is a real number field, and area of space Ω has limited vectorial d ⁱ _cSpan (the present embodiment requirements vector d of each element ⁱ _cEach element be not less than 0, be not more than 1).The meaning of formula (29) is to seek the real number γ of an absolute value minimum ⁱ, make formula (30) be met.G (d in the formula (30) ⁱ _c) by formula (31) definition, weighing vector W in the formula (30) ⁱWith γ ⁱProduct representation formula (30) in G (d ⁱ _c) and vectorial g ⁱBetween the deviation that allows, g ⁱDefinition referring to formula (15), its value will the 8th the step calculate.Vector W during actual computation ⁱCan with vectorial g ⁱIdentical.The concrete programming of goal programming method realizes having had universal program directly to adopt.Just can be according to the goal programming method in the hope of the vectorial d of current name damage ⁱ _c

minimize γ ⁱ (29)

γ ⁱ∈R， $d_c^i\&Element;\mathrm{\&Omega;}$

$G\left(d_c^i\right)-W^i{\mathrm{\&gamma;}}^i\&le;g^i---\left(30\right)$

$G\left(d_c^i\right)\mathrm{abs}(\mathrm{\&Delta;}{C}^i\&CenterDot;d_c^i-C^i+C_o^i)---\left(31\right)$

Try to achieve current nominal virtual lesion vector d ⁱ _cAfter, can be according to the vectorial d of the current actual virtual lesion that formula (17) obtain ⁱEach element, current actual virtual lesion vector d ⁱHave reasonable error exactly but can be more exactly from all ropes, determine the position of problematic rope (be virtual damaged cable, may be impaired also may be lax) and separating of virtual lesion degree.If the current actual virtual lesion vector d that solves ⁱThe numerical value of a certain element be 0, represent that the pairing rope of this element is intact, not damage or lax; If its numerical value is 100%, represent that then the pairing rope of this element has completely lost load-bearing capacity; If its numerical value between 0 and 100%, is then represented this rope and has been lost the load-bearing capacity of corresponding proportion.

6. data systematic function.Can regularly or by the personnel operation health monitoring systems generate cable system health condition form.

7. warning function.Under specified requirements, automatically the operation communication panalarm to monitor staff, owner and (or) personnel of appointment report to the police.

8. those are judged to be lax support cable, use the current actual virtual lesion vector d that tries to achieve ⁱCorresponding to the element numerical value of this support cable, utilize and measure the current cable force vector F that obtains in (concrete grammar will be listed in the back) ⁱIn corresponding to the element numerical value of this support cable, utilize the horizontal ranges of two supporting end points measuring all support cables that obtain, utilize and measure the initial drift vector l that obtains _o, utilize elastic modulus, density, the initial cross sectional area data of all known ropes, can be according to formula (24) or formula (25) in the hope of the relax level (being the long adjustment amount of rope) of these ropes.The health monitoring that has so just realized having comprised lax identification and damaged the cable system of the Cable Structure of discerning.

The 7th step: at Mechanics Calculation benchmark model A ⁱCarry out the several times Mechanics Calculation on the basis, equal the quantity of all ropes on the calculation times numerical value, there is N root rope that N calculating is just arranged, calculating each time in the hypothesis cable system has only a rope to increase virtual unit damage again on the basis of original virtual lesion, the rope that occurs virtual lesion in calculating each time is different from the rope that occurs virtual lesion in other time calculating, and supposition each time has the virtual unit damage value of the rope of damage can be different from the virtual unit damage value of other ropes, uses " nominal virtual unit damage vector D ⁱ _u" write down the virtual unit damage of the supposition of all ropes; calculate (for example adopting finite element method) each time and obtain that all specify the current numerical value of monitored amount in the Cable Structure, the current numerical value of the monitored amount of all that calculate is formed one " the current numerical value vector of the calculating of monitored amount " each time.When hypothesis j root rope has unit damage, available C ⁱ _Tj" the current numerical value vector of the calculating of monitored amount " that expression is corresponding.That that calculates " the current numerical value of the calculating of monitored amount vector C each time ⁱ _Tj" deduct " initial value of monitored amount vector C ⁱ _o" obtain a vector, during all calculating divided by this, each element that again should vector obtains " numerical value change vector δ a C of monitored amount after the virtual unit damage value of supposition ⁱ _j"; There is N root rope that N " the numerical value change vector δ C of monitored amount just arranged ⁱ _j" (j=1,2,3 ..., N).Form " the monitored numerical quantity transformation matrices of the virtual unit damage Δ C that the N row are arranged successively by this N " the numerical value change vector of monitored amount " ⁱ", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C in fact ⁱ" each row (for example j row) corresponding to one " the numerical value change vector of monitored amount " (δ C for example ⁱ _j).The coding rule of the row of " the monitored numerical quantity transformation matrices of virtual unit damage " and current nominal virtual lesion vector d ⁱ _cWith current actual virtual lesion vector d ⁱThe element coding rule identical.

Reach in this step when giving each vectorial element numbering thereafter, should use same coding rule with other vector among the present invention, can guarantee any one element in each vector in this step like this, with element in other vector, that numbering is identical, expressed the relevant information of same monitored amount or same target.

The 8th step: set up linear relationship error vector e ⁱWith vectorial g ⁱUtilize data (" the initial value vector C of monitored amount of front ⁱ _o", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ"), when the 7th step calculated each time, promptly in calculating each time, have only in the hypothesis cable system increase virtual unit damage again on the basis of rope at original virtual lesion in, calculate each time and form " virtual lesion vector a d ⁱ _t", virtual lesion vector d ⁱ _tElement number equal the quantity of rope, virtual lesion vector d ⁱ _tAll elements in have only the numerical value of an element to get to calculate each time in hypothesis increase the virtual unit damage value of the rope of virtual unit damage, d ⁱ _tThe numerical value of other element get 0, that is not numbering and the supposition of 0 the element corresponding relation that increases the rope of virtual unit damage, be identical with the element of the same numbering of other vectors with the corresponding relation of this rope; With C ⁱ _Tj, C ⁱ _o, Δ C ⁱ, d ⁱ _tBring formula (13) into and (note C in the formula (13) ⁱUse C ⁱ _TjBring d into ⁱ _cUse d ⁱ _tBring into), obtain a linear relationship error vector e ⁱ, calculate a linear relationship error vector e each time ⁱThere is N root rope that N calculating is just arranged, N linear relationship error vector e just arranged ⁱ, with this N linear relationship error vector e ⁱObtain a vector after the addition, the new vector that each element of this vector is obtained after divided by N is exactly final linear relationship error vector e ⁱVector g ⁱEqual final error vector e ⁱWith vectorial g ⁱBe kept on the hard disc of computer of operation health monitoring systems software, use for health monitoring systems software.

The 9th step: will " initial rope force vector F _o", " initial value of monitored amount vector C ⁱ _o", " nominal virtual unit damage vector D ⁱ _u", " initial drift vector l _o", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" and the parameters such as unit weight of the elastic modulus of all ropes, initial cross sectional area, rope be kept on the hard disc of computer of operation health monitoring systems software in the mode of data file.

The tenth step: the cable system health monitoring systems (containing hardware and software) of operation Cable Structure, finish following several function:

1. read " initial rope force vector F the data file on being stored in hard disc of computer _o", " initial value of monitored amount vector C ⁱ _o", " nominal virtual unit damage vector D ⁱ _u", " initial drift vector l _o", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" and all call parameters such as unit weight of the elastic modulus of all ropes, initial cross sectional area, rope.

2. the signal that transmits by signal picker of (or trigger-type) at random record regularly.

3. the signal to record carries out signal Processing, calculates the current numerical value of all monitored amounts to be measured, and the current numerical value of all monitored amounts is formed " the current numerical value vector C of monitored amount ⁱ".Signal to record carries out signal Processing, calculates the horizontal range of two supporting end points of all support cables.Signal to record carries out signal Processing, calculates the current cable power of all support cables of Cable Structure, forms current cable force vector F ⁱWhen numbering to the element of the institute's directed quantity that occurred before this step and this step, should use same coding rule, can guarantee the element each vector, that numbering is identical that occurs before this step and this step like this, represent same monitored amount, corresponding to vectorial defined relevant information under this element.

4. according to " current (calculating or actual measurement) numerical value vector C of monitored amount ⁱ" " the initial value of monitored amount vector C together ⁱ _o", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" and " current nominal virtual lesion vector d ⁱ _c" linear approximate relationship (seeing formula (9)) that exists between (the current nominal virtual lesion amount by all ropes is formed), calculate the current nominal virtual lesion vector d of cable system according to multi-objective optimization algorithm ⁱ _cNoninferior solution.Obtain current actual virtual lesion vector d according to formula (17) then ⁱ

5. data systematic function: can regularly or by the personnel operation health monitoring systems generate cable system health condition form.

6. warning function.Under specified requirements, automatically the operation communication panalarm is reported to the police to personnel such as monitoring, so that the related personnel takes the necessary measures, for example notify the related personnel that the problematic support cable that identifies is differentiated, identify damaged cable and slack line (concrete grammar was introduced in the 11 step).

7. calculate the relax level of support cable equivalence according to the actual virtual lesion degree of support cable.

The 11 step: because current actual virtual lesion vector d ⁱElement numerical value represent the virtual lesion degree of corresponding rope, so it is impaired or relaxed and possible degree of injury or relax level just to define which Suo Keneng according to current actual virtual lesion vector, but damage has taken place actually or has taken place to relax in these ropes, need differentiate.The method of differentiating is varied; can be by removing the protective seam of support cable; support cable is carried out visual discriminating; perhaps carry out visual discriminating by optical imaging apparatus; also can be by lossless detection method to support cable impaired discriminating the whether, UT (Ultrasonic Testing) is exactly a kind of present widely used lossless detection method.Those do not find to damage and the virtual lesion degree is not that 0 support cable is exactly that lax rope has taken place to differentiate the back, need adjust the rope of Suo Li exactly, can be finished the finding the solution of relax level (being the long adjustment amount of rope) of slack line by software.

The 12 step:, promptly try to achieve current nominal virtual lesion vector d in the i time circulation in this circulation ⁱ _cAfter, at first, set up mark vector B according to formula (26), formula (27) ⁱ

The 13 step: if mark vector B ⁱElement be 0 entirely, then got back to for the tenth step and continue this circulation; If mark vector B ⁱElement be not 0 entirely, then enter next step, i.e. the 14 step.

The 14 step: according to the initial virtual lesion vector d that formula (28) calculates next time, i.e. the i+1 time circulation is required ^I+1 _oEach element d ^I+1 _Oj

The 15 step: at Mechanics Calculation benchmark model A ⁱThe basis on, the health status that makes rope is the vectorial d that previous step calculates ^I+1 _oAfter, obtain new Mechanics Calculation benchmark model, next time promptly the required Mechanics Calculation benchmark model A of (the i+1 time) circulation ^I+1

The 16 step: by to Mechanics Calculation benchmark model A ^I+1Calculate corresponding to model A ^I+1The numerical value of all monitored amounts of structure, these numerical value are formed next time, required vectorial C promptly circulates for the i+1 time ^I+1 _o, i.e. the initial value vector of monitored amount.

The 17 step: got back to for the 7th step, beginning is circulation next time.

Claims (2)

1. progressive health monitoring method based on the lax support cable of the identification of angle monitor is characterized in that this method comprises:

A. establish total N root rope, at first determine the coding rule of rope, with rope numberings all in the Cable Structure, this numbering will be used to generate the vector sum matrix in subsequent step by this rule;

B. determine the monitored point of appointment, give all specified point numberings; Determine the monitored straight line of each monitoring point, gave the monitored straight line numbering of all appointments; Determine the monitored angle coordinate component of each monitored straight line, give all monitored angle coordinate component numberings, " monitored angle coordinate component numbering " will be used to generate the vector sum matrix in subsequent step, " the whole monitored angle-data of structure " is made up of above-mentioned all measured angle coordinate components, " the monitored angle-data of structure " abbreviated as " monitored amount ", and the quantity of monitored point must not be less than the quantity of rope; The quantity sum of all monitored strains must not be less than the quantity of rope;

C. the data of utilizing the Non-Destructive Testing data etc. of rope can express the health status of rope are set up initial virtual lesion vector d ⁱ _o, wherein i represents cycle index, i=1, and 2,3 ...; Circulation time d for the first time ⁱ _oBe designated as d ¹ _oIf when not having the data of the Non-Destructive Testing data of rope and other health status that can express rope, can think perhaps that the structure original state is lax for not having, during the not damaged state, vectorial d ¹ _oEach element numerical value get 0;

D. setting up initial virtual lesion vector d ¹ _oThe time, directly measurement calculates the initial value of all monitored amounts of Cable Structure, forms the initial value vector C of monitored amount ⁱ _o

E. setting up initial virtual lesion vector d ¹ _oInitial value vector C with monitored amount ¹ _oThe time, directly measure the initial Suo Li that calculates all support cables, form initial rope force vector F _oSimultaneously, obtain the initial drift of all support cables, form initial drift vector l according to structural design data, completion data _oSimultaneously, obtain the initial geometric data of Cable Structure according to structural design data, completion data or actual measurement; Simultaneously, survey or obtain elastic modulus, density or the initial cross sectional area of all ropes according to structural design, completion information;

F. according to the above-mentioned measured data of design drawing, as-constructed drawing and the Cable Structure of Cable Structure, set up the mechanics model of Cable Structure, computational data based on this Model Calculation gained is approaching more good more with above-mentioned measured data, and this moment, this model was called as the Mechanics Calculation benchmark model A of structure ¹, A ¹The health status of corresponding rope is by d ¹ _oDescribe;

G. at Mechanics Calculation benchmark model A ⁱThe basis on carry out the several times Mechanics Calculation, by calculate obtaining " nominal virtual unit damage vector D ⁱ _u" and " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ", wherein i represents cycle index, i=1, and 2,3 ...; A ⁱThe health status of corresponding rope is by d ⁱ _oDescribe;

H. actual measurement obtains the current cable power of all support cables of Cable Structure, forms current cable force vector F ⁱSimultaneously, actual measurement obtain Cable Structure all specify the current measured value of monitored amount, form " the current numerical value vector C of monitored amount ⁱ", actual measurement calculates the horizontal range of two supporting end points of all support cables; When numbering to the element of the institute's directed quantity that occurred before this step and this step, should use same coding rule, each vector that can guarantee before this step and this step like this and occur afterwards, number identical element, represent same monitored amount, corresponding to vectorial defined relevant information under this element;

I. define current nominal virtual lesion vector d to be asked ⁱ _cWith current actual virtual lesion vector d ⁱ, damage vectorial d ¹ _o, d ⁱ _cAnd d ⁱElement number equal the quantity of rope, be one-to-one relationship between the element of damage vector and the rope, the element numerical value of damage vector is represented the virtual lesion degree or the health status of corresponding rope;

J. according to " the current numerical value vector C of monitored amount ⁱ" " the initial value of monitored amount vector C together ⁱ _o", " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" and " current nominal virtual lesion vector d ⁱ _c" between the linear approximate relationship that exists, this linear approximate relationship can be expressed as formula 1, removes d in the formula 1 ⁱ _cOther outer amount is known, finds the solution formula 1 and just can calculate current nominal virtual lesion vector d ⁱ _c

Formula 1

K. the current actual virtual lesion vector d that utilizes formula 2 to express ⁱElement d ⁱ _jWith initial virtual lesion vector d ⁱ _oElement d ⁱ _OjWith current nominal virtual lesion vector d ⁱ _cElement d ⁱ _CjBetween relation, calculate current actual virtual lesion vector d ⁱAll elements;

Formula 2

J=1 in the formula 2,2,3 ..., N;

Because current actual virtual lesion vector d ⁱElement numerical value represent the current actual virtual lesion degree of corresponding rope, promptly actual relax level or actual damage degree, current actual virtual lesion vector d ⁱIn numerical value be not that the support cable of 0 element correspondence is exactly problematic support cable, problematic support cable may be slack line, also may be damaged cable, its numerical response the degree of lax or damage;

L. identify damaged cable from the problematic support cable that k identified the step, remaining is exactly slack line;

M. utilize the current actual virtual lesion vector d that obtains in the k step ⁱObtain the current actual virtual lesion degree of slack line, utilize the current cable force vector F that obtains in the h step ⁱ, utilize two horizontal ranges that support end points in all support cables of h step acquisition, utilize the vectorial l of the initial drift that obtains in the e step _oUtilization is in elastic modulus, density or the initial cross sectional area data of all ropes of e step acquisition, by with slack line with damaged cable carry out the mechanics equivalence calculate slack line, with the relax level of current actual virtual lesion degree equivalence, the mechanical condition of equivalence is: one, the mechanics parameters of lax initial drift, geometrical property parameter, density and the material during with not damaged of the nothing of the rope of two equivalences is identical; Two, after the lax or damage, the Suo Li of the slack line of two equivalences and damage rope be out of shape after length overall identical; When satisfying above-mentioned two equivalent conditions, the such mechanics function of two support cables in structure is exactly identical, if after promptly replacing damaged cable with the slack line of equivalence, Cable Structure any variation can not take place, vice versa; Try to achieve the relax level that those are judged as slack line according to aforementioned mechanics equivalent condition, relax level is exactly the change amount of support cable drift, just determined the long adjustment amount of rope of the support cable that those need adjust Suo Li, so just realized the lax identification and the damage identification of support cable, institute's demand power is by current cable force vector F during calculating ⁱCorresponding element provides;

N. try to achieve current nominal virtual lesion vector d ⁱ _cAfter, set up mark vector B according to formula 3 ⁱ, formula 4 has provided mark vector B ⁱThe definition of j element;

Formula 3

Formula 4

Element B in formula 3, the formula 4 ⁱ _jBe mark vector B ⁱJ element, D ⁱ _UjBe nominal virtual unit damage vector D ⁱ _uJ element, d ⁱ _CjBe current nominal virtual lesion vector d ⁱ _cJ element, they all represent the relevant information of j root rope; J=1 in formula 3, the formula 4,2,3 ..., N;

If mark vector B o. ⁱElement be 0 entirely, then get back to h step and continue this circulation; If mark vector B ⁱElement be not 0 entirely, then enter next step, i.e. p step;

P. according to formula 5 calculate next time, i.e. the required initial virtual lesion vector d of the i+1 time circulation ^I+1 _oEach element d ^I+1 _Oj

Formula 5

D in the formula 5 ⁱ _UjBe the nominal virtual unit damage vector of the i time circulation D ⁱ _uJ element, d ⁱ _CjBe the current nominal virtual lesion vector d of the i time circulation ⁱ _cJ element, B ⁱ _jBe the i time circulation mark vector B ⁱJ element; J=1 in the formula 5,2,3 ..., N;

Q. at Mechanics Calculation benchmark model A ⁱThe basis on, the health status that makes rope is d ^I+1 _oThe back renewal obtains next time, required Mechanics Calculation benchmark model A promptly circulates for the i+1 time ^I+1

R. pass through Mechanics Calculation benchmark model A ^I+1Calculate corresponding to model A ^I+1The numerical value of all monitored amounts of structure, these numerical value are formed next time, the vectorial C of initial value of the required monitored amount that promptly circulates for the i+1 time ^I+1 _o

S. get back to the g step, beginning is circulation next time.

2. the progressive health monitoring method based on the lax support cable of the identification of angle monitor according to claim 1 is characterized in that in step g, obtains " nominal virtual unit damage vector D ⁱ _u" and " the monitored numerical quantity transformation matrices of virtual unit damage Δ C ⁱ" method be:

G1. at the Mechanics Calculation benchmark model A of structure ⁱThe basis on carry out the several times Mechanics Calculation, equal the quantity of all ropes on the calculation times numerical value, there is N root rope that N calculating is just arranged, calculating each time in the hypothesis cable system has only a rope to increase virtual unit damage again on the basis of original virtual lesion, the rope that occurs virtual unit damage in calculating each time is different from the rope that occurs virtual unit damage in other time calculating, and supposition each time has the virtual unit damage value of the rope of virtual unit damage can be different from the virtual unit damage value of other ropes, uses " nominal virtual unit damage vector D ⁱ _u" write down the unit damage of the supposition of all ropes, calculate the current numerical value of all monitored amounts each time, the current numerical value of the monitored amount of all that calculate is formed one " the current numerical value vector of the calculating of monitored amount " each time; When hypothesis j root rope has unit damage, available C ⁱ _Tj" the current evaluation vector C of monitored amount that expression is corresponding ⁱ _Tj"; when giving each vectorial element numbering in this step; should use same coding rule with other vector among the present invention; can guarantee any one element in each vector in this step like this;, expressed the relevant information of same monitored amount or same target with element in other vector, that numbering is identical;

G2. that calculates each time " the current evaluation vector C of monitored amount ⁱ _Tj" deduct " initial value of monitored amount vector C ⁱ _o" obtain a vector, during all calculating divided by this, each element that again should vector obtains one " the numerical value change vector of monitored amount " after the virtual unit damage value of supposition; There is N root rope that N " the numerical value change vector of monitored amount " just arranged;

G3. form " the monitored numerical quantity transformation matrices of the virtual unit damage Δ C that the N row are arranged successively by this N " the numerical value change vector of monitored amount " ⁱ", the coding rule of the row of " the monitored numerical quantity transformation matrices of virtual unit damage " and current nominal virtual lesion vector d ⁱ _cWith current actual virtual lesion vector d ⁱThe element coding rule identical.