CN108020562A - Space roof truss damage detecting method and system - Google Patents
Space roof truss damage detecting method and system Download PDFInfo
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- CN108020562A CN108020562A CN201711255581.3A CN201711255581A CN108020562A CN 108020562 A CN108020562 A CN 108020562A CN 201711255581 A CN201711255581 A CN 201711255581A CN 108020562 A CN108020562 A CN 108020562A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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Abstract
The present invention relates to a kind of space roof truss damage detecting method and system, including fixed installation laser emitter and laser pickoff；The laser emitter is launched to destination node；The laser pickoff receives the reflected light of the destination node；The vibration shape information of destination node is obtained according to the reflected light；Whether the quantity for the vibration shape information for judging to collect reaches preset requirement, if it is, continuing next step, otherwise continues to gather；The impairment parameter of space roof truss each unit is calculated in the low order natural mode of vibration vibrated according to the space roof truss.The present invention will not change the topological structure of structural model using dynamic data collection system is installed；By converting dynamic data collection system position, it is convenient to obtain enough vibration shape information to meet the needs of damage check, overcome the defects of existing method vibration shape information content is insufficient, and the accuracy detected is higher.
Description
Technical field
The present invention relates to structure detection technical field, more particularly to structural damage detection technical field, in particular to one kind
Space roof truss damage detecting method and system.
Background technology
Space roof truss structure extensive use in many industry and civil buildings, such as tower crane, power transmission tower frame, space roof truss bridge
Beam etc..Due to the use of the growth of the time limit, and the influence of environmental corrosion, Hazard Loads etc., space roof truss structure will be inevitable
Damage, it is necessary to detection promptly and accurately is made to the damage status in structure, in order to averting a calamity property of maintenance and reinforcement
Consequence occur.
Traditional damage vibration shape detector or device, are all to utilize visual local experimental method, such as ultrasonic wave side mostly
Method, methods of magnetic field, temperature field method and all kinds of devices using this method etc..But the above method or device, exist as follows
Defect：First, it is desirable to probably know damage position in advance；Secondly, it is desirable to which detection site equipment can reach.Therefore prejudge
Property it is poor, heavy workload expends high, and is not suitable for the damage check of large scale civil engineering structure.
It is a kind of current new skill using the method changed to judge its damage status of space roof truss Vibration Parameters
Art.This technology is by the vibration parameters before and after gathering structural damage, and the finite element model of integrated structure is to judge structure
It is no to damage, the position of damage and degree.
Wherein, the key link that vibration parameters as much as possible are above-mentioned new detection techniques is gathered.In general, space roof truss knot
The measurement of the vibration parameters of structure is only needed to arrange measuring point and can carried out, and easily operated and precision is very high；The measurement of the vibration shape more can
The actual state of reaction compartment roof truss structure.Therefore, the vibration shape becomes the parameter to be used in damage check.But current engineering
Practice in the prior art, can only collect a few low order mode parameter, cannot meet space roof truss knot in many cases
The needs of structure damage check.
The content of the invention
It is of the prior art its object is to overcome the present invention provides a kind of space roof truss damage detecting method and system
Defect, experimental implementation are simple, of low cost, in that context it may be convenient to obtain enough vibration shape information and be used for space roof truss structure
Damage check, and the accuracy detected is higher.
To achieve these goals, the present invention has following form：
The embodiment of the present invention provides a kind of space roof truss damage detecting method, includes the following steps：
(1) laser emitter and laser pickoff is fixedly mounted；
(2) laser emitter is launched to destination node；
(3) laser pickoff receives the reflected light of the destination node；
(4) vibration shape information of destination node is obtained according to the reflected light；
(5) whether the quantity for the vibration shape information for judging to collect reaches preset requirement, if it is, continue step (6), it is no
Then continue step (2)；
(6) the damage ginseng of space roof truss each unit is calculated in the low order natural mode of vibration vibrated according to the space roof truss
Number.
Alternatively, the step (4), includes the following steps：
The optical signal that the laser pickoff receives is converted into electric signal, the electric signal forms vibration shape information.
Alternatively, the step (6) includes the following steps：
The low order natural mode of vibration that (6-1) vibrates the space roof truss carries out sensitivity analysis, obtains space roof truss structure
Rigidity relational matrix；
(6-2) represents the residual force equation of space roof truss structure in the form of rigidity relational matrix；
In the residual force equation that the vibration shape information input that (6-3) obtains measurement is represented in the form of rigidity relational matrix, meter
Calculation obtains the impairment parameter of space roof truss each unit.
Alternatively, the step (6-1) includes the following steps：
(6-1-1) sets up the finite element model of space roof truss to be detected using numerical analysis software；
(6-1-2) carries out sensitivity analysis to the finite element model, calculates the rigidity contact square of space roof truss structure
Stiffness variation matrix Δ K after battle array, the Bulk stiffness matrix K of space roof truss structure and damage can be expressed as formula：
K=APAT (1)
Δ K=A Δs PAT (2)
P=diag (k1,k2,…,kn)
Δ P=diag (Δ k1,Δk2,…,Δkn)
Wherein, P and Δ P is diagonal matrix；ki、ΔkiThe respectively axial rigidity of i-th rod piece of space roof truss structureAnd its knots modification, EiFor the elasticity modulus of rod piece, AiFor bar cross section area, liFor the length of rod piece；N is sky
Between roof truss structure rod piece sum；A be space roof truss structure rigidity relational matrix, A=a1,a2,…,an, wherein aiFor roof truss
The rigidity contact of i-th rod piece of space structure is vectorial, and rigidity relational matrix A is constant before and after space roof truss structural damage；
(6-1-3) formula (2) is unfolded, and obtains equation below：
ΔKij=[Ai1Aj1,Ai2Aj2,…,AinAjn][Δk1,Δk2,…,Δkn]T (3)
Equation below can obtain by the one order analysis of the stiffness matrix K of space roof truss structure：
Equation below (5) can be obtained by formula (3) and (4)：
All A are calculated by formula (5)ij, the rigidity relational matrix A of space roof truss structure is obtained, its i-th row aiFor
The rigidity contact vector of i-th rod piece of space roof truss structure.
Alternatively, the step (6-2) includes the following steps：
The space roof truss structure motion equation for ignoring damping is as follows
Its corresponding characteristic equation is as follows：
(K-λjM)φj=0 (7)
Wherein, K, M are respectively space roof truss structural stiffness matrix and mass matrix, λj、φjRespectively jth rank characteristic value and
Feature vector；
Space roof truss damaged structure formula is as follows：
Kd=Ku-ΔK (8)
Md=Mu-ΔM (9)
In formula, Ku、MuAnd Kd、MdRespectively damage before and after space roof truss structure stiffness matrix and mass matrix, Δ K and
Δ M is respectively the transformation matrices of space roof truss structural stiffness matrix and mass matrix；
Then for damaging space roof truss structure, meet equation below：
(Kd-λdjMd)φdj=0 (10)
λ in formuladj、φdjJth rank characteristic value and feature vector respectively after space roof truss structural damage, by formula (8)
(9) formula (10) is substituted into, arrangement obtains equation below：
(Ku-λdjMu)φdj=(Δ K- λdjΔM)φdj (11)
Rj=(Ku-λdjMu)φdj (12)
Equation below is obtained according to formula (11) and formula (12)：
(ΔK-λdjΔM)φdj=Rj (13)
Formula (13) for damage space roof truss structure dynamic residual vector equation, RjReferred to as jth rank dynamic residual vector.
Alternatively, △ M=0, simplified formula are equation below：
ΔKφdj=Rj (14)
Alternatively, the step (6-3), includes the following steps：
(6-3-1) formula (2) is unfolded, and obtains equation below：
Formula (15) is substituted into formula (14), obtains equation below：
According to formula (17) calculation formula (16), equation below is obtained：
Write formula (18) as matrix form, obtain equation below：
A γ=Rj (19)
Wherein, γ=[γ1,γ2,…,γn]T；
(6-3-2) for space roof truss structure, when rigidity of structure relational matrix A is square formation and full rank, according to formula (19)
γ is calculated；
Each bar unit axial rigidity knots modification Δ k is calculated according to formula (17) in (6-3-3)i(i=1,2 ..., n)；
(6-3-4) will measure the vibration shape information φ of gaineddjAs input parameter, space roof truss each unit impairment parameter is made
For output parameter, the damage position and degree of injury of space roof truss are judged according to output numerical value.
The embodiment of the present invention also provides a kind of space roof truss damage detection system, realizes the space roof truss damage check
Method, including：
Laser emitter, for launching to destination node；
Laser pickoff, for receiving the reflected light of the destination node；
Impairment parameter computing module, the optical signal for the laser pickoff to be received are converted into space roof truss vibration
Low order natural mode of vibration, and space roof truss each unit is calculated according to the low order natural mode of vibration that the space roof truss vibrates
Impairment parameter.
Space roof truss damage detecting method and the system in the invention are employed, is had the advantages that：
(1) topological structure of structural model will not be changed using dynamic data collection system is installed in the technical program；
(2) by converting dynamic data collection system position, it is convenient to obtain enough vibration shape information to meet to damage
The needs that triage is surveyed, overcome the defects of existing method vibration shape information content is insufficient；
(3) present invention has easy to operate, and dynamic data collection system can be reused；
(4) the technical program is used, the required simple implementation cost of equipment is low, and does not influence the normal work of space roof truss；
(5) enough vibration shape information can easily be obtained to meet the needs of damage check using the present invention, so that
Accuracy is higher；
(6) the space roof truss damage check program in the technical program is used, is detected simply, conveniently, and accuracy is higher.
Brief description of the drawings
Fig. 1 is the dynamic data collection system schematic diagram of the present invention.1 is laser emitter wherein in figure；2 be that laser inspection connects
Receive device；3 be measurement electric wire；4 be space roof truss node；5 be space roof truss rod piece；
Fig. 2 is a space roof truss model to be detected, wherein in figure S1-S10 be space roof truss node, T1-T25 be empty
Between roof truss rod piece.
Embodiment
In order to more clearly describe the technology contents of the present invention, carried out with reference to specific embodiment further
Description.
In order to solve the above-mentioned technical problem, an embodiment of the present invention provides a kind of space roof truss damage detection system, including：
Laser emitter, for launching laser to destination node；Laser pickoff, for receiving the reflected light of the destination node；Damage
Hinder parameter calculating module, the low order that the optical signal for the laser pickoff to be received is converted into space roof truss vibration is intrinsic
The vibration shape, and the impairment parameter of space roof truss each unit is calculated according to the low order natural mode of vibration that the space roof truss vibrates.
Wherein laser emitter and laser pickoff realize corresponding function based on dynamic data collection system.
Fig. 1 is the dynamic data collection system schematic diagram of the present invention.The dynamic data collection system includes one and swashs
If 1, laser detector 2 of optical transmitting set and dry measure electric wire 3.So as to which data acquisition is more convenient, accurate, and cost is low
It is honest and clean, and do not influence the normal work of space roof truss again；Avoid needing sensor being installed in engineering structure in prior art
Defect, easily implements, and can repeatedly use in different space roof truss structures.
Dynamic data collection system can be reused, and the simple implementation cost of equipment is low, and not influence the normal of space roof truss
Work, beneficial to convenient, accurate gathered data etc..Laser emitter 1 launches laser pulse by laser emitting diode.Swash
Photodetector 2 uses transducer receivers, can export vibration vibration shape information, and the equipment is commercially available.Measure electric wire
3 play each instrument of connection.
The present invention has easy to operate, and dynamic data collection system can be reused, and the simple implementation cost of equipment is low, and not
The advantages that influencing the normal work of space roof truss, enough vibration shape information can be obtained to meet the needs of damage check, and
Damage check result is accurately and reliably.
Based on above-mentioned space roof truss damage detection system, the embodiment of the present invention also provides a kind of space roof truss damage check side
Method, includes the following steps：
(1) laser emitter and laser pickoff is fixedly mounted；
(2) laser emitter is launched to destination node；
(3) laser pickoff receives the reflected light of the destination node；
(4) vibration shape information of destination node is obtained according to the reflected light, specifically, the laser pickoff is received
Optical signal is converted into electric signal, and the electric signal forms vibration shape information；
(5) whether the quantity for the vibration shape information for judging to collect reaches preset requirement, if it is, continue step (6), it is no
Then continue step (2)；
(6) the damage ginseng of space roof truss each unit is calculated in the low order natural mode of vibration vibrated according to the space roof truss
Number.
Fig. 2 is a plane space roof truss model to be detected, which is：Elastic modulus E=200GPa,
Density p=7.8 × 103Kg/m3, every rod length L=2m, rod piece cross section is square, cross-sectional area A=
0.04m2。
The step of carrying out damage check to the plane space roof truss shown in Fig. 2 using this case institute's extracting method is as follows：First, Gu
Dingan County installs dynamic data collection system (1+2+3)；Secondly, dynamic data collection system (1+2+3) is directed at structural object to be measured
Node is launched；3rd, the part light after structural object to be measured is reflected returns to dynamic data collection system (1+2+3)；The
Four, extremely faint optical signal is detected using dynamic data collection system (1+2+3), and be translated into corresponding electric signal；
5th, corresponding electric signal is converted into the low order natural mode of vibration of space roof truss vibration；6th, above procedure is repeated, until obtaining
Untill more vibration shape information that disclosure satisfy that damage check requirement.
In a preferred embodiment, the step (4) includes the following steps：
The optical signal that the laser pickoff receives is converted into electric signal by (4-1)；
The electric signal is converted into the low order natural mode of vibration of space roof truss vibration by (4-2).
In a preferred embodiment,
In a preferred embodiment, the step (6) includes the following steps：
The low order natural mode of vibration that (6-1) vibrates the space roof truss carries out sensitivity analysis, obtains space roof truss structure
Rigidity relational matrix；
(6-2) represents the residual force equation of space roof truss structure in the form of rigidity relational matrix；
In the residual force equation that the vibration shape information input that (6-3) obtains measurement is represented in the form of rigidity relational matrix, meter
Calculation obtains the impairment parameter of space roof truss each unit.
Alternatively, the step (6-1) includes the following steps：
(6-1-1) using numerical analysis software sets up the finite element model of space roof truss to be detected, and (model has represented
Good space roof truss structure)；
(6-1-2) carries out sensitivity analysis to the finite element model, calculates the rigidity contact square of space roof truss structure
Stiffness variation matrix Δ K after battle array, the Bulk stiffness matrix K of space roof truss structure and damage can be expressed as formula：
K=APAT (1)
Δ K=A Δs PAT (2)
P=diag (k1,k2,…,kn)
Δ P=diag (Δ k1,Δk2,…,Δkn)
Wherein, P and Δ P is diagonal matrix；ki、ΔkiThe respectively axial rigidity of i-th rod piece of space roof truss structureAnd its knots modification；N is the sum of space roof truss structural member；A is the rigidity relational matrix of space roof truss structure,
A=a1,a2,…,an, wherein aiIt is vectorial for the rigidity contact of i-th rod piece of roof truss space structure, before space roof truss structural damage
Rigidity relational matrix A is constant afterwards；
(6-1-3) formula (2) is unfolded, and obtains equation below：
ΔKij=[Ai1Aj1,Ai2Aj2,…,AinAjn][Δk1,Δk2,…,Δkn]T (3)
Equation below can obtain by the one order analysis of the stiffness matrix K of space roof truss structure：
Equation below (5) can be obtained by formula (3) and (4)：
All A are calculated by formula (5)ij, the rigidity relational matrix A of space roof truss structure is obtained, its i-th row aiFor
The rigidity contact vector of i-th rod piece of space roof truss structure.
In a preferred embodiment, the step (6-2) includes the following steps：
The space roof truss structure motion equation for ignoring damping is as follows
Its corresponding characteristic equation is as follows：
(K-λjM)φj=0 (7)
Wherein, K, M are respectively space roof truss structural stiffness matrix and mass matrix, λj, j be respectively jth rank characteristic value and
Feature vector.
Space roof truss damaged structure formula is as follows：
Kd=Ku-ΔK (8)
Md=Mu-ΔM (9)
In formula, Ku、MuAnd Kd、MdRespectively damage before and after space roof truss structure stiffness matrix and mass matrix, Δ K and
Δ M is respectively the transformation matrices of space roof truss structural stiffness matrix and mass matrix；
Then for damaging space roof truss structure, meet equation below：
(Kd-λdjMd)φdj=0 (10)
λ in formuladj、φdjJth rank characteristic value and feature vector respectively after space roof truss structural damage, by formula (8)
(9) formula (10) is substituted into, arrangement obtains equation below：
(Ku-λdjMu)φdj=(Δ K- λdjΔM)φdj (11)
Rj=(Ku-λdjMu)φdj (12)
Equation below is obtained according to formula (11) and formula (12)：
(ΔK-λdjΔM)φdj=Rj (13)
Formula (13) for damage space roof truss structure dynamic residual vector equation, RjReferred to as jth rank dynamic residual vector.
Under normal circumstances, space roof truss structural damage is mainly shown as the reduction of rigidity, and mass conservation, i.e. △ M=0,
Simplified formula is equation below：
ΔKφdj=Rj (14)
In a preferred embodiment, the step (6-3), includes the following steps：
(6-3-1) formula (2) is unfolded, and obtains equation below：
Formula (15) is substituted into formula (14), obtains equation below：
According to formula (17) calculation formula (16), equation below is obtained：
Write formula (18) as matrix form, obtain equation below：
A γ=Rj (19)
Wherein, γ=[γ1,γ2,…,γn]T；
(6-3-2) for space roof truss structure, when rigidity of structure relational matrix A is square formation and full rank, according to formula (19)
γ is calculated；
Each bar unit axial rigidity knots modification Δ k is calculated according to formula (17) in (6-3-3)i(i=1,2 ..., n).
Formula (19) can be obtained with direct solution.It can be obtained by formula (17) again, so as to identify the damage of space roof truss structure
Hinder rod piece and its degree of injury.
With above-mentioned formula and derivation, space roof truss damage check program can be worked out, the space room of gained will be measured
Frame vibrates low order mode, that is, vibration shape information (φdj) input parameter is used as, join space roof truss each unit impairment parameter as output
Number, you can the damage position and degree of injury of space roof truss are judged according to output numerical value.
Using the above scheme, first by the low order natural mode of vibration of dynamic data measuring system measurement space roof truss structure,
Finite element model progress sensitivity analysis is calculated to the rigidity relational matrix of space roof truss structure again, then by space roof truss
The residual force equation of structure is represented in the form of rigidity relational matrix, is finally inputted the vibration shape information for measuring gained and is joined with rigidity
It is the impairment parameter that space roof truss each unit is solved in the residual force equation that matrix form represents, the damage of gained will be calculated
Parameter output can make detection to the damage position and degree of space roof truss.The method that this case is carried, it is only necessary to a set of dynamic
Data measurin system, avoids the defects of existing method sensor will be installed in structure, easily operated implementation, and can obtain
Obtain more vibration shape information to be used in damage check, the accuracy of damage check can be increased substantially；Using the technical program
In space roof truss damage check program, detection is simple, conveniently, and accuracy is higher.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that it can still make
Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, specification and drawings are considered as illustrative
It is and nonrestrictive.
Claims (8)
1. a kind of space roof truss damage detecting method, it is characterised in that include the following steps：
(1) laser emitter and laser pickoff is fixedly mounted；
(2) laser emitter is launched to destination node；
(3) laser pickoff receives the reflected light of the destination node；
(4) vibration shape information of destination node is obtained according to the reflected light；
(5) judge whether the quantity of vibration shape information collected reaches preset requirement, if it is, continue step (6), otherwise after
Continuous step (2)；
(6) impairment parameter of space roof truss each unit is calculated in the low order natural mode of vibration vibrated according to the space roof truss.
2. space roof truss damage detecting method according to claim 1, it is characterised in that the step (4), including it is as follows
Step：
The optical signal that the laser pickoff receives is converted into electric signal, the electric signal forms vibration shape information.
3. space roof truss damage detecting method according to claim 1, it is characterised in that the step (6) includes as follows
Step：
The low order natural mode of vibration that (6-1) vibrates the space roof truss carries out sensitivity analysis, obtains the firm of space roof truss structure
Spend relational matrix；
(6-2) represents the residual force equation of space roof truss structure in the form of rigidity relational matrix；
In the residual force equation that the vibration shape information input that (6-3) obtains measurement is represented in the form of rigidity relational matrix, calculate
To the impairment parameter of space roof truss each unit.
4. space roof truss damage detecting method according to claim 3, it is characterised in that the step (6-1) is included such as
Lower step：
(6-1-1) sets up the finite element model of space roof truss to be detected using numerical analysis software；
(6-1-2) carries out sensitivity analysis to the finite element model, calculates the rigidity relational matrix of space roof truss structure, empty
Between roof truss structure Bulk stiffness matrix K and damage after stiffness variation matrix △ K can be expressed as formula：
K=APAT (1)
△ K=A △ PAT (2)
P=diag (k1,k2,…,kn)
△ P=diag (△ k1,△k2,…,△kn)
Wherein, P and △ P are diagonal matrix；ki、△kiThe respectively axial rigidity of i-th rod piece of space roof truss structureAnd its knots modification, EiFor the elasticity modulus of rod piece, AiFor bar cross section area, liFor the length of rod piece；N is space
The sum of roof truss structure rod piece；A be space roof truss structure rigidity relational matrix, A=a1,a2,…,an, wherein aiIt is empty for roof truss
Between i-th rod piece of structure rigidity contact vector, rigidity relational matrix A is constant before and after space roof truss structural damage；
(6-1-3) formula (2) is unfolded, and obtains equation below：
△Kij=[Ai1Aj1,Ai2Aj2,…,AinAjn][△k1,△k2,…,△kn]T (3)
Equation below can obtain by the one order analysis of the stiffness matrix K of space roof truss structure：
Equation below (5) can be obtained by formula (3) and (4)：
All A are calculated by formula (5)ij, the rigidity relational matrix A of space roof truss structure is obtained, its i-th row aiFor space
The rigidity contact vector of i-th rod piece of roof truss structure.
5. space roof truss damage detecting method according to claim 4, it is characterised in that the step (6-2) is included such as
Lower step：
The space roof truss structure motion equation for ignoring damping is as follows
Its corresponding characteristic equation is as follows：
(K-λjM)φj=0 (7)
Wherein, K, M are respectively space roof truss structural stiffness matrix and mass matrix, λj、φjRespectively jth rank characteristic value and feature
Vector；
Space roof truss damaged structure formula is as follows：
Kd=Ku-△K (8)
Md=Mu-△M (9)
In formula, Ku、MuAnd Kd、MdThe stiffness matrix and mass matrix of space roof truss structure before and after respectively damaging, M points of △ K and △
Not Wei space roof truss structural stiffness matrix and mass matrix transformation matrices；
Then for damaging space roof truss structure, meet equation below：
(Kd-λdjMd)φdj=0 (10)
λ in formuladj、φdjJth rank characteristic value and feature vector respectively after space roof truss structural damage, by formula (8) and (9)
Formula (10) is substituted into, arrangement obtains equation below：
(Ku-λdjMu)φdj=(△ K- λdj△M)φdj (11)
Rj=(Ku-λdjMu)φdj (12)
Equation below is obtained according to formula (11) and formula (12)：
(△K-λdj△M)φdj=Rj (13)
Formula (13) for damage space roof truss structure dynamic residual vector equation, RjReferred to as jth rank dynamic residual vector.
6. space roof truss damage detecting method according to claim 5, it is characterised in that △ M=0, simplified formula is such as
Lower formula：
△Kφdj=Rj (14) 。
7. space roof truss damage detecting method according to claim 5, it is characterised in that the step (6-3), including such as
Lower step：
(6-3-1) formula (2) is unfolded, and obtains equation below：
Formula (15) is substituted into formula (14), obtains equation below：
△kiai Tφdj=γi (17)
According to formula (17) calculation formula (16), equation below is obtained：
Write formula (18) as matrix form, obtain equation below：
A γ=Rj (19)
Wherein, γ=[γ1,γ2,…,γn]T；
(6-3-2) when rigidity of structure relational matrix A is square formation and full rank, is calculated for space roof truss structure according to formula (19)
Obtain γ；
Each bar unit axial rigidity knots modification △ k are calculated according to formula (17) in (6-3-3)i(i=1,2 ..., n)；
(6-3-4) will measure the vibration shape information φ of gaineddjAs input parameter, using space roof truss each unit impairment parameter as defeated
Go out parameter, the damage position and degree of injury of space roof truss are judged according to output numerical value.
8. a kind of space roof truss damage detection system, it is characterised in that realize the space any one of claim 1 to 7
Roof truss damage detecting method, including：
Laser emitter, for launching to destination node；
Laser pickoff, for receiving the reflected light of the destination node；
Impairment parameter computing module, the optical signal for the laser pickoff to be received are converted into the low order of space roof truss vibration
Natural mode of vibration, and according to the space roof truss vibrate low order natural mode of vibration be calculated space roof truss each unit damage join
Number.
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