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Structural damage warning method based on confidence of principle component of vibration transmissibility function

A technology of vibration transmissibility and function principal components, applied in the field of structural damage identification, can solve problems such as misjudgment, and achieve the effects of strong operability, small amount of calculation, and improved processing accuracy

Inactive Publication Date: 2014-01-22
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

[0003] At present, many structural damage early warning methods have been researched and proposed. Among them, the structural damage early warning method based on vibration response analysis does not need to measure the excitation, and only uses the structural response to evaluate the structural state, which is closer to the actual situation. Therefore, it is considered to be a However, due to the influence of excitation amplitude and noise, the structural damage early warning method based on vibration response analysis is prone to misjudgment.

Method used

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  • Structural damage warning method based on confidence of principle component of vibration transmissibility function
  • Structural damage warning method based on confidence of principle component of vibration transmissibility function
  • Structural damage warning method based on confidence of principle component of vibration transmissibility function

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Embodiment 1

[0035] A structural damage early warning method based on the confidence of the principal components of the vibration transmissibility function, the flow chart is shown in figure 1 ,Specific steps are as follows:

[0036] Step 1: Obtain the acceleration response signals of some measuring points before and after the structural damage, and calculate the vibration transmissibility function by Fourier transform:

[0037] T ij ( ω ) = A i ( ω ) A j ( ω ) - - - ( 1 )

[0038] In the formula, A i...

Embodiment 2

[0054] The 3D finite element model of the seven-storey ocean platform is established by using ANSYS, and the basic parameters: the elastic modulus is E=2.07×10 11 N / m 2 , the density is 7800Kg / m 3 , Poisson's ratio μ=0.3. Columns, beams and supports use BEAM4 unit, the roof uses SHELL63 unit, and the stacked mass on the roof uses MASS21 unit for simulation. The model has a total of 44 nodes, 264 degrees of freedom, 92 BEAM4 units, 1 SHELL3 unit, 4 MASS21 units, 7 unit section types, and the offshore platform is fixed to the foundation. to simulate structural damage. model such as figure 2 , image 3 shown. During the numerical simulation, the Y-direction plane 26 is taken for analysis. The excitation is Gaussian white noise with a sampling frequency of 1000Hz and a duration of 49.152 seconds, applied at 14 points. Using the transient analysis module of ANSYS10.0, the accelerations (Y-axis direction) of points 15 and 19 before and after structural damage were calculate...

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Abstract

The invention relates to the field of structural damage identification, in particular to a structural damage warning method based on confidence of the principle component of a vibration transmissibility function. The transmissibility function is constructed by using accelerated speed response, the transmissibility function is free of the influence of excitation amplitude, and the structural damage warning can be free of the influence of the excitation amplitude by taking the amplitude of the transmissibility function as analysis signals; the principle component of the vibration transmissibility function is extracted through the analysis of the principle component, correlation analysis is carried out on the principle component, the confidence of the principle component is computed according to the modal confidence criteria, evaluation is carried out on structural states by using the confidence of the principle component, and the influence of noise can be restrained or eliminated. The structural damage warning method based on the confidence of the principle component of the vibration transmissibility function is free of the influence of the excitation amplitude, capable of effectively restraining or eliminating the influence of noise, small in computing amount, extremely suitable for online monitoring, and strong in operability, and improves processing precision and warning accuracy.

Description

technical field [0001] The invention relates to the field of structural damage identification, in particular to a structural damage early warning method based on the confidence degree of the principal component of the vibration transmissibility function. Background technique [0002] Due to the effect of load and the influence of the environment, civil engineering structures will be damaged to varying degrees during service. If they are not detected and taken measures in time, it will bring catastrophic consequences. Therefore, it is necessary to carry out damage identification research on structures. Structural damage identification is divided into four levels, namely, damage early warning (judgment of the existence of structural damage), determination of damage location, determination of damage degree, and structural life prediction, and damage early warning is the most critical. [0003] At present, many structural damage early warning methods have been researched and pro...

Claims

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Application Information

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IPC IPC(8): G06F17/14
Inventor 刁延松陈家宝任红孙玉婷曹亚东华盼盼徐东锋
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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