Large-damping engineering structure modal parameter identification method

A technology of modal parameter identification and engineering structure, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that the independent component analysis method cannot accurately identify the modal parameters of large damping structures, and achieve good anti-noise sexual effect

Inactive Publication Date: 2017-06-13
DALIAN UNIV OF TECH +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for identifying the modal parameters of large damping engineering structures to solve the problem that the independent component analysis method cannot accurately identify the modal parameters of large damping structures

Method used

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  • Large-damping engineering structure modal parameter identification method
  • Large-damping engineering structure modal parameter identification method
  • Large-damping engineering structure modal parameter identification method

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Embodiment Construction

[0028] The embodiments of the present invention are further explained below in conjunction with the technical solutions.

[0029] Take a 3-layer frame structure, the mass of the first layer is 3kg, the mass of the second layer is 1kg, the mass of the third layer is 2kg, the stiffness of the first layer is 2kN / m, the stiffness of the second layer and the third layer are equal is 1kN / m, the damping ratio adopts Rayleigh damping C=αM+βK, where α=0.05, β=0.004, the excitation adopts white noise random excitation, the noise level is 10% of the actual signal variance, and the sampling frequency is 10Hz. The signal is the acceleration at each layer position of the 3-layer frame.

[0030] The specific implementation is as follows:

[0031] (1) Sampling obtains the vibration acceleration y(t)=[y of the three-layer frame structure 1 (t),y 2 (t),y 3 (t)] T , select the response y of the third layer 3 (t) is used as a reference signal to obtain the cross-correlation function matrix ...

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Abstract

The invention belongs to the field of structural health monitoring and mainly relates to a large-damping engineering structure modal parameter identification method. Cross-correlation function responded by structure vibration under random excitation is converted into a frequency domain, a real part or a virtual part of available frequency domain data are subjected to independent component analysis to acquire modal vibration model and modal response, rough modal frequency and damping ratio of modal responses of each order are calculated by adopting fast Fourier transform and a half-power bandwidth method, the rough modal frequency and the damping ratio are taken as initial values for fitting modal response curves to have the modal responses of each order fitted by adopting a least squares iterative estimation, and accurate values of the modal frequency of the each order and the damping ratio can be finally acquired. By the arrangement, independence assumption in independent component analysis of the processed data can be met, and the modal parameters with the large-damping structure can be accurately identified.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, and relates to an engineering structure modal parameter identification method, in particular to a large damping engineering structure modal parameter identification method. Background technique [0002] The identification of modal parameters of engineering structures plays an important role in structural health monitoring. Accurate identification of structural modal parameters (frequency, mode shape and damping ratio) is particularly important for structural damage identification and performance evaluation. The modal parameter identification methods of engineering structures are mainly divided into three categories: time domain, frequency domain and time-frequency domain. The independent component analysis method is a time-domain signal processing method newly proposed in recent years, and has been successfully applied to the identification of the modal parameters of the stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 伊廷华姚小俊李宏男马树伟
Owner DALIAN UNIV OF TECH
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