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Structural damping ratio identification method based on unknown pulse excitation response

A technology of structural damping and identification method, which is applied in the testing of machines/structural components, testing of mechanical components, vibration testing, etc. It can solve problems such as inaccurate identification of damping ratios, achieve good anti-noise performance, and improve the effect of identification accuracy

Active Publication Date: 2022-04-15
DALIAN UNIV OF TECH +1
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AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a method for identifying the damping ratio of a structure under unknown pulse excitation, which solves the problem of inaccurate identification of the damping ratio due to truncation errors in the Frequency Domain Decomposition (FDD) method

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  • Structural damping ratio identification method based on unknown pulse excitation response
  • Structural damping ratio identification method based on unknown pulse excitation response
  • Structural damping ratio identification method based on unknown pulse excitation response

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Embodiment Construction

[0024] The embodiments of the present invention are further explained below in conjunction with the technical solutions.

[0025] Taking a 3-degree-of-freedom structure as an example, assuming that the mass of each degree of freedom is 1kg, 1.5kg, and 2kg respectively, its stiffness matrix and damping matrix are as follows:

[0026]

[0027]

[0028] The excitation form is the unit impulse response, and the response signal is the displacement of each layer of the structure.

[0029] (1) Obtain the displacement response of the structure y=[y 1 (t),y 2 (t),y 3 (t)...y n (t)], use the displacement response to obtain its correlation function, perform Fourier transform on the correlation function to obtain the power spectral density function, and then obtain the power spectral density function matrix On the diagonal is the autopower spectral density function of each degree of freedom, and on the off-diagonal is the cross-spectral density function between different degree...

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Abstract

The invention belongs to the technical field of engineering structure detection data analysis, and provides an unknown pulse excitation response-based structure damping ratio identification method, which comprises the following steps of: applying pulse excitation to a structure to obtain an output power spectrum matrix of the structure, and performing singular value decomposition on an output power spectrum function to obtain modal parameters such as a vibration mode and the like; then, a correction term is obtained through calculation according to modal parameters obtained through decomposition and damping correction parameters, and the output power spectrum is corrected; and determining a value of a damping correction parameter through the corrected vibration mode, and substituting the value of the damping correction parameter into a maximum singular value formula for iteration to obtain a structural damping ratio. According to the method, the damping ratio of the structure is obtained through the frequency domain, the problem that the damping ratio identification error is large due to the truncation error of FDD is solved, and the identification precision of the damping ratio is improved.

Description

technical field [0001] The invention belongs to the technical field of engineering structure detection data analysis, and relates to a structural damping ratio identification method based on an unknown impulse excitation response. Background technique [0002] Engineering structure detection is an important means to regularly maintain structures and ensure structural safety, and modal parameters reflect the dynamic characteristics of structures and can be used to evaluate structural performance. Therefore, it is very important to use structural detection data to identify structural modal parameters. [0003] The modal parameters of the structure include frequency, mode shape, and damping ratio. Damping can dissipate the energy of the vibrating system over time. In actual engineering, damping not only helps to reduce the amplitude of structural resonance, but also prevents the structure from reacting due to dynamics. The ultimate stress is destroyed, and it helps to quickly r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01M7/02G01H11/06G06F17/15
Inventor 曲春绪伊廷华刘宇飞李宏男马树伟
Owner DALIAN UNIV OF TECH
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