基于时变模态振型小波变换的结构损伤识别方法

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Abstract

Structural damage leads to the change of structural modal parameters, so the damage status can be identified by time-varying modal mode shape.First, by wavelet transformation of response signals, wavelet scale parameters were extracted according to the local maximum value of wavelet coefficients modulus.The instantaneous frequency of a time-varying structure was estimated from the wavelet scale parameter.Afterwards, a specific scale was selected and the signal of each node of the structure was decoupled into a single mode by wavelet transformation with the specific scale parameter, and the instantaneous mode shape of the structure was obtained by normalizing the ratio of the wavelet coefficients.Finally, the wavelet transformation was applied to the variance of mode shape on a small scale.The existence time and position of damage were identified by the local maximum value of the real part of the wavelet coefficients.The damage extent was identified by the maximum value of the real part of wavelet coefficients.The proposed method was applied to a cantilever beam and a cable-stayed bridge.It was approved that the wavelet transformation on the time-varying modal mode shape method can not only identify the existence time of damage, but also identify the damage position and damage extent of structures with high accuracy and efficiency.

Key words： modal mode shape damage condition wavelet transformation scale parameter

Received: 14 April 2020 Published: 28 August 2021

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	Articles by authors
	WANG Meng
	WENG Shun
	YU Xingsheng
	YAN Junfeng
	YIN Pengcheng

Cite this article:

WANG Meng,WENG Shun,YU Xingsheng, et al. Structural damage identification based on time-varying modal mode shape of wavelet transformation[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(16): 10-19.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I16/10

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