基于广义Morse小波和EWT的移动荷载下结构时变频率识别

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Abstract A method based on the empirical wavelet transformation (EWT) and the generalized Morse wavelet was proposed to identify structural time-varying frequency under moving load. Firstly, EWT and the generalized Morse wavelet were introduced. Then a structural response signal was decomposed with EWT, the different empirical mode components decomposed were analyzed with the generalized Morse wavelet to extract signal wavelet ridges, and identify structural instantaneous frequency. Secondly, a numerical example was taken to verify the effectiveness and accuracy of the proposed method. Finally, a model test of a moving car passing through a steel plate beam was designed. The proposed method was adopted to recognize the structural time-varying frequency, and the identified results were compared with those calculated with the finite element method to further verify the effect of the proposed method.

Key words： empirical wavelet transformation (EWT) generalized Morse wavelet time-varying structure moving load instantaneous frequency

Received: 20 June 2018 Published: 28 December 2019

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	WANG Chao1
	2
	ZHU Hongping2

Cite this article:

WANG Chao1,2,ZHU Hongping2. Structural time-varying frequency identification under moving load based on generalized Morse wavelet and EWT[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(1): 24-28.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I1/24

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