基于VMD和Chirplet变换的结构损伤识别研究

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Abstract In order to identify damage location and quantify damage degree, a structural damage detection method based on variational mode decomposition (VMD) and Chirplet transform was proposed. VMD was used to decompose structural vibration response signal to obtain modal components, and then Chirplet transform was applied for time-frequency analysis of the modal components. The energy index of modal component Chirplet transform was constructed for damage location identification, and the Chirplet transform time-frequency entropy was defined to quantify the degree of structural damage. The proposed method was verified by a numerical example of a simply supported beam with varied stiffness. The results show that the proposed method can accurately identify the damage location and quantify the damage degree of the structure regardless of single point damage or multi-point damage.

Key words： variational mode decomposition Chirplet transform damage detection time-frequency entropy damage quantification

Received: 28 March 2022 Published: 28 April 2023

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	Articles by authors
	ZHANG Jian1
	CHENG Xueli1
	YUAN Pingping2
	DUAN Minglei3
	REN Weixin4

Cite this article:

ZHANG Jian1,CHENG Xueli1,YUAN Pingping2, et al. Structural damage detection based on variational mode decomposition and the Chirplet transform[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(8): 282-288.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I8/282

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