基于非线性阻尼识别的螺栓连接检测技术

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Abstract Bolt connection quality is the key factor to affect the mechanical structure assembly quality, so it’s important to explore a fast and effective technique for its detection.The definition of high order nonlinear damping ratio was proposed, and a formula for the identification of nonlinear damping on the bolted joints contact surfaces was provided according to the energy conservation law.The dynamic characteristics of the system were obtained through modal experiments, combined with which the empirical mode decomposition (EMD) was used to determine the frequency sensitive to the torsional vibration of the system.Impact response experiments of L-beams under different torques were carried out.The viscous damping ratio and nonlinear damping ratio of the system were identified by using the Hilbert transform and the established nonlinear damping identification formula.The results show that the change of bolt torque has a little effect on the natural frequencies of the system, but has obvious influence on the damping of the system, especially the viscous damping ratio.When the bolt is loose, the viscous damping ratio of the system will change significantly, that is, from 0.122 5 to 0.258 7, a relative increase of 111.18%, which verifies the effectiveness of the method proposed.

Key words： bolted joint nonlinear damping Hilbert transform empirical mode decomposition joint interfaces

Received: 16 November 2018 Published: 28 April 2020

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	Articles by authors
	AI Yanting
	LIU Chengming
	WANG Zhi
	TIAN Jing

Cite this article:

AI Yanting,LIU Chengming,WANG Zhi, et al. Technology for detecting bolted joints based on nonlinear damping identification[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(9): 138-143.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I9/138

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