Detection of bolt looseness in frame structures using empirical mode decomposition

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (8) : 201-206.

Wenqiang Zhou, li Xiao, Wenzhong Qu

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Abstract

Bolt looseness is a nonlinear damage which would result in the occurrence of modulation between excitation frequency and natural frequencies by a combination of low and high frequency excitations. Using the vibration modulation, this paper develops a vibration-based method for detecting bolt looseness based on empirical mode decomposition (EMD).The response signal is analyzed for nonlinear modulation in frequency domain. Then, using the high-frequency intrinsic mode functions which contain the frequency modulation component based on EMD, an effective energy-based damage index is established to detect the presence of the nonlinear damage, with the analysis of energy distribution. A four-story frame structure vibration testing is carried out to investigate the feasibility of the method. The result of experiments demonstrates that modulation is occurred in the high-frequency component of response signals; the proposed energy-based damage index can be used to accurately detect nonlinear damage caused by bolt looseness and is sensitive to the structural early damage.

Key words

Bolt Looseness / Damage Detection / Empirical Mode Decomposition / Energy Damage Index / Modulation

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Wenqiang Zhou, li Xiao, Wenzhong Qu. Detection of bolt looseness in frame structures using empirical mode decomposition[J]. Journal of Vibration and Shock, 2016, 35(8): 201-206

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