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Application of subharmonic resonance for the detection of bolted joint looseness

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Abstract

Bolted joint structures are prone to bolt loosening under environmental and operational vibrations, which may severely affect the structural integrity. This paper presents a bolt looseness recognition method based on the subharmonic resonance analysis. The bolted joint structure was simplified to a two-degree-of-freedom nonlinear model, and a multiple timescale method was used to explain the phenomenon of the subharmonic resonance and conditions for the generation of subharmonics. Numerical simulation predictions for the generation of the subharmonics and conditions for the subharmonics can be found with respect to the excitation frequency and the excitation amplitude. Experiments were performed on a bolt-joint aluminum beam, where the damage was simulated by loosening the bolts. Two surface-bonded piezoelectric transducers were utilized to generate continuous sinusoidal excitation and to receive corresponding sensing signals. The experimental results demonstrated that subharmonic components would appear in the response spectrum when the bolted structure was subjected to the excitation of twice its natural frequency. This subharmonic resonance method was found to be effective on bolt looseness detection.

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Acknowledgements

Support from National Natural Science Foundation of China #51378402 and #51605284 is thankfully acknowledged.

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Correspondence to Wenzhong Qu.

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Zhang, M., Shen, Y., Xiao, L. et al. Application of subharmonic resonance for the detection of bolted joint looseness. Nonlinear Dyn 88, 1643–1653 (2017). https://doi.org/10.1007/s11071-017-3336-1

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  • DOI: https://doi.org/10.1007/s11071-017-3336-1

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