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Bolt loosening analysis and diagnosis by non-contact laser excitation vibration tests

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Title: Bolt loosening analysis and diagnosis by non-contact laser excitation vibration tests
Authors: Huda, Feblil Browse this author
Kajiwara, Itsuro Browse this author →KAKEN DB
Hosoya, Naoki Browse this author
Kawamura, Shozo Browse this author
Keywords: Bolt loosening
Laser excitation
Finite element model
High frequency response
Fault diagnosis
RT method
Issue Date: Nov-2013
Publisher: Academic press ltd- elsevier science ltd
Journal Title: Mechanical systems and signal processing
Volume: 40
Issue: 2
Start Page: 589
End Page: 604
Publisher DOI: 10.1016/j.ymssp.2013.05.023
Abstract: In this paper, a vibration testing and health monitoring system based on an impulse response excited by laser ablation is proposed to detect bolted joint loosening. A high power Nd: YAG pulse laser is used to generate an ideal impulse on a structural surface which offers the potential to measure high frequency vibration responses on the structure. A health monitoring apparatus is developed with this vibration testing system and a damage detecting algorithm. The joint loosening can be estimated by detecting fluctuations of the high frequency response with the health monitoring system. Additionally, a finite element model of bolted joints is proposed by using three-dimensional elements with a pretension force applied and with contact between components taken into account to support the bolt loosening detection method. Frequency responses obtained from the finite element analysis and the experiments using the laser excitation are in good agreement. The bolt loosening can be detected and identified by introducing a damage index by statistical evaluations of the frequency response data using the Recognition-Taguchi method. The effectiveness of the present approach is verified by simulations and experimental results, which are able to detect and identify loose bolt positions in a six-bolt joint cantilever. (C) 2013 Elsevier Ltd. All rights reserved.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 梶原 逸朗

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