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

Feblil Huda, Itsuro Kajiwara, Naoki Hosoya, Shozo Kawamura

研究成果: Article査読

92 被引用数 (Scopus)


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.

ジャーナルMechanical Systems and Signal Processing
出版ステータスPublished - 2013 11月

ASJC Scopus subject areas

  • 制御およびシステム工学
  • 信号処理
  • 土木構造工学
  • 航空宇宙工学
  • 機械工学
  • コンピュータ サイエンスの応用


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