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Damage detection in membrane structures using non-contact laser excitation and wavelet transformation

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Title: Damage detection in membrane structures using non-contact laser excitation and wavelet transformation
Authors: Huda, Feblil Browse this author
Kajiwara, Itsuro Browse this author →KAKEN DB
Hosoya, Naoki Browse this author
Keywords: Damage detection
Membrane structure
Laser-induced breakdown
Vibration mode shape
Continuous wavelet transformation
Issue Date: 4-Aug-2014
Publisher: Elsevier
Journal Title: Journal of Sound and Vibration
Volume: 333
Issue: 16
Start Page: 3609
End Page: 3624
Publisher DOI: 10.1016/j.jsv.2014.04.008
Abstract: In this paper, a vibration testing and health monitoring system based on an impulse response excited by laser is proposed to detect damage in membrane structures. A high power Nd: YAG pulse laser is used to supply an ideal impulse to a membrane structure by generating shock waves via laser-induced breakdown in air. A health monitoring apparatus is developed with this vibration testing system and a damage detecting algorithm which only requires the vibration mode shape of the damaged membrane. Artificial damage is induced in membrane structure by cutting and tearing the membrane. The vibration mode shapes of the membrane structure extracted from vibration testing by using the laser-induced breakdown and laser Doppler vibrometer are then analyzed by 2-D continuous wavelet transformation. The location of damage is determined by the dominant peak of the wavelet coefficient which can be seen clearly by applying a boundary treatment and the concept of an iso-surface to the 2-D wavelet coefficient. The applicability of the present approach is verified by finite element analysis and experimental results, demonstrating the ability of the method to detect and identify the positions of damage induced on the membrane structure.
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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