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Proceedings Paper

Impact localization on a cylindrical plate by near-field beamforming analysis
Author(s): Hayato Nakatani; Talieh Hajzargarbashi; Kaita Ito; Tribikram Kundu; Nobuo Takeda
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Paper Abstract

A beamforming array technique with 4 sensors is applied to a cylindrical plate for detecting point of impact. Linear array of acoustic sensors attached to the plate record the waveforms of Lamb waves generated at the impact point with individual time delay. An optimization technique with an objective function is incorporated into the beamforming technique in order to deal with the direction dependent Lamb wave speeds in a cylindrical geometry. The optimization is carried out using the experimentally obtained wave speed as a function of propagation direction. The maximum point in beamforming plot with minimized objective function corresponds to the localized point of impact. The proposed technique is experimentally verified by comparing the predicted points with the exact points of impact on a cylindrical aluminum plate. For randomly chosen points of impact the beamforming technique successfully predicts location of the exact acoustic source.

Paper Details

Date Published: 3 April 2012
PDF: 11 pages
Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 83450Y (3 April 2012); doi: 10.1117/12.915010
Show Author Affiliations
Hayato Nakatani, Tokyo Univ. of Science (Japan)
Talieh Hajzargarbashi, The Univ. of Arizona (United States)
Kaita Ito, The Univ. of Tokyo (Japan)
Tribikram Kundu, The Univ. of Arizona (United States)
Nobuo Takeda, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 8345:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
Masayoshi Tomizuka; Chung-Bang Yun; Jerome P. Lynch, Editor(s)

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