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Proceedings Paper

New nondestructive evaluation method of laminated composite structures by tapping sound analysis
Author(s): Joon Seok Hwang; Seung Jo Kim
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Paper Abstract

In this paper, a study based on the numerical simulation is performed to investigate the possibility of a new NDE system - Tapping Sound Analysis (TSA). Through the investigation of existing coin tap method, coin tap method cannot be used alone for the detection of defects inside general structure. TSA detects the existence of defects inside the laminated composite structures by comparing tapping sound with pre-computed sound data of healthy structures. Tapping on the structures is modeled as impact problem and solved using finite element method. Calculation of sound is formulated based on the coupled finite element and boundary element method. To extract the features from the tapping sound, wavelet packet transform is utilized. Numerical simulation of tapping sound and feature extraction scheme show that the tapping sound can be used in the identification of defects of laminated composites.

Paper Details

Date Published: 3 August 2001
PDF: 9 pages
Proc. SPIE 4336, Nondestructive Evaluation of Materials and Composites V, (3 August 2001); doi: 10.1117/12.435555
Show Author Affiliations
Joon Seok Hwang, Seoul National Univ. (South Korea)
Seung Jo Kim, Seoul National Univ. (South Korea)

Published in SPIE Proceedings Vol. 4336:
Nondestructive Evaluation of Materials and Composites V
George Y. Baaklini; Eric S. Boltz; Steven M. Shepard; Peter J. Shull, Editor(s)

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