In this paper, an experimental study was performed to investigate the possibility of a new NDE system - Tapping Sound Analysis (TSA). The tapping sound and contact force of healthy laminated composite structure and defective laminated composite structure were measured using tapping device. The feature extraction method based on the wavelet packet transform was used to extract features from the tapping sound. Comparing the feature of the tapping sound of healthy structure and defective structure, a feature index could be derived, which indicates the existence of defect inside the laminated composite structure. Using the feature index, the difference between the tapping sound data of the present specimens could be expressed as a single value.

Date Published: 18 June 2002
PDF: 8 pages
Proc. SPIE 4704, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures, (18 June 2002); doi: 10.1117/12.470708

Published in SPIE Proceedings Vol. 4704:
Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures
Andrew L. Gyekenyesi; Steven M. Shepard; Dryver R. Huston; A. Emin Aktan; Peter J. Shull, Editor(s)