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Proceedings Paper

Damage detection in composite structures using Lamb wave analysis and time-frequency approach
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Paper Abstract

A methodology based on Lamb wave analysis and time-frequency signal processing has been developed for damage detection and structural health monitoring of composite structures. Because the Lamb wave signals are complex in nature, robust signal processing techniques are required to extract damage features. In this paper, Lamb wave mode conversion is used to detect the damage in composite structures. Matching pursuit decomposition algorithm is used to represent each Lamb wave mode in the time-frequency domain. Results from numerical Lamb wave propagation simulations and experiments using orthotropic composite plate structures are presented. The capability of the proposed algorithm is demonstrated by detecting seeded delaminations in the composite plate samples. The advantages of the methodology include accurate time-frequency resolution, robustness to noise, high computational efficiency and ease of post-processing.

Paper Details

Date Published: 15 April 2011
PDF: 15 pages
Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79813N (15 April 2011); doi: 10.1117/12.880664
Show Author Affiliations
Yingtao Liu, Arizona State Univ. (United States)
Masoud Yekani Fard, Arizona State Univ. (United States)
Seung Bum Kim, Arizona State Univ. (United States)
Aditi Chattopadhyay, Arizona State Univ. (United States)
Derek Doyle, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 7981:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
Masayoshi Tomizuka, Editor(s)

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