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Proceedings Paper

Analysis of instantaneous characteristics of guided ultrasonic waves in metallic structures with aluminium repair patches
Author(s): S. Pavlopoulou; W. J. Staszewski; C. Soutis; G. Manson
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Paper Abstract

Lamb wave inspection is one of the most widely used damage detection techniques based on ultrasonic waves. Many signal processing techniques have been developed for extraction of signal features related to damage. The majority of these investigations focus on amplitude analysis. The paper analyses Lamb wave instantaneous phase and frequency. The Hilbert transform is used to obtain signal instantaneous characteristics. Application examples are related to smart structural repair. Cracked metallic plates are repaired using bonded aluminium patches instrumented with low-profile, surface bonded piezoceramic transducers. The study demonstrates that phase and frequency information from Lamb waves is very useful for monitoring structural repair.

Paper Details

Date Published: 18 April 2011
PDF: 10 pages
Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79842Y (18 April 2011); doi: 10.1117/12.886187
Show Author Affiliations
S. Pavlopoulou, The Univ. of Sheffield (United Kingdom)
W. J. Staszewski, The Univ. of Sheffield (United Kingdom)
C. Soutis, The Univ. of Sheffield (United Kingdom)
G. Manson, The Univ. of Sheffield (United Kingdom)

Published in SPIE Proceedings Vol. 7984:
Health Monitoring of Structural and Biological Systems 2011
Tribikram Kundu, Editor(s)

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