Analysis of instantaneous characteristics of guided ultrasonic waves in metallic structures with aluminium repair patches

S. Pavlopoulou; W. J. Staszewski; C. Soutis; G. Manson

doi:10.1117/12.886187

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18 April 2011 Analysis of instantaneous characteristics of guided ultrasonic waves in metallic structures with aluminium repair patches

S. Pavlopoulou, W. J. Staszewski, C. Soutis, G. Manson

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Proceedings Volume 7984, Health Monitoring of Structural and Biological Systems 2011; 79842Y (2011) https://doi.org/10.1117/12.886187
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

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.

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S. Pavlopoulou, W. J. Staszewski, C. Soutis, and G. Manson "Analysis of instantaneous characteristics of guided ultrasonic waves in metallic structures with aluminium repair patches", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79842Y (18 April 2011); https://doi.org/10.1117/12.886187

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