Single Mode Tuning Effects on Lamb Wave Time Reversal with Piezoelectric Wafer Active Sensors for Structural Health Monitoring |
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Authors: | Buli Xu Victor Giurgiutiu |
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Affiliation: | (1) Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA |
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Abstract: | Lamb wave time reversal method is a new and tempting baseline-free damage detection technique for structural health monitoring.
With this method, certain types of damage can be detected without baseline data. However, the application of this method using
piezoelectric wafer active sensors (PWAS) is complicated by the existence of at least two Lamb wave modes at any given frequency,
and by the dispersion nature of the Lamb wave modes existing in thin-wall structures. The theory of PWAS-related Lamb wave
time reversal has not yet been fully studied.
This paper addresses this problem by developing a theoretical model for the analysis of PWAS-related Lamb wave time reversal
based on the exact solutions of the Rayleigh-Lamb wave equation. The theoretical model is first used to predict the existence
of single-mode Lamb waves. Then the time reversal behavior of single-mode and two-mode Lamb waves is studied numerically.
The advantages of single-mode tuning in the application of time reversal damage detection are highlighted. The validity of
the proposed theoretical model is verified through experimental studies. In addition, a similarity metric for judging time
invariance of Lamb wave time reversal is presented. It is shown that, under certain condition, the use of PWAS-tuned single-mode
Lamb waves can greatly improve the effectiveness of the time-reversal damage detection procedure. |
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Keywords: | Lamb wave Time reversal Time invariance SHM PWAS Single mode tuning |
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