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Sensors 2017, 17(5), 955; doi:10.3390/s17050955

A Modified Lamb Wave Time-Reversal Method for Health Monitoring of Composite Structures

1
School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China
*
Author to whom correspondence should be addressed.
Academic Editors: M. H. Ferri Aliabadi and Zahra Sharif Khodaei
Received: 10 March 2017 / Revised: 17 April 2017 / Accepted: 23 April 2017 / Published: 26 April 2017
(This article belongs to the Special Issue Sensor Technologies for Health Monitoring of Composite Structures)
View Full-Text   |   Download PDF [4390 KB, uploaded 26 April 2017]   |  

Abstract

Because the time reversal operator of Lamb waves varies with frequency in composite structures, the reconstructed signal deviates from the input signal even in undamaged cases. The damage index captures the discrepancy between the two signals without differentiating the effects of time reversal operator from those of damage. This results in the risk of false alarm. To solve this issue, a modified time reversal method (MTRM) is proposed. In this method, the frequency dependence of the time reversal operator is compensated by two steps. First, an amplitude modulation is placed on the input signal, which is related to the excitability, detectability, and attenuation of the Lamb wave mode. Second, the damage index is redefined to measure the deviation between the reconstructed signal and the modulated input signal. This could indicate the presence of damage with better performance. An experimental investigation is then conducted on a carbon fiber-reinforced polymer (CFRP) laminate to illustrate the effectiveness of the MTRM for identifying damage. The results show that the MTRM may provide a promising tool for health monitoring of composite structures. View Full-Text
Keywords: Lamb wave; time reversal; structural health monitoring; composite structures Lamb wave; time reversal; structural health monitoring; composite structures
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zeng, L.; Lin, J.; Huang, L. A Modified Lamb Wave Time-Reversal Method for Health Monitoring of Composite Structures. Sensors 2017, 17, 955.

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