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1 April 2019 Lamb wave virtual time reversal damage detection algorithm with transducer transfer function compensation
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Abstract
This paper presents a Lamb wave virtual time reversal algorithm with transducer transfer function compensation to eliminate the transducer influence for dispersive, multimodal Lamb waves. This virtual time reversal procedure builds upon a complete 2D analytical model for Lamb wave generation, propagation, and reception. The analytical solution shows that, with the transducer transfer function compensation, a perfect reconstruction of the original excitation waveform can be achieved for both symmetric and antisymmetric Lamb wave modes. In addition, the Finite Element Modeling (FEM) and experimental validations are further performed to verify the compensated virtual time reversal procedure. Finally, a time reversal tomography experiment is conducted with a piezoelectric transducer array for structural damage imaging. The Lamb wave virtual time reversal algorithm with transducer transfer function compensation can achieve more accurate and robust damage imaging results. The paper finishes with discussion, concluding remarks, and suggestions for future work.
Conference Presentation
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Junzhen Wang and Yanfeng Shen "Lamb wave virtual time reversal damage detection algorithm with transducer transfer function compensation", Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 1097222 (1 April 2019); https://doi.org/10.1117/12.2514200
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