Multimodal lamb wave identification using combination of instantaneous frequency with EMD

Wang, Z.; Huang, S.L.; Sun, H.Y.; Wang, S.; Wang, Q.; Zhao, W.

doi:10.1109/i2mtc.2019.8827058

Multimodal lamb wave identification using combination of instantaneous frequency with EMD

Wang, Z.; Huang, S.L.; Sun, H.Y.; Wang, S.; Wang, Q.; Zhao, W.

Authors

Dr Qing Wang qing.wang@durham.ac.uk
Associate Professor

S.L. Huang

H.Y. Sun

Dr Qing Wang qing.wang@durham.ac.uk
Associate Professor

W. Zhao

Abstract

Lamb wave is guided plate wave that has potential in industrial inspection for non-destructive evaluation. However, the multimodal nature of Lamb wave obstructs the extraction and interpretation of information in signal. This work proposes a Lamb wave mode identification method combining instantaneous frequency (IF) with empirical mode decomposition (EMD). Firstly, EMD is implemented on multimodal signal and separates it into individual mode functions. Then the individual functions are analyzed by high-resolution time-frequency distribution. Finally, IF curve is obtained in the time-frequency domain and corresponding time information is used to calculate wave velocity. Lamb wave mode is determined by comparing the wave velocity with theoretical value. To verify the effectiveness of the proposed method, simulation presents the situation of boundary reflection and experiment presents the mode conversion by defect. Both simulation and experiment demonstrate the good performance of the mode identification method.

Citation

Wang, Z., Huang, S., Sun, H., Wang, S., Wang, Q., & Zhao, W. (2019). Multimodal lamb wave identification using combination of instantaneous frequency with EMD. In 2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2019) ; proceedings. https://doi.org/10.1109/i2mtc.2019.8827058

Conference Name	2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2019)
Conference Location	Auckland, New Zealand
Acceptance Date	Jan 22, 2019
Publication Date	Jan 1, 2019
Deposit Date	Mar 26, 2019
Publicly Available Date	Nov 13, 2019
Series ISSN	2642-2077
Book Title	2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2019) ; proceedings.
DOI	https://doi.org/10.1109/i2mtc.2019.8827058

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