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Appl. Sci. 2019, 9(3), 555; https://doi.org/10.3390/app9030555

Mode Separation for Multimodal Ultrasonic Lamb Waves Using Dispersion Compensation and Independent Component Analysis of Forth-Order Cumulant

1,2,*
and
1
1
School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
2
Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Meteorological Exploration and Information Processing, Nanjing 210044, China
*
Author to whom correspondence should be addressed.
Received: 31 December 2018 / Revised: 1 February 2019 / Accepted: 2 February 2019 / Published: 7 February 2019
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Abstract

Ultrasonic Lamb wave testing has been successfully applied in nondestructive testing. However, because of Lamb wave multimodal and dispersion characteristics, the received signals are often multimodal and overlapping, which makes them very complicated. This paper proposes a mode separation method by combining dispersion compensation with the independent component analysis of fourth-order cumulant. Taking two-mode overlapped signals as an example, the single-mode dispersion compensation is performed according to the measured distance difference between the two sets of signals. The two sets of signals are returned to the same distance. The fourth-order cumulant independent component analysis method is further used to process the Lamb wave signals of different superposition situations at the same distance. The corresponding mode signal contained in the two sets of signals is separated through the joint diagonalization of the whitened fourth-order cumulant matrix. The different modes are compensated and separated successively, achieving the multimodal signal separation. Experimental results in steel plates show that the presented method can accurately achieve mode separation for the multimodal overlapping Lamb waves. This is helpful for the signal processing of multimodal Lamb waves. View Full-Text
Keywords: Lamb wave; dispersion compensation; blind signal separation; mode separation; independent component analysis Lamb wave; dispersion compensation; blind signal separation; mode separation; independent component analysis
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Chen, X.; Ma, D. Mode Separation for Multimodal Ultrasonic Lamb Waves Using Dispersion Compensation and Independent Component Analysis of Forth-Order Cumulant. Appl. Sci. 2019, 9, 555.

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