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

被引:14
作者
Chen, Xiao [1 ,2 ]
Ma, Dandan [1 ]
机构
[1] Nanjing Univ Informat Sci & Technol, Sch Elect & Informat Engn, Nanjing 210044, Jiangsu, Peoples R China
[2] Collaborat Innovat Ctr Atmospher Environm & Equip, Jiangsu Key Lab Meteorol Explorat & Informat Proc, Nanjing 210044, Jiangsu, Peoples R China
来源
APPLIED SCIENCES-BASEL | 2019年 / 9卷 / 03期
关键词
Lamb wave; dispersion compensation; blind signal separation; mode separation; independent component analysis; FRACTIONAL DERIVATIVE METHOD; SIGNALS; NOISE;
D O I
10.3390/app9030555
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页数:11
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