Lamb wave tomography for defect localization using wideband dispersion reversal method

被引:14
作者
Ling, Feiyao [1 ,2 ]
Chen, Honglei [3 ]
Lang, Yanfeng [4 ]
Yang, Zhibo [4 ]
Xu, Kailiang [1 ,2 ,3 ]
Ta, Dean [1 ,2 ,3 ]
机构
[1] Fudan Univ, Sch Informat Sci & Technol, Ctr Biomed Engn, Shanghai 200433, Peoples R China
[2] Fudan Univ, State Key Lab Integrated Chips & Syst, Shanghai 201203, Peoples R China
[3] Fudan Univ, Yiwu Res Inst, Yiwu 322000, Zhejiang, Peoples R China
[4] Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Shaanxi, Peoples R China
关键词
Ultrasonic Lamb waves; Wideband dispersion reversal; Independent component analysis; Tomography algorithm; SELECTIVE GENERATION; MODES; EXCITATION; SIGNALS; SYSTEM;
D O I
10.1016/j.measurement.2023.112965
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Tomography imaging of defects using ultrasonic Lamb waves has attracted much attention in nondestructive testing of plates. However, there are two challenges for robust localization of defects: frequency sensitivity to defects, and multi-mode interference on damage index (DI) extraction. Aiming for that, a wideband dispersion reversal (WDR) method optimized tomography is developed. Pre-dispersive wideband excitations of a certain Lamb wave mode are generated based on the configuration of transducers, and reconstruction independent component analysis is used for wave mode separation. According to the acoustic reciprocity principle, selfcompensation phenomenon of mode signals can be recorded on the intact path, where the signal energy concentrates at a fix self-compensation point in the time-frequency domain, yet such compensation effect would be impaired encountering defects. Thus, a time-frequency index can be used as the DI, which is calculated based on the weighted Euclidean distance from the self-compensation point to the pixel points in the time-frequency domain. Experimental results show the WDR optimized tomography has a robust performance for magnetsimulated defects imaging without excitation frequency optimization.
引用
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页数:11
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