Warped Wigner-Hough Transform for Defect Reflection Enhancement in Ultrasonic Guided Wave Monitoring

被引：3
|
作者：
De Marchi, Luca [2 ]
Baravelli, Emanuele [2 ]
Cera, Giampaolo [2 ]
Speciale, Nicolo [2 ]
Marzani, Alessandro [1 ]
机构：
[1] Univ Bologna, Dept Civil Environm & Mat Engn DICAM, I-40136 Bologna, Italy
[2] Univ Bologna, Dept Elect Informat & Comp Syst DEIS, I-40136 Bologna, Italy
来源：
MATHEMATICAL PROBLEMS IN ENGINEERING | 2012年 / 2012卷
关键词：
LAMB; LOCALIZATION; DISPERSION;
D O I：
10.1155/2012/358128
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To improve the defect detectability of Lamb wave inspection systems, the application of nonlinear signal processing was investigated. The approach is based on a Warped Frequency Transform (WFT) to compensate the dispersive behavior of ultrasonic guided waves, followed by a Wigner-Ville time-frequency analysis and the Hough Transform to further improve localization accuracy. As a result, an automatic detection procedure to locate defect-induced reflections was demonstrated and successfully tested by analyzing numerically simulated Lamb waves propagating in an aluminum plate. The proposed method is suitable for defect detection and can be easily implemented for real-world structural health monitoring applications.
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页数：15
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