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

Luca De Marchi, Emanuele Baravelli, Giampaolo Cera, Nicolò Speciale and Alessandro Marzani

Mathematical Problems in Engineering, 2012, vol. 2012, 1-15

Abstract:

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.

Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnlmpe:358128

DOI: 10.1155/2012/358128

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