Warped frequency transform for damage detection using Lamb waves

Luca De Marchi; Massimo Ruzzene; Buli Xu; Emanuele Baravelli; Alessandro Marzani; Nicolò Speciale

doi:10.1117/12.847688

8 April 2010 Warped frequency transform for damage detection using Lamb waves

Luca De Marchi, Massimo Ruzzene, Buli Xu, Emanuele Baravelli, Alessandro Marzani, Nicolò Speciale

Proceedings Volume 7650, Health Monitoring of Structural and Biological Systems 2010; 76500F (2010) https://doi.org/10.1117/12.847688
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

A novel time-frequency procedure is presented in this paper for guided wave (GW) propagation analysis in structure health monitoring (SHM) applications.The proposed approach combines the Warped Frequency Transform (WFT) with a Basis Pursuit algorithm to generate a sparse yet accurate time-frequency representation of the acquired signals even in the case of multi-modal dispersive propagation associated to broadband excitation of the waveguide. This is obtained through over complete dictionaries composed by optimized atoms which are designed to match the spectro-temporal structure of the various propagating modes.The Warped Basis Pursuit (W-BP) decomposition of several acquired waveforms results in distance signals that can be combined through classical beamforming techniques for imaging purposes. This approach is tested on experimental data obtained by broadband GW excitation in a 1 mm thick aluminum plate with an artificially introduced through crack, followed by multiple waveguide displacement recording through a scanning laser Doppler vibrometer. Dispersion compensation and high-resolution source as well as defect imaging is demonstrated even in domain regions that are not directly accessible for measurement.

Citation Download Citation

Luca De Marchi, Massimo Ruzzene, Buli Xu, Emanuele Baravelli, Alessandro Marzani, and Nicolò Speciale "Warped frequency transform for damage detection using Lamb waves", Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76500F (8 April 2010); https://doi.org/10.1117/12.847688

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