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Proceedings Paper

Warped frequency transform for damage detection using Lamb waves
Author(s): Luca De Marchi; Massimo Ruzzene; Buli Xu; Emanuele Baravelli; Alessandro Marzani; Nicolò Speciale
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Paper 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.

Paper Details

Date Published: 8 April 2010
PDF: 8 pages
Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76500F (8 April 2010); doi: 10.1117/12.847688
Show Author Affiliations
Luca De Marchi, Univ. di Bologna (Italy)
Massimo Ruzzene, Georgia Institute of Technology (United States)
Buli Xu, Georgia Institute of Technology (United States)
Emanuele Baravelli, Univ. di Bologna (Italy)
Alessandro Marzani, Univ. di Bologna (Italy)
Nicolò Speciale, Univ. di Bologna (Italy)

Published in SPIE Proceedings Vol. 7650:
Health Monitoring of Structural and Biological Systems 2010
Tribikram Kundu, Editor(s)

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