Detection and localization of closely distributed damages via lamb wave sparse reconstruction

Jiadong Hua1, Chen Lu2, Zili Wang3, Jing Lin4

School of Reliability and Systems Engineering, Beihang University, Beijing, 100191, China

Science and Technology on Reliability and Environmental Engineering Laboratory, Beijing, China

2Corresponding author

E-mail: 1huajiadong@buaa.edu.cn, 2luchen@buaa.edu.cn, 3wzl@buaa.edu.cn, 4jinglin@mail.xjtu.edu.cn

Received 25 September 2017; accepted 1 October 2017

DOI https://doi.org/10.21595/vp.2017.19222

 

Abstract. Ultrasonic Lamb wave is a promising tool for structural health monitoring and nondestructive evaluation of plate-like structures. Using an array with several piezoelectric discs for damage imaging (i.e. visual detection and localization) is of interest. Commonly used
delay-and-sum method is limited for overlapped signals when several damages are closely distributed in the structure. To overcome this limitation, modal-based sparse reconstruction imaging method is applied for adjacent damages in this study. Firstly, Lamb wave dispersion curve is obtained by solving the Rayleigh-Lamb equations. Subsequently, propagation modal of the damage-reflected signal is constructed based on the solved dispersion curve. Finally, the modal is used for damage imaging via sparse reconstruction and basis pursuit de-noising. Experimental data measured in an aluminum plate is considered, and the result demonstrates that the sparse reconstruction imaging method is effective to detect and localize closely distributed damages in the presence of signal overlapping.

Keywords: structural health monitoring, nondestructive evaluation, Lamb wave, sparse reconstruction.

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Cite this article

Hua Jiadong, Lu Chen, Wang Zili, Lin Jing Detection and localization of closely distributed damages via lamb wave sparse reconstruction. Vibroengineering PROCEDIA, Vol. 14, 2017, p. 115‑119.

 

JVE International Ltd. Vibroengineering PROCEDIA. Oct 2017, Vol. 14. ISSN 2345-0533