Analysis of elastic wave propagation excited by acoustic non-contact method

Damian Mindykowski; Tomasz Wandowski; Maciej Radzieński; Paweł Kudela

doi:10.1117/12.2581279

22 March 2021 Analysis of elastic wave propagation excited by acoustic non-contact method

Damian Mindykowski, Tomasz Wandowski, Maciej Radzieński, Paweł Kudela

Proceedings Volume 11593, Health Monitoring of Structural and Biological Systems XV; 115930T (2021) https://doi.org/10.1117/12.2581279
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

Abstract

Evaluation of optimal slope angle of an air-coupled transducer (ACT) is important, to allow for effective generation of Lamb waves in solid structures. This effectiveness relies on both generation of desired wave modes, amplitude of measured signals and large coverage area for damage detection. Phenomenon of non-contact elastic waves generation in plate based on ACT is considered assuming few approaches. Numerical modeling in COMSOL is related to the analysis of different plate thicknesses and ACT excitation frequencies. Experimental research is based on wave excitation using piezoceramic ACT with a base excitation frequency of 40 kHz and SLDV measurements for a 1 mm-thick plate. A comprehensive investigation of optimal ACT slope angle for the generation of A₀ mode is included. Propagation of S₀ mode was not observed in numerical as well as experimental results. Optimal slope angle values were estimated in different ways numerically and experimentally with the use of dispersion curves and based on the amplitude of generated waves. Finally, the optimal angle value was determined and utilized for damage detection and localization problem in an aluminum plate.

Conference Presentation

Citation Download Citation

Damian Mindykowski, Tomasz Wandowski, Maciej Radzieński, and Paweł Kudela "Analysis of elastic wave propagation excited by acoustic non-contact method", Proc. SPIE 11593, Health Monitoring of Structural and Biological Systems XV, 115930T (22 March 2021); https://doi.org/10.1117/12.2581279

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