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Proceedings Paper

Distance-domain based localization techniques for acoustic emission sources: a comparative study
Author(s): Krzysztof Grabowski; Mateusz Gawronski; Hayato Nakatani; Pawel Packo; Ireneusz Baran; Wojciech L. Spychalski; Wieslaw J. Staszewski; Tadeusz Uhl; Tribikram Kundu
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Paper Abstract

Acoustic Emission phenomenon is of great importance for analyzing and monitoring health status of critical structural components. In acoustic emission, elastic waves generated by sources propagate through the structure and are acquired by networks of sensors. Ability to accurately locate the event strongly depends on the type of medium (e.g. geometrical features) and material properties, that result in wave signals distortion. These effects manifest themselves particularly in plate structures due to intrinsic dispersive nature of Lamb waves. In this paper two techniques for acoustic emission source localization in elastic plates are compared: one based on a time-domain distance transform and the second one is a two-step hybrid technique. A time-distance domain transform approach, transforms the time-domain waveforms into the distance domain by using wavenumber-frequency mapping. The transform reconstructs the source signal removing distortions resulting from dispersion effects. The method requires input of approximate material properties and geometrical features of the structure that are relatively easy to estimate prior to measurement. Hence, the method is of high practical interest. Subsequently, a two-step hybrid technique, which does not require apriori knowledge of material parameters, is employed. The method requires a setup of two predefined clusters of three sensors in each. The Lamb wave source is localized from the intersection point of the predicted wave propagation directions for the two clusters. The second step of the two-step hybrid technique improves the prediction by minimizing an objective function. The two methods are compared for analytic, simulated and experimental signals.

Paper Details

Date Published: 13 April 2015
PDF: 9 pages
Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 94381T (13 April 2015); doi: 10.1117/12.2084296
Show Author Affiliations
Krzysztof Grabowski, AGH Univ. of Science and Technology (Poland)
Mateusz Gawronski, AGH Univ. of Science and Technology (Poland)
Hayato Nakatani, Osaka City Univ. (Japan)
Pawel Packo, AGH Univ. of Science and Technology (Poland)
Ireneusz Baran, Cracow Univ. of Technology (Poland)
Wojciech L. Spychalski, Warsaw Univ. of Technology (Poland)
Wieslaw J. Staszewski, AGH Univ. of Science and Technology (Poland)
Tadeusz Uhl, AGH Univ. of Science and Technology (Poland)
Tribikram Kundu, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 9438:
Health Monitoring of Structural and Biological Systems 2015
Tribikram Kundu, Editor(s)

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