https://doi.org/10.1051/epjconf/201817004024
Impact of the Test Device on the Behavior of the Acoustic Emission Signals: Contribution of the Numerical Modeling to Signal Processing
Aix-Marseille Univ., CNRS, Centrale Marseille, LMA, France toumarissiaka@gmail.com, cristini@lma.cnrs-mrs.fr, favretto@lma.cnrsmrs.fr
CEA, DEN, DER/SRES, Cadarache, F13108 Saint-Paul-Lez-Durance, France laurent.pantera@cea.fr
Université de Perpignan via Domitia, LAMPS, 52 av. Paul Alduy, 66860 Perpignan Cedex 9, France and Université Paul Sabatier, 118 Route de Narbonne, F-31062 Toulouse Cedex 9, France
Published online: 10 January 2018
In a context of nuclear safety experiment monitoring with the non destructive testing method of acoustic emission, we study the impact of the test device on the interpretation of the recorded physical signals by using spectral finite element modeling. The numerical results are validated by comparison with real acoustic emission data obtained from previous experiments. The results show that several parameters can have significant impacts on acoustic wave propagation and then on the interpretation of the physical signals. The potential position of the source mechanism, the positions of the receivers and the nature of the coolant fluid have to be taken into account in the definition a pre-processing strategy of the real acoustic emission signals. In order to show the relevance of such an approach, we use the results to propose an optimization of the positions of the acoustic emission sensors in order to reduce the estimation bias of the time-delay and then improve the localization of the source mechanisms.
Key words: Acoustic Emission / Reactivity Initiated Accident / Spectral Finite Element Modeling
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
