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Rayonnement et diffusion acoustique en régime impulsionnel sur cibles élastiques immergées : étude par visualisation ultra-rapide et modélisations numériques

Abstract : 2 original tools, experimental and numerical, are proposed for the investigations of acoustic scattering phenomena on water-immersed elastic targets. They supply a new and additional lighting of these phenomena with regard to the conventional methods. They allow the emphasis of the mechanisms of creation of the various types of wave propagated in the considered structures. The space-time diagram of Lamb's waves (An and Sn ; ) at the surface of the object and the spatial distributions in the surrounding fluid were obtained. Scholte-Stoneley wave was observed experimentally in a direct way and its mechanism of creation by the Ao Lamb wave was described numerically. The results obtained on a LINE target concern the scattering and\or the conversions of modes on the local heterogeneity between cylindrical and hemispherical part.
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  • HAL Id : tel-03037293, version 1

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Laurent Derbesse. Rayonnement et diffusion acoustique en régime impulsionnel sur cibles élastiques immergées : étude par visualisation ultra-rapide et modélisations numériques. Electronique. Université de Valenciennes et du Hainaut-Cambrésis, UVHC, (France), 2001. Français. ⟨NNT : 2001VALE0030⟩. ⟨tel-03037293⟩

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