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Thermal imaging of the structural damping induced by an acoustic black hole

Abstract : An Acoustic Black Hole (ABH) is a passive and efficient way to control the flexural vibrations of beams or plates. In its classical form, an ABH consists in a local reduction of the thickness of a structure according to a power law profile, associated to a thin visco-elastic coating placed in the thinnest region. A focalisation and a wave trap effect occur, leading to a localised energy dissipation which induces a local temperature increase. The objective of this paper is twofold. Firstly, the goal is to develop an adequate experimental methodology enabling to map accurately the small temperature variations induced by the local dissipation mechanism. Secondly, from the thermal standpoint, the goal is to provide experimental evidence of a local temperature increase associated to a damping effect in the case of an ABH beam. This paper thus describes a new kind of experimental methodology able to provide original data, bringing some new insight in the ABH physical understanding and the analysis of structural damping.
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Soumis le : lundi 6 avril 2020 - 08:29:13
Dernière modification le : mardi 26 mai 2020 - 18:31:00

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T. Durand-Texte, A. Pelat, G. Penelet, F. Gautier, M. Sécail-Géraud. Thermal imaging of the structural damping induced by an acoustic black hole. Journal of Applied Physics, American Institute of Physics, 2020, 127 (2), pp.025102. ⟨10.1063/1.5128089⟩. ⟨hal-02453078⟩

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