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Réduction des niveaux vibratoires d'un panneau au moyen de trous noirs acoustiques structurés en réseau périodique : conception d'une méta-plaque

Abstract : The "Acoustic Black Hole" (ABH) is a passive device of reducing vibrations of structures without increasing their mass. It consists in a local thinning of the structure, coated with a thin layer of viscoelastic material. The ABH effect results from the local increase in vibratory magnitude, which strongly solicits the coating, giving rise to local significant damping. A detailed analysis of the mechanisms of dissipation of the ABH is carried out : the scattering of bending waves by an ABH is studied when the latter is inserted in an infinite thin plate. It is shown that the coating induces a significant local damping, allowing to significantly increase the global damping. The ABH is especially effective at high frequencies(HF), it is periodized on a plate to take advantage of the band gaps effect at low frequencies (LF). Two lattices (square and triangular) are studied numerically by the PWE method and experimentally by measuring vibratory mobilities. The results show that the plate is damped at the same time in LF by the lattice effect and in HF by the ABH effect.
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  • HAL Id : tel-01717745, version 2

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Omar Aklouche. Réduction des niveaux vibratoires d'un panneau au moyen de trous noirs acoustiques structurés en réseau périodique : conception d'une méta-plaque. Acoustique [physics.class-ph]. Université du Maine, 2017. Français. ⟨NNT : 2017LEMA1030⟩. ⟨tel-01717745v2⟩

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