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Enhancing the absorption properties of acoustic porous plates by periodically embedding Helmholtz resonators

Abstract : This paper studies the acoustical properties of hard-backed porous layers with periodically embedded air filled Helmholtz resonators. It is demonstrated that some enhancements in the acoustic absorption coefficient can be achieved in the viscous and inertial regimes at wavelengths much larger than the layer thickness. This enhancement is attributed to the excitation of two specific modes: Helmholtz resonance in the viscous regime and a trapped mode in the inertial regime. The enhancement in the absorption that is attributed to the Helmholtz resonance can be further improved when a small amount of porous material is removed from the resonator necks. In this way the frequency range in which these porous materials exhibit high values of the absorption coefficient can be extended by using Helmholtz resonators with a range of carefully tuned neck lengths.
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https://hal.archives-ouvertes.fr/hal-01179024
Contributeur : Benoit Nennig <>
Soumis le : mardi 21 juillet 2015 - 14:53:07
Dernière modification le : vendredi 22 janvier 2021 - 03:19:59

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J.-P. Groby, Benoit Nennig, Clément Lagarrigue, Bruno Brouard, Olivier Dazel, et al.. Enhancing the absorption properties of acoustic porous plates by periodically embedding Helmholtz resonators. Journal of the Acoustical Society of America, Acoustical Society of America, 2015, 137 (6), pp.273-280. ⟨10.1121/1.4904534⟩. ⟨hal-01179024⟩

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