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Article dans une revue

Enhancing the absorption coefficient of a backed rigid frame porous layer by embedding circular periodic inclusions

Abstract : The acoustic properties of a porous sheet of medium static air flow resistivity (around 10 000Nms-4), in which a periodic set of circular inclusions is embedded and which is backed by a rigid plate, are investigated. The inclusions and porous skeleton are assumed motionless. Such a structure behaves like a multi-component diffraction grating. Numerical results show that this structure presents a quasi-total (close to unity) absorption peak below the quarter-wavelength resonance of the porous sheet in absence of inclusions. This result is explained by the excitation of a complex trapped mode. When more than one inclusion per spatial period is considered, additional quasi-total absorption peaks are observed. The numerical results, as calculated with the help of the mode-matching method described in this paper, agree with those calculated using a finite element method.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02458855
Contributeur : Olivier Dazel <>
Soumis le : mercredi 29 janvier 2020 - 07:34:26
Dernière modification le : mardi 26 janvier 2021 - 15:36:09

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J.-P. Groby, Olivier Dazel, Aroune Duclos, L. Boeckx, L. Kelders. Enhancing the absorption coefficient of a backed rigid frame porous layer by embedding circular periodic inclusions. Journal of the Acoustical Society of America, Acoustical Society of America, 2011, 130 (6), pp.3771-3780. ⟨10.1121/1.3652865⟩. ⟨hal-02458855⟩

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