Title: Enhancing the absorption coefficient of a backed rigid frame porous layer by embedding circular periodic inclusions
Authors: Groby, J-P ×
Dazel, O
Duclos, A
Boeckx, L
Kelders, Luc #
Issue Date: Dec-2011
Publisher: American Institute of Physics for the Acoustical Society of America
Series Title: Journal of the Acoustical Society of America vol:130 issue:6 pages:3771-3780
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.
ISSN: 0001-4966
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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