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Localization and increased damping in irregular acoustic cavities

Summary: Localization and increased damping in
irregular acoustic cavities
S. F´elix a,, M. Asch b
, M. Filoche a,c
B. Sapoval a,c
aLaboratoire de Physique de la Mati`ere Condens´ee, UMR CNRS 7643, Ecole
polytechnique, 91128 Palaiseau Cedex, France
bLaboratoire Ami´enois de Math´ematique Fondamentale et Appliqu´ee UMR CNRS
6140, Universit´e de Picardie Jules Verne, 80039 Amiens Cedex 1, France
cCentre de Math´ematiques et de Leurs Applications, UMR CNRS 8536, Ecole
Normale Sup´erieure, 94235 Cachan Cedex, France
It is found that acoustical cavities with irregular geometry exhibit quite generally
localization effects and increased damping. Of particular interest is a specific exalta-
tion of damping linked to localization. This is shown here in the case of 2D shallow
cavities with several different type of irregular boundaries.
1 Introduction
It is classical in room acoustics to cover walls with an absorbing material
to damp acoustic waves. One may even use "rough" absorbers, as curtains,
Corresponding author. Fax: + 33 169 333 004


Source: Asch, Mark - Faculté de Mathématiques et d' Informatique, Université de Picardie Jules Verne


Collections: Mathematics; Computer Technologies and Information Sciences