Total absorption peak by use of a rigid frame porous layer backed by a rigid multi-irregularities grating
- 1 May 2010
- journal article
- research article
- Published by Acoustical Society of America (ASA) in The Journal of the Acoustical Society of America
- Vol. 127 (5), 2865-2874
- https://doi.org/10.1121/1.3337235
Abstract
The acoustic properties of a low resistivity porous layer backed by a rigid plate containing periodic rectangular irregularities, creating a multicomponent diffraction gratings, are investigated. Numerical and experimental results show that the structure possesses a total absorption peak at the frequency of the modified mode of the layer, when designed as proposed in the article. These results are explained by an analysis of the acoustic response of the whole structure and especially by the modal analysis of the configuration. When more than one irregularity per spatial period is considered, additional higher frequency peaks are observed.This publication has 26 references indexed in Scilit:
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