Absorption of sound by porous layers with embedded periodic
arrays of resonant inclusions

Lagarrigue, C; Groby, JP; Tournat, V; Dazel, O; Umnova, O

Abstract

The aim of this work is to design a layer of porous material with a high value of the absorption
coefficient in a wide range of frequencies. It is shown that low frequency performance can be
significantly improved by embedding periodically arranged resonant inclusions (slotted cylinders)
into the porous matrix. The dissipation of the acoustic energy in a porous material due to viscous
and thermal losses inside the pores is enhanced by the low frequency resonances of the inclusions
and energy trapping between the inclusion and the rigid backing. A parametric study is performed
in order to determine the influence of the geometry and the arrangement of the inclusions embedded
in a porous layer on the absorption coefficient. The experiments confirm that low frequency
absorption coefficient of a composite material is significantly higher than that of the porous layer
without the inclusions.

Citation

arrays of resonant inclusions. ˜The œJournal of the Acoustical Society of America (Online), 134(6), 4670-4680. https://doi.org/10.1121/1.4824843

• Journal Article Type: Article
• Acceptance Date: Apr 22, 2013
• Publication Date: Dec 1, 2013
• Deposit Date: Jul 31, 2015
• Journal: The Journal of the Acoustical Society of America (JASA)
• Print ISSN: 0001-4966
• Peer Reviewed: Peer Reviewed
• Volume: 134
• Issue: 6
• Pages: 4670-4680
• DOI: https://doi.org/10.1121/1.4824843
• Publisher URL: http://dx.doi.org/10.1121/1.4824843
• Related Public URLs: http://scitation.aip.org/content/asa/journal/jasa
• Additional Information: Funders : Universite du Maine