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Advances in Materials Science and Engineering
Volume 2015, Article ID 896035, 10 pages
http://dx.doi.org/10.1155/2015/896035
Research Article

Mechanical Parameters Effects on Acoustic Absorption at Polymer Foam

1Hyperfrequencies and Semiconductor Laboratory, Faculty of Sciences of Technology, Mentouri Brothers University of Constantine, P.B. 325, 25017 Constantine, Algeria
2Faculty of Medical Science, Constantine 3 University, P.B. 125, 25000 Constantine, Algeria

Received 20 June 2015; Revised 9 August 2015; Accepted 10 August 2015

Academic Editor: Belal F. Yousif

Copyright © 2015 Lyes Dib et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Polymer foams have acoustic absorption properties that play an important role in reducing noise level. When the skeleton is set to motion, it is necessary to use generalized Biot-Allard model which takes into account the deformation of the skeleton and the fluid and the interactions between them. The aim of this work is to study the quality of acoustic absorption in polyurethane foam and to show the importance of the structural vibration of this foam on the absorption by varying mechanical parameters (Young’s modulus , Poisson’s coefficient , structural damping factor , and the density ). We calculated the absorption coefficient analytically using classical Biot formulation (, ) and numerically using Biot mixed formulation (, ) in 3D COMSOL Multiphysics. The obtained results are compared together and show an excellent agreement. Afterwards, we studied the effect of varying each mechanical parameter independently on the absorption in interval of ±20%. The simulations show that these parameters have an influence on the sound absorption around the resonance frequency .