Transmission loss through barriers lined with heterogeneous porous materials

  • F.C. Sgard Lab. des Sciences de l'Habitat, DGCB URA CNRS 1652, Ecl. Natl. Travaux Publics de l'Etat, Cedex, France
  • N. Atalla Grp. d'Acoust. l'Univ. de Sherbrooke, Univ. de Sherbrooke, Sherbrooke, Que. J1K2R1, Canada
Keywords: Density (specific gravity), Elastic moduli, Elasticity, Finite element method, Foamed plastics, Mathematical models, Viscoelasticity, Waveguides, Absorption efficiency

Abstract

The effect of solid heterogeneities and acoustic cavities on the normal incidence transmission loss of heterogeneous porous materials inserted in an infinite rectangular waveguide is investigated. The model is based on a finite element Biot-Allard's formulation for the porous patches. The modal behavior of the waveguide accounts for the coupling between the porous material and the waveguide. Numerical results are presented regarding the effect of geometric and physical parameters on the transmission loss performance of highly resistive plastic foam.
Published
2000-09-01
How to Cite
1.
Sgard F, Atalla N. Transmission loss through barriers lined with heterogeneous porous materials. Canadian Acoustics [Internet]. 2000Sep.1 [cited 2019Aug.25];28(3):92-3. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1305
Section
Proceedings of the Acoustics Week in Canada