Issue
J. Phys. IV France
Volume 04, Number C5, Mai 1994
3ème Congrés français d'acoustique
3rd French conference on acoustics
Page(s) C5-177 - C5-182
DOI https://doi.org/10.1051/jp4:1994533
3ème Congrés français d'acoustique
3rd French conference on acoustics

J. Phys. IV France 04 (1994) C5-177-C5-182

DOI: 10.1051/jp4:1994533

Modèles récents pour la propagation du son dans les matériaux poreux

J.-F. ALLARD

Laboratoire d'Acoustique de l'Université du Maine, URA 1101 du CNRS, Université du Maine, Avenue Olivier Messiaen, BP. 535, 72017 Le Mans cedex, France


Abstract
The modelling of the interactions between porous structures and saturating fluids has known new developments. D.L. Johnson has given a rigorous definition of tortuosity and has introduced a new parameter, the viscous characteristic dimension. A thermal characterictic dimension can be defined in a similar way. For the case of elastic structures, the two compressional waves must be taken into account. A matrix formulation is presented, which simplifies the modelling of stratified porous materials having an elastic structure.



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