Achour Aknine
Centre national de la recherche scientifique
6 Papers
81 Citations
Achour Aknine is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Tortuosity & Porous medium. The author has an hindex of 4, co-authored 6 publications.
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Papers
Effects of compression on the sound absorption of fibrous materials
TL;DR: In this article, some heuristic formulae are proposed which take into account the modifications of the physical parameters (porosity, resistivity, tortuosity and shape factors) which enter the standard equivalent fluid model.
113
Acoustical properties of partially reticulated foams with high and medium flow resistance
TL;DR: In this article, the Biot theory was used for measuring the surface impedance of three foams in free field and two dilatational waves were taken into account to evaluate the normal surface impedance.
64
Parametric study of the influence of compression on the acoustical absorption coefficient of automotive felts
TL;DR: In this paper, the authors used an equivalent fluid model with five parameters to predict the decrease in the absorption coefficient of compressed porous materials, and validated this prediction technique with some industrial materials being 1-D compressed along their thickness.
16
Réflexion/réfraction d'ondes acoustiques à une interface fluide/matériau poreux anisotrope
Achour Aknine,Bernard Castagnède,Claude Depollier +2 more
- 01 Apr 1997
TL;DR: In this paper, the coefficients de reflexion and de transmission en energie sont etudies for une interface fluide/solide poreux, and the modelisation prend en compte l'anisotropie.
4
Propagation of an ultrasonic impulse in porous media having a rigid frame
TL;DR: In this paper, a theoretical model of the sound propagation in a dispersive porous material is presented, where the interactions between fluid and structure are taken into account in the dynamic tortuosity α(ω) and the dynamic compressibility β(ω), defined by the basic equations ρα(ω)(∂ ǫ/ǫ) defined by ρ(ǫ)/Ka), (β(ω)/ǫ), (∂ )ǫ/(ǫ)-v), (α(∆) defined in the domain of low-frequency approximation
2