Recovery of Biot's transition frequency of air-saturated poroelastic media using vibroacoustic spectroscopy

Erick Ogam 1 Zine El Abiddine Fellah 1
1 O&I - Ondes et Imagerie
LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
Abstract : The transition frequency marks the passage from low-frequency viscosity dominated flow to high-frequency inertia dominated one in porous media. It was one of the principal characteristics predicted by Biot's theory. The transition frequency has been a theoretical concept for which only theoretical expressions have been developed in recent years. A vibroacoustic spectroscopy experimental method to recover the characteristic frequency (fC) and for gaining insight into the frequency response of fluid-saturated porous materials has been developed. Long thin air-saturated porous rods solicited mechanically are employed for the experiment. Changes in the fluid flow profile with excitation frequency results in relative motion between the skeleton and the saturating-fluid. This enhances the frictional viscous forces, which, in turn, increases damping of the skeletal motion. These transitions are signaled by observable cues in the acquired laser-vibrometry spectrum of the rods' longitudinal vibration mode patterns. The resonance peaks exhibit sudden attenuation (increase in damping) and are interrupted at the transition frequencies evoking a change of propagation medium. These patterns are compared with those of two plains, single phase material (viscoelastic) rods whose modes stand out as regularly spaced moderately damped peaks.
Type de document :
Article dans une revue
Journal of Applied Physics, American Institute of Physics, 2014, 116 (Issue 6), pp.063503. 〈10.1063/1.4892627〉
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https://hal.archives-ouvertes.fr/hal-01056326
Contributeur : Erick Ogam <>
Soumis le : lundi 18 août 2014 - 16:16:15
Dernière modification le : mardi 13 octobre 2015 - 18:14:47

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Erick Ogam, Zine El Abiddine Fellah. Recovery of Biot's transition frequency of air-saturated poroelastic media using vibroacoustic spectroscopy. Journal of Applied Physics, American Institute of Physics, 2014, 116 (Issue 6), pp.063503. 〈10.1063/1.4892627〉. 〈hal-01056326〉

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