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Investigation of long acoustic waveguides for the very low frequency characterization of monolayer and stratified air-saturated poroelastic materials

Abstract : When sound propagates in a porous medium, it is attenuated via several energy loss mechanisms which are switched on or o as the excitation frequency varies. The classical way of measuring acoustic energy loss in porous materials uses the Kundt impedance tube. However, due to its short length, measurements are made in the steady state harmonic regimes. Its lower cuto frequency is often limited to a few hundreds of Hertz. Two long acoustic waveguides were assembled from water pipes and mounted to create test-rigs for the low-frequency acoustic characterization of monolayer and stratied air-waveguides were found to be equivalent and provided data down to frequencies of the order of ≈ 12 Hz.
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https://hal.archives-ouvertes.fr/hal-03250845
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Soumis le : lundi 11 octobre 2021 - 13:44:47
Dernière modification le : mardi 19 octobre 2021 - 22:49:51

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Erick Ogam, Zine El Abiddine Fellah, Géry Ogam, Nicholas Ongwen, Andrew Oduor. Investigation of long acoustic waveguides for the very low frequency characterization of monolayer and stratified air-saturated poroelastic materials. Applied Acoustics, Elsevier, 2021, 182, pp.108200. ⟨10.1016/j.apacoust.2021.108200⟩. ⟨hal-03250845⟩

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