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In-parallel resonators to increase the absorption of subwavelength acoustic absorbers in the mid-frequency range

Abstract : The acoustic effects of in-parallel resonators is compared to the behavior of a classical single degree of freedom resonator for which the resistance and the mass are in series. in-parallel resonators serve to enhance the acoustic absorption for mid-frequencies thereby extending the active frequency range of perfect acoustic absorbers. two implementations of these in-parallel absorbers are presented and investigated experimentally as well as numerically. In the first demonstration, the resistance is a perforated plate with a wiremesh and the oscillating mass is the air that fills a tube passing through the plate. The second implementation consists of a thin flexible beam that oscillates and where the resistance is due to the micro-slit resulting from the cutting of the beam.
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Soumis le : mardi 29 octobre 2019 - 11:14:37
Dernière modification le : mardi 12 novembre 2019 - 17:38:02

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Yves Aurégan, Maaz Farooqui. In-parallel resonators to increase the absorption of subwavelength acoustic absorbers in the mid-frequency range. Scientific Reports, Nature Publishing Group, 2019, 9 (1), ⟨10.1038/s41598-019-47516-7⟩. ⟨hal-02336978⟩

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