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Enhanced resonance of sparse arrays of Helmholtz resonators—Application to perfect absorption

Abstract : We inspect the influence of the spacing on the resonance of a periodic arrangement of Helmholtz resonators. An effective problem is used which captures accurately the properties of the resonant array within a large range of frequency, and whose simplified version leaves us with an impedance condition. It is shown that the strength of the resonance is enhanced when the array becomes sparser. This degree of freedom on the radiative damping is of particular interest since it does not affect the resonance frequency nor the damping due to losses within each resonator; besides, it does not affect the total thickness of the array. We show that it can be used for the design of a perfect absorbing walls.
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https://hal.inria.fr/hal-02381074
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Submitted on : Tuesday, November 26, 2019 - 2:48:01 PM
Last modification on : Friday, January 15, 2021 - 3:07:01 AM

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Agnès Maurel, Jean-François Mercier, Trung Kien Pham, J.-J Marigo, Abdelwaheb Ourir. Enhanced resonance of sparse arrays of Helmholtz resonators—Application to perfect absorption. Journal of the Acoustical Society of America, Acoustical Society of America, 2019, 145 (4), pp.2552-2560. ⟨10.1121/1.5098948⟩. ⟨hal-02381074⟩

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