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Coherent perfect absorption induced by the nonlinearity of a Helmholtz resonator

Abstract : In this work, coherent perfect absorption of sound waves induced by the nonlinear response of a Helmholtz Resonator side loaded to a waveguide, is reported. It is shown that this two-port system can perfectly absorb two high amplitude symmetric incident waves under a certain condition. For the one-sided incidence configuration, this condition leads to an absorption equal to 0.5. Experiments verify these results and are in agreement with an analytical nonlinear impedance model for the resonator. The nonlinear control of perfect absorption opens new possibilities in the design of high amplitude sound attenuators for aero-engine applications.
Keywords : IMPEDANCE TUBE
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https://hal.archives-ouvertes.fr/hal-02406981
Contributeur : Olivier Richoux <>
Soumis le : jeudi 12 décembre 2019 - 12:05:37
Dernière modification le : jeudi 7 janvier 2021 - 15:56:02

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V. Achilleos, Olivier Richoux, G. Theocharis. Coherent perfect absorption induced by the nonlinearity of a Helmholtz resonator. Journal of the Acoustical Society of America, Acoustical Society of America, 2016, 140 (1), pp.EL94-EL100. ⟨10.1121/1.4954869⟩. ⟨hal-02406981⟩

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