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Optimally graded porous material for broadband perfect absorption of sound

Abstract : This article presents a numerical optimization procedure of continuous gradient porous layer properties to achieve perfect absorption under normal incidence. This design tool is applied on a graded porous medium composed of a periodic arrangement of ordered unit cells allowing to link the effective acoustic properties to its geometry. The best micro-geometry continuous gradient providing the optimal acoustic reflection and/or transmission is designed via a nonlinear conjugate gradient algorithm. The acoustic performances of the so-designed continuous graded material are discussed with respect to the optimized homogeneous, i.e. non-graded, and monotonically graded material. The numerical results show a shifting of the perfect absorption peak to lower frequencies or a widening of the perfect absorption frequency range for graded materials when compared to uniform ones. The results are validated experimentally on 3D-printed samples therefore confirming the relevance of such gradient along with the efficiency of the control of the entire design process. a) jean.boulvert@univ-lemans.fr;
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https://hal.archives-ouvertes.fr/hal-02366295
Contributor : Vicente Romero Garcia Connect in order to contact the contributor
Submitted on : Friday, November 15, 2019 - 6:18:21 PM
Last modification on : Wednesday, March 3, 2021 - 4:09:36 AM
Long-term archiving on: : Sunday, February 16, 2020 - 7:19:26 PM

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Jean Boulvert, Théo Cavalieri, Josué Costa-Baptista, Logan Schwan, Vicente Romero-García, et al.. Optimally graded porous material for broadband perfect absorption of sound. Journal of Applied Physics, 2019, 126 (17), pp.175101. ⟨10.1063/1.5119715⟩. ⟨hal-02366295⟩

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