Rapid additive manufacturing of optimized anisotropic metaporous surfaces for broadband absorption - Archive ouverte HAL
Article Dans Une Revue Journal of Applied Physics Année : 2021

Rapid additive manufacturing of optimized anisotropic metaporous surfaces for broadband absorption

Résumé

Porous materials and metamaterials play a key role in sound absorbing and insulation solutions in acoustics. With the growing interest in additive manufacturing techniques, recent work has focused on the printing of porous and resonant structures for acoustic purposes. Usual metaporous surfaces/interfaces are generally built by periodically inserting resonant elements in an existing porous layer. This complex manufacturing process can be significantly simplified by using additive manufacturing techniques, which also eases the design and optimization of the metaporous surface. In this work, the acoustic properties of the metaporous surface are controlled by simple geometric parameters defining both the anisotropic porous layer and the shapes of the resonators. Hence, we focus on optimizing split-ring resonators embedded in a micro-treillis porous layer, which are built in a single part using additive manufacturing techniques. A finite-element method together with Bloch wave decomposition provides a numerical model used to predict the reflection and absorption coefficients under normal incidence. The geometric parameters of the anisotropic metaporous surface are then optimized by non-linear minimization techniques to maximize acoustic absorption. An optimal metaporous surface is 3D printed by fused-deposition modeling, and its acoustic properties are measured in an impedance tube. The measurements are in good agreement with the predicted optimal broadband absorption coefficient. This work demonstrates the benefits of additive manufacturing for designing metaporous acoustic surfaces.
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Dates et versions

hal-03436126 , version 1 (22-11-2021)

Identifiants

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Théo Cavalieri, Jean Boulvert, Vicente Romero-García, Gwenael Gabard, Marie Escouflaire, et al.. Rapid additive manufacturing of optimized anisotropic metaporous surfaces for broadband absorption. Journal of Applied Physics, 2021, 129 (11), pp.115102. ⟨10.1063/5.0042563⟩. ⟨hal-03436126⟩
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