Acoustic Diode Metamaterial for Sound Absorption

Bennett, Gareth J.; Hossain, Robiul; McKay, Andrew; Ross, Eoghan P.

doi:10.2514/6.2019-2422

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2020

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“…In the literature, scientist are mainly focusing on trying to engineer the internal metamaterial's architecture following non-homogeneous patterns (see e.g. [6,7,20,21,22,28,35,41,42,48,49]) or non-elastic constitutive laws [38] so as to create these diodes.…”

Section: Introductionmentioning

confidence: 99%

Towards the conception of complex engineering meta-structures: relaxed-micromorphic modelling of low-frequency mechanical diodes/high-frequency screens

Rizzi¹,

Tallarico²,

Neff³

et al. 2020

Preprint

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In this paper we show that an enriched continuum model of the micromorphic type (Relaxed Micromorphic Model) can be safely used to model metamaterials' response in view of their use for meta-structural design. We focus on the fact that the reduced model's structure, coupled with the introduction of well-posed interface conditions, allows us to easily test different combinations of metamaterials' and classical-materials bricks, so that we can eventually end-up with the conception of a meta-structure acting as a mechanical diode for low/medium frequencies and as a total screen for higher frequencies. Thanks to the reduced model's structure, we are also able to optimize this meta-structure so that the diode-behaviour is enhanced for both "pressure" and "shear" incident waves and for all possible angles of incidence.

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