Sound absorption performance of a labyrinthine metamaterial with arbitrary cross-sectional microperforations

Studies on acoustic metamaterials (AMM) with coiled spaces as a solution for low-medium frequency sound absorption are regularly presented. However, the influence of panel microperforation shapes on the behavior of these absorbers is not discussed in detail in the current literature. In this work, t...

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Bibliographic Details
Published in:Journal of the Brazilian Society of Mechanical Sciences and Engineering 2023-11, Vol.45 (11), Article 607
Main Authors: Almeida, Gildean do N., Vergara, Erasmo F., Barbosa, Leandro R., Lenzi, Arcanjo, Cassettari, Iago, Mikulski, Robson Z.
Format: Article
Language:English
Subjects:
Absorption
Bandwidths
Boundary layers
Energy dissipation
Engineering
Finite element method
Mathematical analysis
Mechanical Engineering
Metamaterials
Sound transmission
Technical Paper
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Summary:Studies on acoustic metamaterials (AMM) with coiled spaces as a solution for low-medium frequency sound absorption are regularly presented. However, the influence of panel microperforation shapes on the behavior of these absorbers is not discussed in detail in the current literature. In this work, the acoustic performance of a labyrinthine AMM with slit, square and circular microperforations, with similar cross-sectional area perforation, is discussed theoretically, numerically and experimentally in terms of the bandwidth around the maximum sound absorption for the frequency tuning. The impedance tube results of AMM with slit and square microperforations presented an increase of 33.9% and 14.3% absorption bandwidth compared to circular perforation. The increase in the absorption bandwidth in these microperforations is due to the greater energy dissipation in their viscous boundary layer as demonstrated by finite element computational simulation. In addition, slit and square microperforations are more susceptible to the effect of variation in the cross-sectional area of the perforations, ensuring greater absorption bandwidth throughout its variation. Finally, this work contributes to understanding the interference of microperforation shapes under the bandwidth of sound absorption in the AMM with coiled-up spaces.
ISSN:1678-5878
1806-3691
DOI:10.1007/s40430-023-04508-z