期刊
PHYSICAL REVIEW APPLIED
卷 14, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.14.054055
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资金
- Agence Nationale de la Recherche (ANR) - Research Grants Council (RGC) METARoom project [ANR-18-CE08-0021]
- HYPERMETA project under the program Etoiles Montantes of the Region Pays de la Loire
- European Cooperation in Science and Technology (COST) Action DENORMS (Designs for Noise Reducing Materials and Structures) [CA15125]
- COST
- Spanish Ministry of Science, Innovation, and Universities (MICINN) through the grant Juan de la Cierva-Incorporacion [IJC2018-037897-I]
- Agence Nationale de la Recherche (ANR) [ANR-18-CE08-0021] Funding Source: Agence Nationale de la Recherche (ANR)
Mirror-symmetric acoustic metascreens producing perfect absorption independently of the incidence side are theoretically and experimentally reported in this work. The mirror-symmetric resonant building blocks of the metascreen support symmetric and antisymmetric resonances that can be tuned to be at the same frequency (degenerate resonances). The geometry of the building blocks is optimized to critically couple both the symmetric and the antisymmetric resonances at the same frequency, allowing perfect absorption of sound from both sides of the metascreen. A hybrid analytical model based on the transfer matrix method and the modal decomposition of the exterior acoustic field is developed to analyze the scattering properties of the metascreen. The resulting geometry is three-dimensionally printed and experimentally tested in an impedance tube. The experimental results agree well with the theoretical predictions, proving the efficiency of these metascreens for the perfect absorption of sound in ventilation problems.
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