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• W4377011758 abstract "In this work, an ultrathin acoustic metamaterial formed by space-coiled water channels with a rubber coating is proposed for underwater sound absorption. The proposed metamaterial achieves perfect sound absorption ([Formula: see text] > 0.99) at 181 Hz, which has a deep subwavelength thickness ([Formula: see text]). The theoretical prediction is consistent with the numerical simulation, which demonstrate the broadband low-frequency sound absorption performance of the proposed super absorber. The introduction of rubber coating leads to a significant decrease of the effective sound speed in the water channel, resulting in the phenomenon of slow-sound propagation. From the perspective of numerical simulations and acoustic impedance analysis, it is proved that the rubber coating on the channel boundary causes slow-sound propagation with inherent dissipation, which is the key to meet the impedance matching condition and achieve perfect low-frequency sound absorption. Parametric studies are also carried out to investigate the effect of specific structural and material parameters on sound absorption. By tailoring key geometric parameters, an ultra-broadband underwater sound absorber is constructed, with a perfect absorption range of 365-900 Hz and a deep subwavelength thickness of 33 mm. This work paves a new way for designing underwater acoustic metamaterials and controlling underwater acoustic waves." @default.
• W4377011758 created "2023-05-19" @default.
• W4377011758 creator A5038346885 @default.
• W4377011758 creator A5052675433 @default.
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• W4377011758 date "2023-05-17" @default.
• W4377011758 modified "2023-09-30" @default.
• W4377011758 title "Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound" @default.
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• W4377011758 doi "https://doi.org/10.1038/s41598-023-34993-0" @default.
• W4377011758 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37198226" @default.
• W4377011758 hasPublicationYear "2023" @default.
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