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Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound

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 (...

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Detalles Bibliográficos
Autores principales: Zhou, Xindong, Wang, Xiaochen, Xin, Fengxian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10192347/
https://www.ncbi.nlm.nih.gov/pubmed/37198226
http://dx.doi.org/10.1038/s41598-023-34993-0
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author Zhou, Xindong
Wang, Xiaochen
Xin, Fengxian
author_facet Zhou, Xindong
Wang, Xiaochen
Xin, Fengxian
author_sort Zhou, Xindong
collection PubMed
description 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.
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spelling pubmed-101923472023-05-19 Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound Zhou, Xindong Wang, Xiaochen Xin, Fengxian Sci Rep Article 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. Nature Publishing Group UK 2023-05-17 /pmc/articles/PMC10192347/ /pubmed/37198226 http://dx.doi.org/10.1038/s41598-023-34993-0 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Zhou, Xindong
Wang, Xiaochen
Xin, Fengxian
Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound
title Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound
title_full Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound
title_fullStr Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound
title_full_unstemmed Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound
title_short Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound
title_sort ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10192347/
https://www.ncbi.nlm.nih.gov/pubmed/37198226
http://dx.doi.org/10.1038/s41598-023-34993-0
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