Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound
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 ( $$\alpha$$ α > 0.99) at 181 Hz, which has a deep subwavelength thicknes...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2023-05-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-34993-0 |
| _version_ | 1797822913440645120 |
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| author | Xindong Zhou Xiaochen Wang Fengxian Xin |
| author_facet | Xindong Zhou Xiaochen Wang Fengxian Xin |
| author_sort | Xindong Zhou |
| collection | DOAJ |
| description | 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 ( $$\alpha$$ α > 0.99) at 181 Hz, which has a deep subwavelength thickness ( $$\lambda {/}162$$ λ / 162 ). 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. |
| first_indexed | 2024-03-13T10:15:18Z |
| format | Article |
| id | doaj.art-eace5c7838dd4edbbb395153db54b377 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-13T10:15:18Z |
| publishDate | 2023-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-eace5c7838dd4edbbb395153db54b3772023-05-21T11:16:59ZengNature PortfolioScientific Reports2045-23222023-05-0113111010.1038/s41598-023-34993-0Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater soundXindong Zhou0Xiaochen Wang1Fengxian Xin2State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong UniversityState Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong UniversityState Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong UniversityAbstract 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 ( $$\alpha$$ α > 0.99) at 181 Hz, which has a deep subwavelength thickness ( $$\lambda {/}162$$ λ / 162 ). 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.https://doi.org/10.1038/s41598-023-34993-0 |
| spellingShingle | Xindong Zhou Xiaochen Wang Fengxian Xin Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound Scientific Reports |
| 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 |
| url | https://doi.org/10.1038/s41598-023-34993-0 |
| work_keys_str_mv | AT xindongzhou ultrathinacousticmetamaterialassuperabsorberforbroadbandlowfrequencyunderwatersound AT xiaochenwang ultrathinacousticmetamaterialassuperabsorberforbroadbandlowfrequencyunderwatersound AT fengxianxin ultrathinacousticmetamaterialassuperabsorberforbroadbandlowfrequencyunderwatersound |