Multi-Order Asymmetric Acoustic Metamaterials with Broad Bandgaps at Subwavelength Scales
Noise manipulation at the subwavelength scale remains a challenging problem. To obtain better broadband sound isolation within the subwavelength range, a class of asymmetric acoustic metamaterials (AAMs) based on rotation is proposed, and this class of AAMs can further improve subwavelength sound is...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/24/7587 |
| _version_ | 1797380187662319616 |
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| author | Xiaopeng Wang Wenjiong Chen Sheng Li |
| author_facet | Xiaopeng Wang Wenjiong Chen Sheng Li |
| author_sort | Xiaopeng Wang |
| collection | DOAJ |
| description | Noise manipulation at the subwavelength scale remains a challenging problem. To obtain better broadband sound isolation within the subwavelength range, a class of asymmetric acoustic metamaterials (AAMs) based on rotation is proposed, and this class of AAMs can further improve subwavelength sound isolation performance by introducing multi-orders. The influences of changing the alternate propagation length of the coiled channel and the square cavity in the unit cell on the band frequency distribution and the omnidirectional band structure were investigated. The effective parameters are calculated with the S-parameter retrieval method, and the generation and change mechanisms of the bandgaps were elucidated. The calculation of sound transmission characteristics showed that, in the asymmetric mode, the overall sound isolation performance of the structure was greatly improved, and the relative bandwidth expanded as the alternate propagation length of the coiled channel and square cavity increased. The omnidirectional bandgaps from the first-order to the third-order AAMs occupied 63.6%, 75.96%, and 76.84% of the subwavelength range, respectively. In particular, the first bandgap moves to the low frequency and becomes wider. Both the experimental results and numerical analyses consistently showed that disrupting structural symmetry enhances acoustic metamaterials for superior broadband sound isolation, inspiring broader applications for asymmetry in this field. |
| first_indexed | 2024-03-08T20:33:44Z |
| format | Article |
| id | doaj.art-42b550083c12450489157aebe537fa57 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T20:33:44Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-42b550083c12450489157aebe537fa572023-12-22T14:22:44ZengMDPI AGMaterials1996-19442023-12-011624758710.3390/ma16247587Multi-Order Asymmetric Acoustic Metamaterials with Broad Bandgaps at Subwavelength ScalesXiaopeng Wang0Wenjiong Chen1Sheng Li2State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, Dalian University of Technology, Dalian 116024, ChinaState Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, Dalian University of Technology, Dalian 116024, ChinaState Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, Dalian University of Technology, Dalian 116024, ChinaNoise manipulation at the subwavelength scale remains a challenging problem. To obtain better broadband sound isolation within the subwavelength range, a class of asymmetric acoustic metamaterials (AAMs) based on rotation is proposed, and this class of AAMs can further improve subwavelength sound isolation performance by introducing multi-orders. The influences of changing the alternate propagation length of the coiled channel and the square cavity in the unit cell on the band frequency distribution and the omnidirectional band structure were investigated. The effective parameters are calculated with the S-parameter retrieval method, and the generation and change mechanisms of the bandgaps were elucidated. The calculation of sound transmission characteristics showed that, in the asymmetric mode, the overall sound isolation performance of the structure was greatly improved, and the relative bandwidth expanded as the alternate propagation length of the coiled channel and square cavity increased. The omnidirectional bandgaps from the first-order to the third-order AAMs occupied 63.6%, 75.96%, and 76.84% of the subwavelength range, respectively. In particular, the first bandgap moves to the low frequency and becomes wider. Both the experimental results and numerical analyses consistently showed that disrupting structural symmetry enhances acoustic metamaterials for superior broadband sound isolation, inspiring broader applications for asymmetry in this field.https://www.mdpi.com/1996-1944/16/24/7587broad bandgapmulti-orderasymmetricacoustic metamaterials |
| spellingShingle | Xiaopeng Wang Wenjiong Chen Sheng Li Multi-Order Asymmetric Acoustic Metamaterials with Broad Bandgaps at Subwavelength Scales Materials broad bandgap multi-order asymmetric acoustic metamaterials |
| title | Multi-Order Asymmetric Acoustic Metamaterials with Broad Bandgaps at Subwavelength Scales |
| title_full | Multi-Order Asymmetric Acoustic Metamaterials with Broad Bandgaps at Subwavelength Scales |
| title_fullStr | Multi-Order Asymmetric Acoustic Metamaterials with Broad Bandgaps at Subwavelength Scales |
| title_full_unstemmed | Multi-Order Asymmetric Acoustic Metamaterials with Broad Bandgaps at Subwavelength Scales |
| title_short | Multi-Order Asymmetric Acoustic Metamaterials with Broad Bandgaps at Subwavelength Scales |
| title_sort | multi order asymmetric acoustic metamaterials with broad bandgaps at subwavelength scales |
| topic | broad bandgap multi-order asymmetric acoustic metamaterials |
| url | https://www.mdpi.com/1996-1944/16/24/7587 |
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