Robust large-area elastic transverse wave transport in active acoustic metamaterials
We investigate robust large-area elastic transverse wave propagation in an actively tunable membrane-type acoustic metamaterial. The waveguide with multiple degrees of freedom to control the width of the interface mode is realized by designing a heterostructure including three domains. One central d...
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sg-ntu-dr.10356-1612442022-08-22T06:16:08Z Robust large-area elastic transverse wave transport in active acoustic metamaterials Chen, Zhenyu Wang, Xiangyu Lim, C. W. Shi, Fan School of Civil and Environmental Engineering Engineering::Civil engineering Acoustic Metamaterial Interfaces State We investigate robust large-area elastic transverse wave propagation in an actively tunable membrane-type acoustic metamaterial. The waveguide with multiple degrees of freedom to control the width of the interface mode is realized by designing a heterostructure including three domains. One central domain is constructed by periodic unit cells in an ordinary state, where a Dirac cone can be observed in the band structure. The other two domains consist of periodic unit cells possessing opposite valley Chern numbers, respectively. By employing a finite element model, the topologically protected interface states with tunable degrees of freedom are exhibited. The energy of interface states distributes equally in the large-central region. Although a larger degree of freedom leads to lower amplitudes of interface states, larger total energy is demonstrated by defining a quality factor. Moreover, we design several waveguides with straight lines and sharp corners with different angles and denote three different notations to show clearly that the large-area transverse wave can propagate robustly through sharp corners. Finally, it is found that the large-area transverse wave transport shows immunity to disorders and defects in the propagation path. Published version 2022-08-22T06:16:08Z 2022-08-22T06:16:08Z 2022 Journal Article Chen, Z., Wang, X., Lim, C. W. & Shi, F. (2022). Robust large-area elastic transverse wave transport in active acoustic metamaterials. Journal of Applied Physics, 131(18), 185112-. https://dx.doi.org/10.1063/5.0087988 0021-8979 https://hdl.handle.net/10356/161244 10.1063/5.0087988 2-s2.0-85130093257 18 131 185112 en Journal of Applied Physics © 2022 Author(s). All rights reserved. This paper was published by AIP Publishing in Journal of Applied Physics and is made available with permission of Author(s). application/pdf |
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Engineering::Civil engineering Acoustic Metamaterial Interfaces State Chen, Zhenyu Wang, Xiangyu Lim, C. W. Shi, Fan Robust large-area elastic transverse wave transport in active acoustic metamaterials |
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We investigate robust large-area elastic transverse wave propagation in an actively tunable membrane-type acoustic metamaterial. The waveguide with multiple degrees of freedom to control the width of the interface mode is realized by designing a heterostructure including three domains. One central domain is constructed by periodic unit cells in an ordinary state, where a Dirac cone can be observed in the band structure. The other two domains consist of periodic unit cells possessing opposite valley Chern numbers, respectively. By employing a finite element model, the topologically protected interface states with tunable degrees of freedom are exhibited. The energy of interface states distributes equally in the large-central region. Although a larger degree of freedom leads to lower amplitudes of interface states, larger total energy is demonstrated by defining a quality factor. Moreover, we design several waveguides with straight lines and sharp corners with different angles and denote three different notations to show clearly that the large-area transverse wave can propagate robustly through sharp corners. Finally, it is found that the large-area transverse wave transport shows immunity to disorders and defects in the propagation path. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Chen, Zhenyu Wang, Xiangyu Lim, C. W. Shi, Fan |
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Article |
author |
Chen, Zhenyu Wang, Xiangyu Lim, C. W. Shi, Fan |
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Chen, Zhenyu |
title |
Robust large-area elastic transverse wave transport in active acoustic metamaterials |
title_short |
Robust large-area elastic transverse wave transport in active acoustic metamaterials |
title_full |
Robust large-area elastic transverse wave transport in active acoustic metamaterials |
title_fullStr |
Robust large-area elastic transverse wave transport in active acoustic metamaterials |
title_full_unstemmed |
Robust large-area elastic transverse wave transport in active acoustic metamaterials |
title_sort |
robust large-area elastic transverse wave transport in active acoustic metamaterials |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/161244 |
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1743119505850105856 |