Compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials
Acoustic rainbow trappers, based on frequency selective structures with graded geometries and/or properties, can filter mechanical waves spectrally and spatially to reduce noise and interference in receivers. These structures are especially useful as passive, always-on sensors in applications such a...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Online Access: | https://hdl.handle.net/10356/105830 http://hdl.handle.net/10220/48781 |
| _version_ | 1811676647704756224 |
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| author | Zhao, Liuxian Zhou, Shengxi |
| author2 | Temasek Laboratories |
| author_facet | Temasek Laboratories Zhao, Liuxian Zhou, Shengxi |
| author_sort | Zhao, Liuxian |
| collection | NTU |
| description | Acoustic rainbow trappers, based on frequency selective structures with graded geometries and/or properties, can filter mechanical waves spectrally and spatially to reduce noise and interference in receivers. These structures are especially useful as passive, always-on sensors in applications such as structural health monitoring. For devices that face space and weight constraints, such as microelectromechanical systems (MEMS) transducers and artificial cochleae, the rainbow trapping structures must be compact as well. To address this requirement, we investigated the frequency selection properties of a space-saving design consisting of Helmholtz resonators arranged at sub-wavelength intervals along a cochlear-inspired spiral tube. The height of the Helmholtz resonators was varied gradually, which induced bandgap formation at different frequencies along the length of the spiral tube. Numerical simulations and experimental measurements of acoustic wave propagation through the structure showed that frequencies in the range of 1–10 kHz were transmitted to different extents along the spiral tube. These rainbow trapping results were achieved with a footprint that was up to 70 times smaller than the previous structures operating at similar bandwidths, and the channels are 2.5 times of the previous structures operating at similar bandwidths. |
| first_indexed | 2024-10-01T02:24:48Z |
| format | Journal Article |
| id | ntu-10356/105830 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:24:48Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1058302020-09-26T22:16:16Z Compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials Zhao, Liuxian Zhou, Shengxi Temasek Laboratories Acoustic Rainbow Trapping Artificial Cochleae DRNTU::Science::Physics Acoustic rainbow trappers, based on frequency selective structures with graded geometries and/or properties, can filter mechanical waves spectrally and spatially to reduce noise and interference in receivers. These structures are especially useful as passive, always-on sensors in applications such as structural health monitoring. For devices that face space and weight constraints, such as microelectromechanical systems (MEMS) transducers and artificial cochleae, the rainbow trapping structures must be compact as well. To address this requirement, we investigated the frequency selection properties of a space-saving design consisting of Helmholtz resonators arranged at sub-wavelength intervals along a cochlear-inspired spiral tube. The height of the Helmholtz resonators was varied gradually, which induced bandgap formation at different frequencies along the length of the spiral tube. Numerical simulations and experimental measurements of acoustic wave propagation through the structure showed that frequencies in the range of 1–10 kHz were transmitted to different extents along the spiral tube. These rainbow trapping results were achieved with a footprint that was up to 70 times smaller than the previous structures operating at similar bandwidths, and the channels are 2.5 times of the previous structures operating at similar bandwidths. Published version 2019-06-14T08:07:48Z 2019-12-06T21:58:49Z 2019-06-14T08:07:48Z 2019-12-06T21:58:49Z 2019 Journal Article Zhao, L., & Zhou, S. (2019). Compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials. Sensors, 19(4), 788-. doi:10.3390/s19040788 1424-8220 https://hdl.handle.net/10356/105830 http://hdl.handle.net/10220/48781 10.3390/s19040788 en Sensors © 2019 The Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). 11 p. application/pdf |
| spellingShingle | Acoustic Rainbow Trapping Artificial Cochleae DRNTU::Science::Physics Zhao, Liuxian Zhou, Shengxi Compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials |
| title | Compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials |
| title_full | Compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials |
| title_fullStr | Compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials |
| title_full_unstemmed | Compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials |
| title_short | Compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials |
| title_sort | compact acoustic rainbow trapping in a bioinspired spiral array of graded locally resonant metamaterials |
| topic | Acoustic Rainbow Trapping Artificial Cochleae DRNTU::Science::Physics |
| url | https://hdl.handle.net/10356/105830 http://hdl.handle.net/10220/48781 |
| work_keys_str_mv | AT zhaoliuxian compactacousticrainbowtrappinginabioinspiredspiralarrayofgradedlocallyresonantmetamaterials AT zhoushengxi compactacousticrainbowtrappinginabioinspiredspiralarrayofgradedlocallyresonantmetamaterials |