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http://hdl.handle.net/10397/106295
Title: | Complete sub-wavelength flexural wave band gaps in plates with periodic acoustic black holes | Authors: | Tang, L Cheng, L Chen, K |
Issue Date: | 23-Jun-2021 | Source: | Journal of sound and vibration, 23 June 2021, v. 502, 116102 | Abstract: | Acoustic Black Hole (ABH) effect shows promise for vibration control, but mainly limited to a relatively high frequency range. Though achievable in 1D periodic ABH structures, complete sub-wavelength band gaps (BGs) have not yet been realized in 2D configuration. Capitalizing on the unique wave propagation characteristics of the ABH, we propose a new type of plates containing periodically arranged double-layer ABH cells which offer complete and omnidirectional BGs. The phenomena originate from the combined effects of the ABH-specific local resonances and Bragg scattering, which are made possible through a dual process: a proper channeling of the wave propagation path and an impaired coupling between the ABH-induced local resonances and the global vibration of the unit cells. The former is warranted by a proper structural tailoring of the unit cells and the latter by the dynamics of the double-layer ABH design. It is shown that the BGs can be tuned through adjusting ABH parameters. Meanwhile, attaching the centers of the double ABH branches with a connecting cylinder can further broaden and lower the frequencies of the BGs as a result of the enhanced Bragg scattering. It is also demonstrated numerically and experimentally that remarkable vibration attenuation and energy insulation can be achieved in a plate with only a small number of ABH cells, thus pointing at the possibility of achieving sub-wavelength vibration control in structures with reasonable dimensions. | Keywords: | Acoustic black hole Complete sub-wavelength band gaps Flexural waves Periodic plates Vibration attenuation |
Publisher: | Elsevier Ltd | Journal: | Journal of sound and vibration | ISSN: | 0022-460X | EISSN: | 1095-8568 | DOI: | 10.1016/j.jsv.2021.116102 | Rights: | © 2021 Elsevier Ltd. All rights reserved. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Tang, L., Cheng, L., & Chen, K. (2021). Complete sub-wavelength flexural wave band gaps in plates with periodic acoustic black holes. Journal of Sound and Vibration, 502, 116102 is available at https://doi.org/10.1016/j.jsv.2021.116102. |
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Cheng_Complete_Sub-Wavelength_Flexural.pdf | Pre-Published version | 2.93 MB | Adobe PDF | View/Open |
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