期刊
JOURNAL OF SOUND AND VIBRATION
卷 502, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2021.116102
关键词
Periodic plates; Complete sub-wavelength band gaps; Acoustic black hole; Vibration attenuation; Flexural waves
资金
- National Science Foundation of China [11902260, 11532006, 11974287]
- China Postdoctoral Science Foundation [260456]
- Fundamental Research Funds for the Central Universities [3102019HHZY03001]
- Research Grant Council of the Hong Kong SAR [PolyU 152017/17E]
The study proposes a new type of plate structure containing periodically arranged double-layer ABH cells, which provide complete and omnidirectional band gaps. By adjusting ABH parameters and enhancing Bragg scattering, the band gap frequencies can be widened and lowered.
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 configura-tion. 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 experi-mentally 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. (c) 2021 Elsevier Ltd. All rights reserved.
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