期刊
JOURNAL OF SOUND AND VIBRATION
卷 530, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2022.116945
关键词
Broadband vibration; Rainbow effect; Flat bands; Zigzag metamaterial beams; 3D-printing
资金
- National Natural Science Foundation of China [12072051, 11632004, U1864208]
- Venture and Innovation Support Program for Chongqing Overseas Returnees [cx2018050]
- Fundamental Research Funds for the Central Universities [300102251513]
- National Science and Technology Major Project [2017-VII-0011-0106]
- Science and Technology Planning Project of Tianjin [20ZYJDJC00030]
- China Scholarship Council (CSC) [201806055009]
Rainbow metamaterials, consisting of a gradient zigzag metamaterial beam design with flat band structures, can be used as broadband vibration isolators for beam-like structures.
Unlike conventional metamaterials with a periodic array of identical resonators, rainbow meta-materials consist of an array of discrete resonators with a spatially varying parameter, yielding a wide attenuation band gap. In this research, a particular kind of gradient zigzag metamaterial beam with rainbow effects is proposed with the gradual height change of pi-shaped unit cells in the metamaterial beams. The calculated real and complex band structures using the finite element method (FEM) and the spectral element method (SEM) show the very different characteristics of our gradient zigzag metamaterial beams. Their band structures are exclusively composed of flat bands caused by the local resonance of certain parts in the gradient zigzag metamaterial beams within a broad frequency range. As a result, our proposed gradient zigzag metamaterial beams can be used as broadband vibration isolators for beam-like structures, supported by both the numerical simulations and experiments conducted on the 3D-printed samples. In addition, our gradient zigzag metamaterial beams allow for wave reciprocity, and the disorder of unit cell heights has a negative effect on the widening of the attenuation band gap. This design strategy opens a new avenue for designing and constructing novel broadband vibration isolators.
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