Design of vibration isolators by using the Bragg scattering and local resonance band gaps in a layered honeycomb meta-structure
Design of vibration isolators by using the Bragg scattering and local resonance band gaps in a layered honeycomb meta-structure
复制标题
利用层状蜂窝元结构中的布拉格散射和局部共振带隙设计隔振器
DOI：
10.1016/j.jsv.2021.116721
复制
发表时间：
2021-12-24
影响因子：
4.7
通讯作者：
Luo, Bailu
中科院分区：
文献类型：
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作者：
Jin, Yang;Jia, Xin-Yu;Luo, Bailu
在这项研究中，利用分层蜂窝元结构中的布拉格散射和局部谐振带隙设计了一种隔振器。利用声子晶体超材料中的带隙，人们对工程结构的噪声和振动问题进行了各种研究。然而，由于声子晶体超材料具有较大的晶格常数和较窄的禁带宽度，目前还没有将其应用于隔振器设计的研究报道。为了克服在隔振器中实现的困难，本研究提出了一种分层蜂窝元结构。所提出的元结构包括一个分层的正方形蜂窝结构和一个局部谐振器内的蜂窝芯。基于有效质量的传输矩阵模型被发展来理解带隙形成的机制。在此基础上，建立了超宽低频耦合带隙的设计策略。然后，基于所提出的设计策略，设计并制作了一个四层蜂窝元结构。实验结果表明，通过引入精心选择的谐振器参数，成功地实现了超宽耦合带隙。最后，将所设计的元结构应用于某型隔振器，并通过实验验证了其隔振性能。该工作具有广阔的工程应用前景，对推动弹性波超材料在工程领域的实施具有重要意义。
In this study, a vibration isolator is designed using the Bragg scattering and local resonance band gaps in a layered honeycomb meta-structure. Various studies have been conducted on the noise and vibration problems of engineering structures by utilizing the band gaps in phononic crystal meta-materials. However, no study on the application of phononic crystal meta-materials to the design of vibration isolators has been published due to the large lattice constant and narrow band gap. To overcome the difficulties of realization in vibration isolators, a layered honeycomb metastructure is proposed in this study. The proposed meta-structure consists of a layered square honeycomb structure and a local resonator placed inside the honeycomb core. A transfer matrix model based on the effective mass is developed to comprehend the mechanism of band gap formation. Furthermore, a strategy for designing an ultra-wide low-frequency coupled band gap is established analytically. Then, a four-layer honeycomb meta-structure is designed and fabricated based on the proposed design strategy. Experimental results demonstrate the successful realization of an ultra-wide coupled band gap with the introduction of the resonators with meticulously selected parameters. Finally, the designed meta-structure is applied to a vibration isolator, and the vibration isolation performance is verified experimentally. This work has broad engineering application prospects and is of high significance for promoting the implementation of elastic wave meta-materials in the engineering field.