The low-frequency vibration isolation of a new hybrid phononic crystal plate are numerically and experimentally demonstrated in this paper. The proposed structure is composed of two types of periodic double-sided composite resonators deposited on a two-component plate. The dispersion relations, transmission spectra, and displacement fields of the eigenmodes are calculated by the finite element method. Compared to the classical phononic plate, the proposed structure can generate multiple flexural and longitudinal band gaps (BGs) at low frequencies. The formation mechanisms of the BGs can be explained by the corresponding “analogous-rigid modes”. The results of the parametric analyses show that the BGs can be significantly modulated by adjusting the material and geometric parameters. Furthermore, shake tests on a fabricated specimen were performed to verify the attenuation performance for elastic waves of specific frequency ranges. This research indicates that the proposed structure is a promising option for broadband low-frequency vibration insulation.

本文通过数值和实验证明了新型混合声子晶体板的低频振动隔离。所提出的结构由沉积在双组件板上的两种类型的周期性双面复合谐振器组成。本征模的色散关系、透射谱和位移场是通过有限元方法计算出来的。与经典的声子板相比，所提出的结构可以在低频下产生多个弯曲和纵向带隙（BG）。BGs 的形成机制可以用相应的“模拟刚性模式”来解释。参数分析的结果表明，可以通过调整材料和几何参数来显着调节 BG。此外，对制造的样本进行了振动测试，以验证特定频率范围的弹性波的衰减性能。这项研究表明，所提出的结构是宽带低频隔振的有前途的选择。