Abstract

For the control of low-frequency noise in complex external-pressure environment, a new two-dimensional phononic crystal plate which is made of the lead stub with rubber coatings connected by narrow epoxy bars is proposed and the bandgap characteristics are simulated tentatively by the finite element method. The bandgap generation mechanism of the designed model is investigated by analyzing corresponding vibration modes. Furthermore, the bandgap adjustability under different pre-compression strains and geometric parameters is also investigated. Results show that obvious bandgaps tunability with small pre-compression strains or hydrostatic pressure is realized by changing geometric parameters and applying pre-compression strain to the matrix.

摘要

为控制复杂外压环境下的低频噪声，提出了一种新型二维声子晶体板，其由带橡胶涂层的引线短棒通过环氧树脂窄条连接而成，并采用有限元法对带隙特性进行了初步模拟。元法。通过分析相应的振动模式，研究了设计模型的带隙产生机制。此外，还研究了不同预压缩应变和几何参数下的带隙可调性。结果表明，通过改变几何参数和对基体施加预压缩应变，可以实现具有较小预压缩应变或静水压力的明显带隙可调性。