二维复合结构声子晶体的振动特性与实验研究

声子晶体可以获得低频带隙，抑制特定频率振动的传播。建立二维复合结构声子晶体的有限元模型，分析其传输特性，以得到各组元参数对带隙的起止频率及带宽的影响。分析声子晶体的各种材料参数、结构参数、周期数、排列方式等对带隙的影响。利用铝板、硅胶、钢片材料制作复合结构声子晶体样件，进行传输特性实验，得到的频率响应曲线与有限元仿真结果吻合很好。进而为声子晶体在中低频减振中的具体应用提供依据。

Theoretical and Experimental Study on Vibration Characteristics of Phononic Crystals with Two-dimensional Composite Structure

The low frequency band gap generated in phononic crystals can suppress vibration propagation with certain frequencies. In this article, the finite-element model of two-dimensional phononic crystals with a composite structure was established to analyze the transmission characteristics in order to learn the impact of the parameters of the c（ mponent elements on the initial and final frequencies of the band gap and bandwidth. The effects of the material parameters, the structural parameters, structural periodicity, arrangement of cells, etc., on the band gap were analyzed. Various phononic crystal specimens made up of aluminum, steel, silicone, etc. were prepared and the experiments for their transmission characteristics analysis were done. Results of frequency response curves of these specimens in the experiments were in good agreement with those from the finite element simulation. This work has provided reference data for the application of phononic crystals to the low-frequency vibration reduction.