（32.4.3.4）晶格声子晶体的多点缺陷试验研究  

Experimental Investigation of Multiple Defect States in Two-dimensional Phononic Crystal with （32.4.3.4） Lattice

作　　者：赵寰宇[1] 汪越胜[1] 

机构地区：[1]北京交通大学工程力学研究所,北京100044

出　　处：《机械工程学报》2015年第8期14-19,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金(11302021);中央高校基本科研业务费专项(2014JBM097)资助项目

摘　　要：由于复式晶格能够降低结构对称性,使晶体比较容易打开多个完全带隙。设计有限尺寸新型多点缺陷形式的复式晶格声子晶体,可以形成宽频段声波的局域态和波导。通过试验研究二维(32.4.3.4)晶格钢/水声子晶体的Zigzag型多点缺陷性质,结合超胞技术,并利用有限元法数值计算该声子晶体缺陷体系的能带结构、本征模态和透射谱。结果表明:数值计算和试验结果符合较好。对Zigzag型多点缺陷分析可知,其数量和形式决定高频(或低频)带隙内声波局域效应、本征模态和波导特性。因此研究复式晶格声子晶体缺陷性质,丰富了调控声波传播的手段,为设计新型声波器件提供了重要的思路。It is easy to open some the complete band gaps for phononic crystals （PCs） since the symmetry reduces for the complex lattices. The properties of multiple point defects in a PC composed of a （32.4.3.4） array of circular steel cylinders in water are studied experimentally. The band structures of PCs with multiple defects of different zigzag types are computed by the finite element method with the supercell approximation. A good agreement between the numerical and experiment results is shown. The effects of the number of the multiple point defects of the Zigzag type decide on the localized modes, the eigonmodes and the waveguide in the band gaps of high or low frequencies are discussed. These defect studies of PCs with complex lattices can be further used to improve the design of new acoustic devices.

关 键 词：声子晶体 Zigzag型多点缺陷 (32.4.3.4)晶格 能带结构 透射谱 

分 类 号：TG535[金属学及工艺—金属切削加工及机床]