声波在二维固/流声子晶体中的禁带特性研究  

Acoustic band gaps in finite-sized two-dimensional solid/fluid phononic crystals

作　　者：高国钦[1] 马守林[1] 金峰[2] 金东范[2] 卢天健[2] 

机构地区：[1]西安交通大学机械学院,西安710049 [2]西安交通大学强度与振动教育部重点实验室,西安710049

出　　处：《物理学报》2010年第1期393-400,共8页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(973)项目(批准号:2006CB601202);国家自然科学基金(批准号:10632060);国家高技术研究发展计划(863)(批准号:2006AA03Z519);国家"111"引智计划项目(批准号:B06024);教育部新世纪优秀人才支持计划(批准号:NCET-08-0429)资助的课题~~

摘　　要：采用时域有限差分法(FDTD),分析了声波在二维四方点阵铝/空气组合声子晶体中的禁带特性,并利用实验测试验证了理论分析的正确性.在此基础上研究了两种不同声阻抗率比固(实心圆柱和空心圆管)/流系统声子晶体的禁带特性.对于实心圆柱体,分析了有限尺寸结构声子晶体在传播方向上的层数对声波传播特性的影响,得到了这两种系统在不同填充率下取得最大声波禁带宽度所需的最少层数.同时指出,在低声阻抗率比条件下,对于空心圆管填充物,通过选取适当的半径比,可以获得比实心柱体更宽的方向带隙.Acoustic band gaps in two-dimensional phononic crystal consisting of a finite-sized square array of parallel hollow aluminum cylinders in air are investigated with the finite difference time domain （FDTD） method. Experimental measurements were carried out to validate the theoretical predictions with excellent overall agreement achieved. The numerical method is used subsequently to study the band gap properties of phononic crystals composed of cylinder （both solid and hollow）/fluid systems for two different acoustic impedance ratios. For both types of system, the influence of the transverse size of the phononic crystal on the propagation properties is analyzed, and the minimum size to achieve the largest band gap width for different filling factors is determined.

关 键 词：声子晶体 时域有限差分法 禁带 声阻抗率比 

分 类 号：O481[理学—固体物理]