组元厚度结构对层状声子晶体导带的影响  

Effect of Component Thickness Structure on Layered Phononic Crystal Conduct Band

作　　者：唐启祥[1] 邱学云[1] 胡家光[1] 

机构地区：[1]文山学院信息科学学院,云南文山663099

出　　处：《大理大学学报》2016年第6期23-26,共4页Journal of Dali University

基　　金：云南省教育厅科学研究基金资助项目(2014Y474)

摘　　要：以三组元层状声子晶体为例,采用一定的中心频率确定各组元的中心波长,以各组元中心波长的倍数为该组元的厚度系数,以不同组元与某一组元的厚度系数之比为相应的厚度系数比,采用传输矩阵法计算传输特性,研究了不同厚度系数、厚度系数比及原胞数对声子晶体的传输特性的影响。结果显示,导带分布具有非常完美的对称性,且每个导带的频率中心值、导带宽度以及相邻导带频率中心的间隔均随厚度系数及厚度系数比的变化呈现明显的变化规律,而与原胞数无关。Choosing a central frequency to calculate the central wavelength of every component, and determining every component＇s thickness coefficients with ratios of their central wavelength, and defining each component＇s ratio of thickness coefficient with a certain component＇s thickness coefficient, and the transmission characteristics of the three components phononic crystal were calculated with transfer matrix method for different thickness coefficient and ratio of thickness coefficient. The results show that the distribution of the conduction band presents very perfect symmetry. With the changing of the thickness coefficient and the thickness coefficient ratio, all of the frequency center of the conduction band and the conduction band width and the center of the adjacent conduction band frequency interval present obvious regularity, but there is nothing to do with the changing of the original cell number.

关 键 词：声子晶体 导带 中心波长 厚度系数 厚度系数比 

分 类 号：TH113[机械工程—机械设计及理论]