弹性波在对称准周期结构固/液声子晶体中的传播  

Propagation of elastic wave in a symmetrical quasi-periodic phononic crystal composed of solid /liquid

作　　者：肖绪洋[1] 陈润平[1] 夏继宏[1] 席锋[2] 

机构地区：[1]重庆文理学院电子电气工程学院,重庆永川402160 [2]重庆工商大学计算机科学与信息工程学院,重庆400067

出　　处：《振动与冲击》2014年第15期114-118,共5页Journal of Vibration and Shock

基　　金：重庆文理学院项目(Y2012DQ46)

摘　　要：基于准周期Fibonacci序列,提出了一维对称准周期序列固液介质声子晶体。利用传输矩阵法,数值研究了弹性波在其中的透射特性,以及局域谐振模的基本特征。弹性波正入射时,对低序列声子晶体,在声子带隙的中心频率处出现局域谐振模,且在其左右对称地出现两条局域谐振模。在较高序列结构的声子晶体中,仅在中心频率处出现一条局域谐振模。当弹性波斜入射时,声子带隙和谐振模都略微向高频方向移动。弹性波以较大角度斜入射时,只有低频弹性波透射。On basis of quasi-periodic Fibonacci sequence,a symmetrical quasi-periodic phononic crystal composed of solid and liquid medium was proposed. Propagation of elastic wave in it and its local field resonant modes were investigated numerically with the transfer matrix method. It was shown that for the phononic crystal with lower order sequence,at the central frequency of the phononic band gap,a local field resonant mode appears; then,two local field resonant modes appear symmetrically at the left side and the right one of the central resonant mode; but for symmetrical quasi-periodic phononic crystal with higher order sequence,only there is a local field resonant mode at the central frequency; moreover,for an elastic wave oblique incident,the band gap and resonant modes slowly shift to higher frequency range; the resonant modes in the band gap can act as a super narrow bandwidth filter with multiple channels;for an elastic wave with larger incident angle,the lower frequency elastic wave can propagate through the higher order quasi-periodic phononic crystal.

关 键 词：准周期 FIBONACCI序列 声子晶体 弹性波 

分 类 号：O422.3[理学—声学]