一维固液介质准周期结构声子晶体的传输特性  

Propagation of elastic wave in one-dimensional solid and liquid quasi-periodical phononic crystal

作　　者：席锋[1] 刘启能[1] 

机构地区：[1]重庆工商大学计算机科学与信息工程学院,重庆400067

出　　处：《应用力学学报》2013年第5期792-796,810,共5页Chinese Journal of Applied Mechanics

基　　金：重庆市教委科技基金(KJ100717)

摘　　要：针对一维固液介质的Fibonacci序列准周期声子晶体,利用传输矩阵法研究了弹性纵波在准周期结构中的透射特性。计算结果表明:准周期结构具有比周期结构更宽的禁带,并伴随带边谐振;序列越高,带边谐振越强,并在较低序列的禁带中心出现谐振模;弹性波以0.1rad斜入射时,透射谱向高频方向移动;当固液介质波阻抗接近时,出现等间距的谐振模,同时禁带消失。The structure of one-dimensional(1D) quasi-periodic phononic crystal(PnC) composed of solid and liquid is proposed.With transfer matrix method,the transmission of elastic wave propagation through 1D PnC is numerically calculated.The results show that the band gap of the quasi-periodic structure is wider than that of the periodical,and the resonant mode exists in the center of band gap of the lower quasi-periodical sequence.For elastic wave with 0.1rad oblique incidence,the transmission spectra shift toward the higher frequency range.If the wave impedances of the solid and the liquid medium approximate each other,the forbidden band disappears and the equal frequency interval resonant modes appear.

关 键 词：准周期 声子晶体 弹性波 禁带 

分 类 号：O422.3[理学—声学]