弹性波在对称准周期结构固/液声子晶体中的传播

肖绪洋;陈润平;夏继宏;席 锋

振动与冲击 ›› 2014, Vol. 33 ›› Issue (15) : 114-118.

PDF(1592 KB)
PDF(1592 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (15) : 114-118.
论文

弹性波在对称准周期结构固/液声子晶体中的传播

  • 肖绪洋1 ,陈润平1,夏继宏1,席 锋2
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Propagation of elastic wave in symmetrical quasi-periodic phononic crystal composed of solid/liquid

  • Xiao Xuyang1,Chen Runping1,Xia Jihong1,Xi Feng2
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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。

Abstract

On basis of quasi-periodic Fibonacci sequence, the symmetrical quasi-periodic phononic crystal, composed of solid and liquid medium, is proposed. The propagation of elastic wave and the located resonant modes are investigated numerically with transfer matrix method. At the center of phononic band gap, a located resonant mode exists. Then two located resonant modes is exist and they are centered exactly on center resonant mode. But for symmetrical quasi-periodic phononic crystal with high order, there only is one resonant mode in band gap. Moreover, for elastic wave oblique incident, the band gap and resonant modes slowly shift to high frequency region. The resonant modes in band gap can be acted as super narrow bandwidth filter with multiple channels. For elastic wave with large incident angle, the low frequency elastic wave can only propagate through the high order quasi-periodic structure.

关键词

准周期 / Fibonacci序列 / 声子晶体 / 弹性波

Key words

quasi-periodic / Fibonacci sequence / phononic crystal / elastic wave

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导出引用
肖绪洋;陈润平;夏继宏;席 锋. 弹性波在对称准周期结构固/液声子晶体中的传播[J]. 振动与冲击, 2014, 33(15): 114-118
Xiao Xuyang;Chen Runping;Xia Jihong;Xi Feng. Propagation of elastic wave in symmetrical quasi-periodic phononic crystal composed of solid/liquid[J]. Journal of Vibration and Shock, 2014, 33(15): 114-118

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