【摘要】 提出了一维准周期结构的声子晶体模型.对弹性波通过该一维准周期结构声子晶体的透射系数进行了数值计算,并与周期结构的透射系数进行了比较.计算结果表明,弹性波通过一维准周期结构声子晶体时,同样会有带隙的出现,且带隙所在频率范围与周期结构的情形完全一样,不同的是在准周期结构声子晶体中,带隙内有很强的局域共振模.对此局域模性质的研究有助于声波或弹性波滤波器的制作.更多还原

【Abstract】 In this paper, the model of a one-dimensional (1D) phononic crystal with quasi-periodical structure is proposed. The transmission coefficients of elastic waves through the 1D qusi-periodical phononic crystal are numerically calculated, and the obtained transmission coefficients are compared with those of the phononic crystal with periodical structure. The results show that the band gap can also be found in the phononic crystal with quasi-periodical structure, and the frequency range of the gap is the same as that of the periodical structure. However, the only difference is that strongly localized resonant modes appear in the gap of the qusi-periodical phononic crystal. This study to the properties of the localized modes is useful to the fabrication of the acoustic or elastic wave filters.更多还原