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设计了一种由铝和塑料组成的ABBA结构的一维异质双周期镜像声子晶体.用传递矩阵法研究了温度参量的变化对该声子晶体的声波带隙的影响.当温度发生变化时,声子晶体除了发生线膨胀之外,组成声子晶体材料的铝和塑料的杨氏模量也会发生变化,这就导致了声波在介质内的传播速度发生变化.通过观察分析透射谱线,发现在温度变量的影响下,声波带隙能够可控的出现和消失,随着温度的升高,声波带隙会向频率减小的方向移动.特别是在一定温度条件下出现带隙的反转,由带隙变为通带.结果表明,温度对声子晶体带隙有着明显的影响.这个特性可为新型声学器件的设计提供理论参考.
A one-dimensional heterogeneous two-period mirror phononic crystal with ABBA structure composed of aluminum and plastic was designed. The influence of the change of temperature parameter on the acoustic band gap of the phononic crystal was investigated by transfer matrix method. When the temperature changes In addition to the linear expansion of the phononic crystal, the Young’s modulus of the aluminum and plastic composing the phononic crystal material also changes, which leads to the change of the propagation speed of the acoustic wave in the medium. By observing and analyzing the transmission spectrum Line and found that under the influence of the temperature variable, the band gap of the acoustic wave can appear and disappear with the controllable. As the temperature increases, the band gap of the acoustic wave will move toward the direction of decreasing frequency, especially the band gap appears under a certain temperature The results show that the temperature has a significant effect on the band gap of phononic crystals.This property can provide a theoretical reference for the design of new acoustic devices.