多重开孔式声子晶体隔声特性研究

Sound Isolation Characteristics of Phononic Crystal with Multi-opening Structure

设计了一种多重开孔式局域共振声子晶体结构,结合有限元方法计算结构的带隙和隔声特性,并进一步分析了影响隔声效果的因素。结果表明,该结构在41~1500 Hz范围内存在一个较宽的完全带隙和两个较宽的方向带隙。隔声峰出现的位置与带隙频率范围相对应。通过增加内部金芯体的半径,减小包覆层硅橡胶孔的尺寸,可以取得更好的隔声效果。通过在结构中新增一层复合层,可使整体结构的隔声性能进一步优化。

A type of locally resonant phononic crystal with multi-opening structure was proposed.The structure’s band gap and sound transmission loss were investigated with the finite element methods.The factors that affecting the sound isolation effect were also studied.It is found that,the proposed structure has one wide absolute band gap and two wide directional band gaps in the frequency ranging from 41 Hz to 1500 Hz.The location of sound isolation peaks are consistent with the frequency range of band gaps.By increasing the radius of inner golden core and reducing the size of the openings in the middle silastic layer,a better sound isolation effect could be obtained.Furthermore,with a new compound layer adding to the structure,the sound isolation effect of total structure could be further improved.