新型多重谐振结构声子晶体隔声特性

提出了一种新型多重谐振结构声子晶体，该声子晶体结构属于局域共振结构，在300~2 500 Hz频率内有2个较宽的完全带隙和1个方向带隙。在带隙频率范围内对应有隔声峰，改变内、外层散射体材料能在不同频率范围内获得隔声峰。为拓宽隔声峰的频率范围，通过将不同散射体材料组成不同单元结构复合，在不同频率范围内发挥出较好的隔声效果。通过有限元法分析了影响结构复合隔声效果的关键因素。研究表明，采用结构复合能有效改善隔声效果，复合方式以结构间设置一层空气作为缓冲介质为最佳。

Study on the Sound Isolation Characteristics of Novel Phononic Crystal With Muti resonant Structure

In this paper, a phononic crystal with novel multi resonant structure is proposed, which belongs to the locally resonant structure and has two wide absolute band gaps and one directional band gap at the frequency range of 300~2 500 Hz.Within the band gaps frequency range there should be the sound isolation peak and the sound isolation peak at different frequencies can be obtained by changing the scattering material of the inner and outer layers.In order to broaden the frequency range of the sound isolation peak, a better sound isolation effect was achieved in different frequency ranges by combining different unit structures of different scattering materials. The key factors affecting the sound insulation effect of the structure are analyzed by finite element method. The study shows that the sound isolation effect can be effectively improved by using structure compound,and it is best to set up a layer of air as the buffer medium.