新型多共振腔声子晶体声屏障的带隙机理及其隔声性能研究  

Bandgap mechanism and sound insulation performance of a novel multi-resonantcavity sonic crystal sound barrier

作　　者：李彬生 戴卓辰 张程 姚凌云[1,2] LI Binsheng;DAI Zhuochen;ZHANG Cheng;YAO Lingyun(College of Engineering and Technology,Southwest University,Chongqing 400715,China;Chongqing Key Laboratory of Agriculture Equipment for Hilly and Mountainous,Chongqing 400715,China)

机构地区：[1]西南大学工程技术学院,重庆400715 [2]丘陵山区农业装备重庆市重点实验室,重庆400715

出　　处：《振动与冲击》2023年第15期182-189,259,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(52175121)。

摘　　要：为控制道路噪声水平,设计了一种新型多共振腔的声子晶体声屏障。该设计先采用理论和仿真计算分析多腔声子晶体的能带结构,研究不同共振腔数量和晶胞形状对声子晶体禁带特性的影响情况,发现随着共振腔个数的增加,带隙的数量和宽度也在增加;针对同种多腔散射体模型还对不同晶格排列方式进行能带特性分析,阐明不同排列方式对带隙范围的影响。为进一步验证带隙的准确性,利用有限元法和边界元法分别仿真计算六共振腔声子晶体声屏障的传递损失,得到的传递损失曲线与其带隙特性能较好的匹配上。最后利用室外试验分别验证其在三角晶格和正方形晶格排列下的隔声效果。试验证明了该新型多共振腔声子晶体声屏障在带隙范围内具有良好的降噪性能。Here,to control road noise level,a novel sonic crystal sound barrier with multi-resonant cavity was designed.In the design,firstly,theoretical and simulation calculations were used to analyze energy band structure of multi-cavity sonic crystal,and study effects of different resonant cavity numbers and unit cell shapes on bandgap characteristics of sonic crystal.It was found that with increase in number of resonant cavities,number and width of bandgap also increase.For the same multi-cavity scatterer model,energy band characteristics of different lattice arrangements were also analyzed to clarify effects of different lattice arrangements on bandgap range.In order to further verify the correctness of bandgap,the finite element method and the boundary element method were used,respectively to calculate insertion loss of a six-resonant cavity sonic crystal sound barrier,and the obtained insertion loss curve matched better with its bandgap characteristics.Finally,outdoor experiments were conducted to verify the sound barrier’s sound insulation effects under arrangements of triangular lattice and square lattice,respectively.Experiments showed that the novel multi-resonant cavity sonic crystal sound barrier has good noise reduction performance within its bandgap range.

关 键 词：局域共振 声子晶体 声屏障 传递损失 

分 类 号：X593[环境科学与工程—环境工程]