摆臂式薄膜型声学超材料隔声性能  

The sound insulation performance of membrane-type acoustic metamaterials with pendulum arm

作　　者：王可[1] 熊潞锦 伍守豪[2] WANG Ke;XIONG Lujin;WU Shouhao(Shenzhen University,Shenzhen 518060,China;Research Institute of Tsinghua University in Shenzhen,Shenzhen 518071,China)

机构地区：[1]深圳大学,深圳518060 [2]深圳清华大学研究院,深圳518071

出　　处：《应用声学》2025年第2期299-311,共13页Journal of Applied Acoustics

基　　金：深圳市科技计划项目(JSGG20200103094001790,CJGJZD20200617102802007);深圳市重点项目(KCXFZ20201221173413038);深圳市基础研究项目(JCYJ20220809170611004)。

摘　　要：薄膜型声学超材料因其构造轻巧且具有良好的隔声效果而备受关注。受十字型摆臂式薄膜型声学超材料结构启发,该文通过改变摆臂结构和质量块分布,提出了4种不同的摆臂式结构:十字型摆臂末端外加四质量块、十字型摆臂式外加八质量块、米字型摆臂式外加四质量块以及米字型摆臂式外加八质量块。为比较不同结构的隔声性能,分析了薄膜声学超材料低频隔声机理,结合传声损失的计算公式,对不同结构进行了传声损失仿真分析。通过仿真模型得到的传声损失曲线发现,米字型摆臂外加八质量块的隔声性能在4种新模型中最佳。该文对比不同结构的模态图进行模态分析,分析了5种结构的多态反共振模式,得到米字型摆臂外加八质量块的模态最为丰富。通过合理设计结构和材料参数,就能在一定程度上改变反谐振模式,并将隔声量曲线带宽调整到所需的频率范围内。通过隔声实验验证了仿真方法的准确性。Membrane-type acoustic metamaterials have attracted much attention because of their lightweight structure and good sound insulation effect.Inspired by the membrane-type acoustic metamaterial structure of the cross pendulum arm,four different pendulum arm structures are proposed by changing the pendulum arm structure and mass distribution:cross type pendulum arm end plus four mass block,cross type pendulum arm plus eight mass block,star-shaped pendulum arm plus four mass block and star-shaped pendulum arm plus eight mass block.In order to compare the sound insulation performance of different structures,the low-frequency sound insulation mechanism of membrane-type acoustic metamaterials is analyzed,and the sound transmission loss of different structures is simulated according to the calculation formula.Through the sound transmission loss curve obtained by the simulation model,it is found that the sound insulation performance of the star-shaped pendulum arm plus the eight-mass block is the best among the four new models.In this paper,modal analysis is carried out by comparing the modal graphs of different structures,and the multistate anti-resonance modes of five structures are analyzed,and it is found that the modes of the star-shaped pendulum arm plus eight mass block is the most abundant.Through reasonable design of structure and material parameters,the anti-resonance mode can be changed to a certain extent,and the bandwidth of the sound insulation curve can be adjusted to the required frequency range.The accuracy of the simulation method is verified by sound insulation experiments.

关 键 词：薄膜型声学超材料 摆臂式结构 隔声性能 模态分析 

分 类 号：TU112.5[建筑科学—建筑理论]