基于磁流变薄膜的可调谐主动声学超材料  

A tunable active acoustic metamaterial based on magnetorheological thin membrane

作　　者：闻轶凡 吴卫国[1] 杭锐 WEN Yi-fan;WU Wei-guo;HANG Rui(School of Civil and Mechanics Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)

机构地区：[1]江苏大学土木工程与力学学院

出　　处：《声学技术》2019年第3期248-252,共5页Technical Acoustics

摘　　要：为了实现声学超材料等效参数的非接触式主动控制,基于磁流变薄膜设计了一种磁固耦合的主动声学超材料,该结构由铝质环形框架和附加质量块的磁流变薄膜组成。运用COMSOL软件对其声学特性和隔声性能进行了详细分析,结果表明:改变外加磁场强度能够调节所设计的声学超材料的固有频率,与被动声学超材料相比,实现了非接触主动控制声学超材料系统的隔声峰值频率,从而拓宽了声学超材料的隔声频率范围;在此基础上进一步研究了磁流变薄膜材料参数、薄膜预应力和附加质量对隔声性能的影响。A tunable active acoustic metamaterial based on magnetorheological thin membrane is designed for contactless active control of sound wave in low frequency range. The metamaterial is made up of an aluminum frame and a magnetorheological thin membrane attached to a mass block. By numerical calculation and analysis, it is concluded that the magnetic field can adjust the resonant frequency of the metamaterial in a certain range. So, this tunable metamaterial can get better sound insulation effect than the traditional passive metamaterial in a wide range of low frequencies. In addition, the effects of the parameter of magnetorheological material, the membrane pretress and the additional mass on the sound insulation are studied.

关 键 词：主动声学超材料 磁流变薄膜 隔声性能 低频 

分 类 号：O422.8[理学—声学]