基于磁流变薄膜的可调谐主动声学超材料
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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.
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.
引文
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[2]LEE S H,PARK C M,SEO Y M,et al.Composite acoustic medium with simultaneously negative density and modulus[J].Phys.Rev.Lett.,2010,104(5):0543011-0543014..
[3]梅军,马冠聪,杨旻,等.暗声学超材料研究[J].物理,2012,41(7):425-433.MEI Jun,MA Guancong,YANG Min,et al.Dark acoustic metamaterials[J].Physics,2012,41(7):425-433.
[4]YANG Z,DAI H M,CHAN N H,et al.Acoustic metamaterial panels for sound attenuation in the 50-1000 Hz regime[J].Appl.Phys.Lett.,2010,96(4):041906-041906-3.
[5]MEI J,MA G C,YANG M,et al.Dark acoustic metamaterials as super absorbers for low-frequency sound[J].Nat.Com.,2012,3(2):756-762.
[6]AKL W,BAZ A.Analysis and experimental demonstration of an active acoustic metamaterial cell[J].J.Acoust.Soc.Am.,2012,111(4):045051-045059.
[7]PAVEL M,KATERINA S,JAN V,et al.Noise shielding using active acoustic metamaterials with electronically tunable acoustic impedance[J].Inter Noise,2014,10(1):16-25.
[8]XIAO S W,MA G C,LI Y,et al.Active control of membrane-type acoustic metamaterial by electric field[J].Appl.Phys.Lett.,2015,106(3):0919041-0919045.
[9]CHEN Y,HU G,HUANG G.A hybrid elastic metamaterial with negative mass density and tunable bending stiffness[J].Appl.Phys.Lett.,2017,105(5):179-198.
[10]孙书蕾.磁流变体有限变形数值模拟及本构建模研究[D].西安:西北工业大学,2015:32-52.SUN Shulei.Research about numerical modeling and constitutive modeling of magnetorheological elastomers under finite deformation[D].Xi'an:Northwestern Polytechnical University,2015:32-52.
[11]FENG J Q,XUAN S H,LIU T X,et al.The prestress-dependent mechanical response of magnetorheological elastomers[J].SmartMater.Struct.,2015,24(9):0850321-0850329.