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Low frequency acoustic properties of bilayer membrane acoustic metamaterial with magnetic oscillator 被引量:4
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作者 Nansha Gao Hong Hou Yihao Mu 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2017年第4期252-257,共6页
A bilayer membrane acoustic metamaterial was proposed to overcome the influence of the mass law on traditional acoustic materials and obtain a lightweight thin-layer structure that can effectively isolate low frequenc... A bilayer membrane acoustic metamaterial was proposed to overcome the influence of the mass law on traditional acoustic materials and obtain a lightweight thin-layer structure that can effectively isolate low frequency noise. The finite element analysis(FEA) results agree well with the experimental results.It is proved that the sound transmission losses(STLs) of the proposed structures are higher than those of same surface density acoustic materials. The introduction of the magnetic mass block is different from the traditional design method, in which only a passive mass block is fixed on the membrane. The magnetic force will cause tension in the membrane, increase membrane prestress, and improve overall structural stiffness. The effects of the geometry size on the STLs are discussed in detail. The kind of method presented in this paper can provide a new means for engineering noise control. 展开更多
关键词 Bilayer membrane acoustic metamaterial low frequency sound insulation Sound transmission loss Magnet oscillator
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