二维磁流变包层声学超材料

Two-dimensional magnetorheological cladding acoustic metamaterials

该文构建了以钨为内核、环氧树脂为基体、磁流变弹性体作为包层的二维局域共振型声学超材料,采用有限元方法分析了声波的能带结构、透射率、振动模。研究结果表明:利用外磁场可以调控磁流变弹性体包层的弹性模量,从而调节声学超材料带隙的中心位置和宽度,还可以通过改变磁流变弹性体包层的厚度来调节带隙的中心位置和宽度。这些方法对可调型声学超材料的设计有重要的参考意义。

A two-dimensional local resonance acoustical metamaterial with tungsten as the core,epoxy resin as the matrix,and magnetorheological elastomer as the cladding is constructed in this paper.And the phononic band structure,transmittance,and vibration mode of the acoustic wave using the finite element method were analyzed.The results of the study indicate that the external magnetic field can regulate the elastic modulus of the magnetorheological elastomer coating,thereby adjusting the central position and width of the band gap of the acoustic metamaterial.The central position and width of the band gap can also be adjusted by changing the thickness of the magnetorheological elastomer coating.These methods have important reference significance for the design of adjustable acoustic metamaterials.