表面张力对薄膜型声学超材料隔声性能的影响

目前许多对于薄膜型声学超材料隔声性能的研究仅限于数值方法,其结构参数可以很方便的调节,但缺乏必要的实验验证。因此,从有限元仿真和实验验证两个角度出发,主要研究了弹性薄膜的表面张力对由它和质量块组合而成的薄膜型声学超材料的隔声性能的影响。采用COMSOL Multiphysics软件对薄膜型声学超材料进行声学仿真研究,通过所得到的传递损失曲线能够更直观和方便地分析声波通过薄膜型声学超材料后对声音衰减的效果,并采用驻波管法对薄膜型声学超材料的隔声性能进行实验验证。结果表明,随着薄膜表面张力的增大,其传递损失峰值所对应频率向高频移动,且吸声系数峰值增多,所对应的频率范围增大。

Effect of surface tension on acoustic insulation performance of membrane-type acoustic metamaterials

At present, many researchers on the sound insulation performance of membrane-type acoustic metamaterials are limited to numerical method, and its structural parameters can be adjusted conveniently, but lack necessary experimental verification. Therefore, in this paper, the influence of surface tension on the acoustical properties of elastic membrane, composed of elastic membrane and mass blocks, was mainly studied. The finite element simulation and experimental verification of membrane-type acoustic metamaterials are studied. COMSOL Multiphysics software was used to conduct acoustic simulation research on membrane-type acoustic metamaterials, and the transmission loss curve obtained could more directly and conveniently analyze the sound attenuation effect of sound waves after passing membrane-type acoustic metamaterials. The sound insulation performance of membrane-type acoustic metamaterials was experimentally verified by standing wave tube method. The results show that with the increase of the tension of the membrane, the peak of transmission loss moved towards high frequency, and the peak of sound absorption coefficient and the corresponding range of sound attenuation frequency increased.