一种带薄膜结构的Helmholtz腔声学超材料

发布时间：2018-07-09 09:28

  本文选题：Helmholtz腔 + 声学超材料　； 参考：《声学技术》2017年04期

【摘要】：为有效控制低频宽带噪声,设计了一种带薄膜结构的Helmholtz腔声学超材料。利用COMSOL软件对其透射特性进行详细分析,结果表明:不带膜的原本的Helmholtz腔结构其透射系数虽在低频范围内可以得到峰值,但其结构尺寸较大,且频带很窄,而文中设计的声学超材料结构的透射系数在低频范围可得到多个峰值,在相同结构尺寸下,与原本的Helmholtz腔结构相比,其固有频率向低频范围内偏移,因而提高了结构的低频隔声效果,拓宽了结构的隔声频率带宽。在此基础上进一步研究了声学超材料结构几何参数对透射系数的影响,优化了声学超材料的结构几何参数。
[Abstract]:In order to control the low frequency wideband noise, an acoustic supermaterial with thin film structure for Helmholtz cavity was designed. The transmission characteristics of Helmholtz cavity without film are analyzed in detail by COMSOL software. The results show that the transmission coefficient of the original Helmholtz cavity without film can be obtained in the low frequency range, but its structure size is large and the frequency band is very narrow. The transmission coefficient of the acoustic metamaterials designed in this paper can obtain multiple peaks in the low frequency range. At the same structure size, the natural frequency of the designed acoustic supermaterial structure is shifted to the low frequency range compared with the original Helmholtz cavity structure. Therefore, the low frequency sound insulation effect of the structure is improved, and the bandwidth of the structure sound insulation frequency is widened. On this basis, the influence of structural geometric parameters of acoustic metamaterials on transmission coefficient is further studied, and the structural geometric parameters of acoustic supermaterials are optimized.
【作者单位】： 江苏大学土木工程与力学学院;
【分类号】：TB34
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本文编号：2108918