文章摘要
周榕,吴卫国,闻轶凡.一种带薄膜结构的Helmholtz腔声学超材料[J].声学技术,2017,36(4):297~302
一种带薄膜结构的Helmholtz腔声学超材料
An acoustic metamaterial based on Helmholtz resonator with thin membrane
投稿时间:2016-09-08  修订日期:2016-11-12
DOI:10.16300/j.cnki.1000-3630.2017.04.001
中文关键词: Helmholtz 腔  声学超材料  透射系数
英文关键词: Helmholtz resonator  acoustic metamaterial  transmission coefficient
基金项目:
作者单位E-mail
周榕 江苏大学土木工程与力学学院, 江苏镇江 212013  
吴卫国 江苏大学土木工程与力学学院, 江苏镇江 212013 wuwg@ujs.edu.cn 
闻轶凡 江苏大学土木工程与力学学院, 江苏镇江 212013  
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中文摘要:
      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。
英文摘要:
      An acoustic metamaterial based on Helmholtz resonator with inner thin membrane is designed for controlling sound wave in low frequency range. By numerical calculation and analysis, it is concluded that an original Helmholtz resonator without thin membrane needs bigger geometric sizes to get better transmission coefficient curve in low frequency range, and its frequency band is very narrow. The transmission coefficient curve of the new designed acoustic metamaterial can show more minimal values in low frequency range, so that it can get better sound insulation effect in a wider low frequency range with the same geometric sizes as the original Helmholtz resonator. In addition, the geometric sizes of the acoustic metamaterial that affect the transmission coefficient are studied and the optimal geometric sizes of acoustic metamaterial are obtained.
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