摘要
针对现有通孔型声学超材料存在的低频隔声带宽较窄问题,通过分析通孔声学超材料的声阻抗建立超材料隔声量的理论计算模型,并通过该模型分析在不改变超材料通孔率和隔声峰值频率的条件下如何通过优化薄膜的面密度和张力以增加通孔型声学超材料的隔声带宽。通过一个数值分析案例进一步阐述如何利用理论计算模型进行通孔声学超材料隔声量参数优化并通过有限元仿真结果进行验证。结果表明通过减少薄膜面密度与薄膜张力的比率可以确保在不改变隔声峰值频率情况下有效增加声学超材料的10 dB隔声带宽。
This study provides a theoretical analysis of sound insulation of a perforated acoustic metamaterial based on the sound impedance analysis of the material.The model is then utilized for a parameter optimization design of the metamaterial to enlarge the sound insulation bandwidth with the perforation rate of the material and the peak sound insulation frequency fixed.It is shown that reducing the ratio of the surface density to the pre-tension force of the membrane can lead to an increase of the 10 dB sound insulation bandwidth of the metamaterial with the peak sound insulation frequency fixed.The result is verified by finite element analysis.
作者
刘忠远
林天然
官源林
于承宣
LIU Zhongyuan;LIN Tianran;GUAN Yuanlin;YU Chengxuan(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,Shandong China)
出处
《噪声与振动控制》
CSCD
2020年第1期208-211,244,共5页
Noise and Vibration Control
基金
山东省政府通过山东省‘泰山学者’人才引进项目对本研究课题提供的财政支持
关键词
声学
声学超材料
薄膜
通孔
隔声
带宽优化
acoustics
acoustic metamaterial
membrane
perforation
sound insulation
bandwidth optimization
