分层多孔材料吸声结构的性能分析

刘新金;刘建立;徐伯俊;高卫东

振动与冲击 ›› 2012, Vol. 31 ›› Issue (5) : 106-110,.

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PDF(1287 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (5) : 106-110,.
论文

分层多孔材料吸声结构的性能分析

  • 刘新金; 刘建立; 徐伯俊; 高卫东
作者信息 +

Acoustic analysis of multi-layered porous material sound absorbing structure

  • LIU Xin-jin, LIU Jian-li, XU Bo-jun, GAO Wei-dong
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摘要

利用声波在分层介质中的传播方程,给出了由不同种吸声材料复合而成的多层吸声结构吸声系数的递推计算公式。继而以由多孔吸声材料复合而成的双层吸声结构为基础,通过数值仿真,深入分析了内外层材料的厚度、孔隙率、和微孔半径变化对吸声系数的影响。以导出的递推计算公式为基础,通过仿真实验研究了分层吸声结构的参数优化设计。结果表明:由多孔材料复合而成的分层吸声结构具有良好的吸声效果,通过合理配置各层材料结构参数,可以在较宽的频段上达到较为满意的吸声效果,从而为相应产品的开发提供了理论依据

Abstract

using the transmission equation of acoustic in the layered media, the recursive formula of absorption coefficient of multi-layered structure is given. Then, for the double layer structure made of porous sound-absorbing material, the effect of acoustic parameters including the thickness, porosity and pore radius of each layer on the absorption coefficient is analyzed by numerical calculation. Based on the recursive formula, parameter optimization of the multi-layered sound absorbing structure is investigated. It shows that the multi-layered sound absorbing structure made of porous sound-absorbing material has good sound absorption and can afford sufficiently satisfying sound absorption level in a cared frequency range. The results provide a theoretical support for product design.

关键词

多孔吸声材料 / 吸声系数 / 分层吸声结构

Key words

porous sound-absorbing material / absorption coefficient / multi-layered sound absorbing structure

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刘新金;刘建立;徐伯俊;高卫东. 分层多孔材料吸声结构的性能分析[J]. 振动与冲击, 2012, 31(5): 106-110,
LIU Xin-jin;LIU Jian-li;XU Bo-jun;GAO Wei-dong. Acoustic analysis of multi-layered porous material sound absorbing structure [J]. Journal of Vibration and Shock, 2012, 31(5): 106-110,

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