摘要
在燃烧室的空间和质量有限的情况下,为达到更好的声抑制效果,该文提出了将单层微穿孔板一分为二,采用与单层结构具有相同穿孔率、穿孔半径、质量及占用空间的双层串联微穿孔板结构。通过声-电类比法推导了温度变化条件下双层串联微穿孔板结构吸声系数的计算公式,并与单层结构的吸声特性进行了对比仿真分析,最后得出将单层结构一分为二,采用双层串联结构具有更宽的吸声频带,在高温条件下,其吸声效果更好。
In order to obtain better acoustic restraining effect when the space and the weight was limited in firebox, the paper brought forward double layer micro-perforated panel absorber＇s instead of single micro-perforated ab- sorbers, but the double one and the single one have the same perforated percentage, the same perforation radius, the same weight and the same space. Formulation of sound absorption coefficient of double layer micro-perforated panel absorber＇s was deducted with electro-acoustic analogy approach. The numerical simulation and contrast analy- sis of sound absorption characteristic of single micro-perforated panel absorber＇s was done. Finally, the paper brought forward double layer micro-perforated panel absorber＇s has wider sound absorption band and better sound absorption effect than single one, especially in high temperature, the double one could reduce noise in wide-band range.
出处
《压电与声光》
CSCD
北大核心
2009年第1期139-141,共3页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(10574105)
全国百篇优秀博士学位论文基金资助项目(200451)
关键词
燃烧室
双层串联结构
温度变化
吸声特性
firebox
double layer structure
temperature altering
absorption characteristic
