温度变化条件下微穿孔板声学特性研究  

Acoustic Characteristic of Microperforated Panel in Altering Temperature

作　　者：王鹏[1] 王敏庆[1] 樊晓波[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《振动．测试与诊断》2007年第4期267-269,共3页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(编号:10574105);全国优秀博士学位论文基金资助项目(编号:200451)

摘　　要：根据微穿孔板吸声理论,采用理论分析和仿真的方法,着重讨论微穿孔板在温度梯度下的声阻抗、共振频率和吸声系数等声学特性,分析其受温度影响变化的机理,得到微穿孔板吸声效果受温度变化影响的规律及其仿真结果。分析表明:温度升高时,相对声阻将变大,相对声质量变小,共振频率变大,频带宽度增宽,吸声系数在某一温度处有一最大值1,偏离该温度吸声系数均递减。Based on the acoustic absorption theory of microperforated panel and by the means of the theoretical analysis and emulation,the paper focuses on the acoustic characteristic including acoustic impedance,frequency and acoustic absorption coefficient of microperrforated panel working in the combustion chamber which has high temperature and great temperature gradient.Changing laws affected by temperature changing are analyzed,and the changing laws of the effect on sound absorption due to the temperature changing and their emulation results are obtained.The analysis indicates that when the temperature rises,the relative acoustic resistance increases,the relative acoustic mass diminishes,the resonance frequency increases,the bandwidth broadens,and the absorption coefficient can get a maximum 1 in some temperature,and it decreases if the temperature falls away.

关 键 词：燃烧室 微穿孔板 温度变化 频率特性 声吸收系数 

分 类 号：TB132[理学—物理]