非等厚空腔微穿孔吸声结构的声学特性研究  

Acoustic Characteristics of Micro-perforated Panel Acoustic Absorbers with Variable Cavity Depth

作　　者：刘秀娟[1] 蒋伟康[2] 

机构地区：[1]宁夏大学机械工程学院,银川750021 [2]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《机械科学与技术》2010年第6期755-758,共4页Mechanical Science and Technology for Aerospace Engineering

基　　金：上海市重大科技攻关项目(03DZ12021);宁夏大学科研基金项目(QN200709);宁夏高等学校科学研究项目(2007)资助

摘　　要：对非等厚空腔微穿孔吸声结构提出一种垂直入射吸声系数的计算方法。该方法根据微穿孔板吸声体理论求得微穿孔板的声阻抗率;借助声场分析软件求得非等厚空腔的输入声阻抗率;由声电类比原理求得吸声体的吸声系数。3种三棱柱吸声体和一种圆锥吸声体的计算和实验测试表明,该方法的预测结果与驻波管测试结果吻合较好。该方法可用以代替实验对非等厚空腔微穿孔吸声体进行吸声性能的预测,简化了设计工作。A method for calculating the normal incidence acoustic absorption coefficient is presented for the microperforated panel absorbers with variable cavity depth.In this method,the characteristic impedance of microperforated panel is calculated on the basis of the theory of micro-perforated panel absorbers,and the input acoustic impedance of heterogeneous cavity is calculated by ANSYS.The absorption coefficient of absorber is determined from the analogism between acoustics and electricity.The acoustic absorption coefficients of three kinds of triangular prism absorbers and one kind of cone absorber are calculated and measured by stationary wave tube.It can be seen that the calculated results are in good agreement with the experimental results.It proves that the method can be applied to predicting the absorption performance of the micro-perforated panel absorbers with variable cavity depth,and the design procedure is simplified.

关 键 词：非等厚空腔 微穿孔吸声结构 吸声系数 

分 类 号：TB535[理学—物理]