多自由度波导抑振器平面阵列的吸声性能研究  

Study on Absorption Characteristic for Combined DOF Waveguide Suppressor Array

作　　者：顾晓军[1] 刘利军[1] 殷学文[1] 朱蓓丽[1] 

机构地区：[1]上海交通大学振动冲击噪声国家重点实验室,上海200240

出　　处：《噪声与振动控制》2008年第1期29-32,共4页Noise and Vibration Control

基　　金：高等学校博士学科点科研基金特别资助项目(20040248011)

摘　　要：多自由度波导抑振器具有吸收低频入射声波的功能。研究了由波导抑振器阵列等效成的单极子-偶极子共振器复合阵列的声学散射问题,研究表明当共振器具有特定的阻尼值时,该多自由度波导抑振器阵列可以成为一个有效的声吸收器。根据布列霍夫斯基赫分层介质中波的相关理论,把波导抑振器阵列层等效成某个特性阻抗的均匀介质层,并数值分析了波导抑振器敷设在水下结构物表面后的吸声性能,得到了吸声性能和共振器阻尼系数,抑振器分布周期的关系。The multiple degrees of freedom （ MDOF ） waveguide vibration suppressor has the capacity to absorb low frequency sound. This paper studied the sound scattering problem of an equivalent array of monopole -dipole resonators for a MDOF waveguide suppressor array. All the result indicates that this array will be an efficient absorber at a certain friction in the resonators. We regard the array of waveguide suppressor as an equivalent layer with certain characteristic impedance from Brekhovskikh＇s wave theory in layered medium and analyzed the sound absorption characteristic of those array attached to marine structure＇s surface. The numerical simulation result indicates the quantitative relationship for sound absorption coefficient versus the friction coefficient and the installation period of suppressor array.

关 键 词：声学 波导抑振器 单极子共振器 偶极子共振器 吸声系数 

分 类 号：O325[理学—一般力学与力学基础] TB532[理学—力学]