空腔声质量对双层微穿孔板计算影响的研究  

Influence of Cavity Sound Mass on Double Layer Micro-Perforated Panel Calculation

作　　者：赵晓丹[1] 赵燕燕[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《噪声与振动控制》2008年第5期157-159,167,共4页Noise and Vibration Control

摘　　要：微穿孔板吸声结构的声阻抗由微孔的声阻抗和空腔的声阻抗两部分组成,而空腔的声阻抗涉及双曲余切函数的计算。对该函数采用近似计算只适用于空腔距离比较短,频率比较低的情况。通过对双曲余切函数进行泰勒展开,研究空腔的声质量和声顺,获得双层微穿孔板吸声结构的等效电路图。其中第一空腔的声质量与微孔的声质量是串联的。由此进行双层微穿孔板的计算,提高计算精度,并通过实验进行验证。The acoustic impedance of micro-perforated plate absorbers consists of the acoustic impedances of the micro-perforated plate and the cavity. The acoustic impedance of the cavity depends on the calculation of hyperbolic cotangent function. However, the approximate calculation of hyperbolic cotangent can only be applied to the cavity with short distance and low frequency. In this paper, based on the Taylor expansion of the hyperbolic cotangent, acoustic mass and acoustic compliance of the cavity were analyzed. After that, the equivalent electrical circuit of micro-perforated plate absorber was designed, where the connection of the acoustic mass of micro-perforated plate with the acoustic mass of the first layer cavity was series. Calculation of double-layer micro-perforated plate was carried out. And the results were verified by experiments.

关 键 词：声学 微穿孔板 声质量 声顺 

分 类 号：TU112.5[建筑科学—建筑理论]