摘要
传统的声电类比法对双层微穿孔板吸声结构进行计算时,忽略了空腔声质量的影响,对于空腔距离比较短,频率比较低时是适用的,但是当空腔距离比较大或频率比较高时,则存在误差。用传递矩阵法对微穿孔板吸声结构进行分析:解决了空腔声阻抗的近似计算带来的误差;对于微孔部分传递矩阵中的声阻抗计算仍然采用马大猷教授的理论,不需要引入修正参数δx。通过上述工作,进行了微穿孔板吸声结构的吸声系数的计算和相应的实验验证,理论计算结果与实验数据吻合良好。
Equivalent electro-acoustic circuit approach is adopted to estimate the absorption coefficient of double layer micro-perforated structure. However, this method ignores the effect of acoustic mass, and is only applicable to the structure with short cavity and at low frequency. For the structure with long cavity or at high frequency, the calculation error will be manifested. In order to solve this problem, the transfer matrix method is adopted to analysis of micro-perforated panel absorber＇s acoustic structure. This method avoids the error of the cavity acoustic impedance＇s approximate calculation. The calculation of micro-perforated part＇s acoustic impedance can still be made by using MA＇s theory, without amendment of parameter δx. After the theoretical analysis, both calculation and experiments are carried out to prove the correctness of the study.
出处
《声学技术》
CSCD
2009年第2期164-167,共4页
Technical Acoustics
关键词
声学
微穿孔板
传递矩阵
acoustics
micro-perforated panel
transfer matrix method
