平面波激励下双层圆柱壳隔声性能分析  

Analysis of Sound Insulation Performance of Double-walled Cylindrical Shells under Plane Wave Excitation

作　　者：张群林 杨国强 阙开放 庞辉[1] 赵桐[1] 崔亚辉[1] ZHANG Qunlin;YANG Guoqiang;QUE Kaifang;PANG Hui;ZHAO Tong;CUI Yahui(School of Mechanical and Precision Instrument Engineering,Xi′an University of Technology,Xi′an 710048,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,西安710048

出　　处：《噪声与振动控制》2024年第6期41-48,共8页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(12202351)。

摘　　要：结合Donnell薄壳体理论以及声振耦合边界条件,采用模态展开方法建立平均流作用下无限长双层圆柱壳传声损失理论模型,分析算法的收敛性,并通过与已有文献中的结果比较验证模型的精度。进一步分析平面波俯仰角和方位角、壳间间隙、平均流等参数对壳体传声损失的影响,结果表明:俯仰角和方位角的变化会影响系统的声振耦合特性,低频段传声损失峰谷值位置改变明显;壳间间隙的增加有利于提升中高频段传声损失,同时低频段传声损失降低;平均流马赫数越大,壳体中高频传声损失越高。研究结果可为双层圆柱壳隔声性能调控提供参考。Combining Donnell's thin shell theory and acoustic-structure coupling boundary conditions,a theoretical model of transmission loss through an infinitely long double-walled cylindrical shell was developed in the presence of mean flow by using the modal expansion method.The convergence of the algorithm was analyzed,and the accuracy of the model was verified in comparison with the results in the existing literature.The effects of the incident and azimuthal angles of the plane wave,the inter-shell gap and the mean flow on the shell transmission loss were further investigated The results show that:changes of the incident and azimuthal angles will affect the acoustic-structure coupling characteristics of the system,and the locations of peaks and dips of sound transmission losses are altered evidently in the lower frequency band;the enlargement in the inter-shell gap results in an increase of transmission loss in the middle and high frequency bands,but a decrease of transmission loss in the low frequency band;a larger mean flow Mach number means higher total sound transmission loss in the mid and high frequency bands.Results of this study may provide a reference for sound insulation performance regulation of double-layer cylindrical shells.

关 键 词：声学 双层圆柱壳 隔声 平面波 传声损失 

分 类 号：TB53[理学—物理]