流管声传播与膜结构相互作用的机理研究

ON THE MECHANISM OF THE INTERACTION BETWEEN FLEXIBLE PANELS AND SOUND WAVES IN FLOW DUCTS

以等价分布源方法为基础研究流管声传播与膜结构相互作用的机理．根据广义格林函数给出任意截面管道的通用模型．并在此基础上研究了结构参数、流动马赫数、高阶模态波对膜结构消声器降噪量及临界频率的影响．此外,还讨论了流体介质对声波与膜片相互作用的影响,可以看出膜结构消声器在水下也能得到广泛的应用．

The control of sound propagation in ducts has always been a problem of concern. One of new attempts is to make use of the interaction between a soulid wave and a flexible panel to reduce the sound propagation. This paper presents a general model to describe the interaction between flexible panels and sound waves with the emphasis on the effect of flow Mach number, higher order modes and annular or circular geometrical parameters on the control of sound propagation, which is not much studied in the current literature. Based on a comparison with the existing results, some important parametric study is made in the present paper. Further research work is suggested after a detailed discussion and analysis on the numerical results.