蜂窝层芯夹层板结构振动与传声特性研究

蜂窝层芯夹层板应用于飞行器、高速列车等交通工具的主体及底板结构时需要考虑其振动及隔声特性. 针对声压激励下的四边简支蜂窝层芯夹层板结构,应用基于Reissner夹层板理论的结构振动方程建立了的声振耦合理论模型(声压以简支模态双级数的形式引入振动控制方程),结合流固耦合条件求解了声振耦合系统控制方程,应用有限元模拟对理论预测进行了验证. 基于理论模型的数值计算结果,系统研究了蜂窝层芯夹层板结构的振动特性和传声特性,刻画了层芯厚度、蜂窝壁厚、夹层板面内尺寸和声压入射角度等关键系统参数对夹层板振动和传声特性的影响,为此类结构的工程优化设计提供了必要的理论参考.

VIBROACOUSTIC PERFORMANCE OF SIMPLY SUPPORTED HONEYCOMB SANDWICH PANELS

Honeycomb sandwiches used as hulls and floor panels of high-speed train and other transportation vehicles require not only excellent mechanical stiffness/strength but also good sound insulation performance. The vibroacoustic performance of a finite rectangular honeycomb sandwich panel with simply supported boundary conditions is investigated analytically. The vibration governing equation of the structure is established by applying an equivalent method for the honeycomb core and Reissner's theory for sandwich panels. With sound pressure introduced into the vibroacoustic governing equation in the form of double Fourier series, the resultant equations are solved numerically in conjunction with fluid-structure coupling condition. Numerical simulation results with the method of finite elements are employed to validate the analytical model, with excellent good agreement achieved. The developed model is used to investigate the influence of several key system parameters on sound transmission of the structure, including the core thickness, honeycomb wall thickness, in-plane panel dimensions and sound incidence angles. The model presented here holds great practical potential for the optimization design of honeycomb sandwich structures.