充液圆柱壳受迫振动的能量流输入及传播

Input vibrational power flow and its transmission in a fluid-filled shell

以一无限长弹性充液圆柱壳的受迫振动能量流为研究对象，分别用Ｆｌｕｇｇｅ方程和Ｈｅｌｍｈｏｌｔｚ方程分析了壳体及声场的波运动，利用圆柱亮－流体的耦合条件，获得系统的振动特性方程．分析了此系统在周向线分布余弦简谐外载作用下的响应；用傅里叶变换和反交换得到能量流的输入，以及当受迫振动波沿着壳体轴向传播时，壳体各内力和壳内流体所携带能量流的变化规律．

The characteristics of vibrational power flow in an infinite elastic cylindrical shell filled withfluid are investigated. The simple harmonic motion of shell and the Pressure field in the contained fluidare described by the FIugge shell equations and the Helmholtz equation respectively. The vibrationalequation of this system is obtained by using the coupling of shell and fluid. By using the Fouriertransform and its inverse transform, the input power into this coupled system under a simple harmonic,linearly distributed driving force is studied. Along the shell, the transmission of the power flow carriedby different shell internal forces and by the contained fluid are discussed.