VIBRATIONAL POWER FLOW INPUT AND TRANSMISSION IN A CIRCULAR CYLINDRICAL SHELL FILLED WITH FLUID

In this paper, the characteristics of vibrational power flow in an infinite elastic circular cylindrical shell filled with fluid are investigated. The Flügge thin shell theory and Helmholtz equation are employed respectively in analyzing the wave motion in the shell wall and the sound field in the fluid. The coupling condition on the inner surface of the shell wall is introduced to obtain the vibrational equation of this coupled system. By using Fourier transform and its inverse transform, the input power into the coupled system excited by a driving force is studied. Along the shell axial direction, the transmission of the power flow carried by different internal forces of the shell wall and by the fluid is also studied. The results show that the input power flow and the power flow transmission depend mainly upon the characteristics of the free propagating waves in this coupled system.