An analysis of forced coupled vibration of fluid-filled elastic cylindrical shell

This paper presents an analytical study on the fluid-structure coupled vibration of an infinite fluid-filled elastic cylindrical shell. The forced vibration excited by an internal acoustic source are derived based on Kennard shell equations, the input mobility, wave propagation and energy distribution between structure and fluid are analyzed numerically. The results show the wave propagation pattern and energy distribution in the system mostly depend on the excitation input type and location of the system. When the excitation input is the monopole acoustic source in the fluid, the energy is mostly carried and propagated by the fluid in most frequencies, only at those frequencies where the coupling between the structure and fluid is strong, the energy is transferred to the structure. And the closer to the shell the excitation source is, the bigger the proportion of transferred energy is.