Abstract: The axial vibration of liquid-filled pipe is analyzed on the base of beam model considering Possion coupling and junction coupling. Wave propagation equation and nodal scattering model of the fluid-structure interaction(FSI) system are formulated. Based on the scattering model, a new approach of the traveling wave method is presented to study the coupling vibration of pipes. The wave-guide equation of the liquid-filled pipe is deduced by adopting the axial displacement as basic variable. The dynamic model of the FSI system is assembled according to the nodal scattering equation. Based on the above works, the effects of Possion coupling and junction coupling are investigated accounting for several different boundary conditions. Numeric simulation indicates that the traveling wave method is very convenient to model structures and it gives high numerical precision. So this method can be applied to complicate pipe modeling and controlling.

Key words: fluid-structure interaction, axial vibration, traveling wave method