Abstract: Fluid and structure interaction vibration in pipe system conveying fluid exists in many fields, its vibration control is very important. The idea of phonon crystals is introduced into the design of pipe system conveying fluid. The vibration of pipe can be controlled by the band gap property. Considering the effect of the fluid-structure interaction, the band structure for the one-dimensional periodic pipe composed of two kind of materials or geometrical structure with plane wave expansion method is calculated. The periodic pipe system conveying fluid exhibiting axial vibration band gaps is found. The effect of the fluid-structure interaction depresses the gap frequency ranges. And the Poisson coupling and pipe wall thickness also influence the band gap frequency ranges and the width of the band gaps. The existence of band gaps in the periodic pipe system with fluid conveying provides a new technical way for pipe vibration control.

Key words: Phonon crystals, Pipe system conveying fluid, Vibration band gap