中文摘要：

充液管路的固液耦合振动广泛存在于各种工程领域中,对其振动控制进行研究具有重要意义。将声子晶体思想引入到管路结构设计中,将管壁设计成周期性结构,可以利用带隙特性实现管路的振动控制。利用平面波展开法,计算固液耦合条件下的周期管路结构轴向振动能带结构。计算表明,周期管路结构的轴向振动存在振动带隙,液体耦合效应使振动带隙的频率范围降低。同时分析泊松耦合、管壁厚度等因素对带隙频率范围和宽度的影响。充液周期管路结构的振动带隙特性为管路的振动控制提供了一条新的技术途径。

英文摘要：

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.