液体输送管道固液耦合振动的有限元分析  

FEM Analysis for Fluid-structure Coupling Vibration of Fluid-conveying Pipe

作　　者：许萍[1] 李著信[1] 蒋忠[2] 

机构地区：[1]解放军后勤工程学院,重庆400016 [2]西南油气田分公司输气管理处,四川成都644600

出　　处：《管道技术与设备》2004年第6期3-5,共3页Pipeline Technique and Equipment

摘　　要：针对在工程中常见的液体输送管道 ,根据Hamilton原理 ,使用有限元法推导了管道的固液耦合振动方程。通过求解振动方程组的特征值得到管道的固有频率及临界流速 ,并讨论了液体的流速、压力变化对管道固有频率的影响。计算结果表明 ,管道的固有频率随流速的增大而降低 ,当流速等于或大于临界流速时 ,管道将发生静力失稳。The fluid-conveying pipe commonly used in industry was investigated.The fluid-structure coupling vibration equation of the pipe was established following the Hamilton principle and using finite element method.The solution of the vibration equations gave the natural frequency and critical velocity of the pipe.The influence of flowing velocity and pressure on the pipe's natural frequency were discussed respectively.Numerical result shows that the natural frequency of the pipe reduced with the flowing velocity increased.When the flowing velocity increased to the critical velocity,the pipe will lose stability.

关 键 词：输液管道 固液耦合 临界流速 有限元法 

分 类 号：U177.8[交通运输工程]