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.
出处
《管道技术与设备》
CAS
2004年第6期3-5,共3页
Pipeline Technique and Equipment
关键词
输液管道
固液耦合
临界流速
有限元法
Fluid-conveying Pipe
Fluid-structure Coupling
Critical Velocity
Finite Element Method
