In this paper, the stress response characteristics of a straight hydraulic pipe subjected to random vibrations were studied. The motion equation of the straight hydraulic pipe subjected to random vibration was established by utilizing the finite element method (FEM), and considering the fluid-structure interaction (FSI). The discrete analysis method was employed to solve the motion equation of the straight hydraulic pipe. The effects of different parameters, including the external excitation, fluid velocity, fluid pressure, and the pipe's structural parameters on the stress response of the straight hydraulic pipe were investigated. The numerical results showed that the maximum mean square values of the pipe stress occurred at the support points of the pipe; the maximum mean square value of the pipe stress increased with an increase in the random acceleration variance, pipe wall thickness, pipe inner diameter, and fluid pressure and decreased with an increase in the pipe length and fluid velocity. The experimental results agreed well with the numerical results, demonstrating the accuracy of the motion equation of the straight hydraulic pipe subjected to random vibration.

本文研究了液压直管在随机振动作用下的应力响应特性。利用有限元法(FEM)，考虑流固耦合(FSI)，建立了随机振动作用下液压直管的运动方程。采用离散分析法求解液压直管运动方程。研究了外激励、流体速度、流体压力、管道结构参数等不同参数对液压直管应力响应的影响。数值结果表明，管道应力的最大均方值出现在管道的支撑点处；管道应力的最大均方值随着随机加速度方差、管道壁厚、管道内径和流体压力的增加而增加，并随着管道长度和流体速度的增加而减小。实验结果与数值结果吻合较好，证明了液压直管在随机振动作用下运动方程的准确性。