以某典型核电站主蒸汽管道 － 防甩件系统为研究对象，采用有限元法分析管道 发生假想破口后的甩击特性。首先建立管道 － U 型箍防甩件的三维有限元模型，测试材 料力学性能参数，根据高能管道假想破口力学模型分析了流体喷射力，基于试验结果验证 模型的准确性，然后分析管道的甩击力、位移、甩击速度和系统能量变化规律，最后研究悬 臂长度、摩擦系数和初始间隙对管道甩击特性的影响． 研究结果表明:管道撞击 U 型箍后 保持稳定的小幅振动，甩击速度急剧增大后迅速下降至零值，甩击力呈 150 Hz 的周期性 波动，喷射力做功转化为管道和 U 型箍的应变能;管道竖向位移随悬臂长度的增大而增 大，甩击力随摩擦系数的增大而增大，甩击力还随初始间隙的增大而增大．

The pipe whip behaviour of a high energy pipe in a nuclear power plant under assumption of postulated ruptures was investigated by using the finite element method． A three-dimensional finite element model of the pipe and U-bolt restraint was built，the structural parameters of them were tested experimentally，the thrust force caused by jet flow was calculated based on the jet thrust equation，and the accuracy of the model was verified with reported experimental results． Then，the time traces of restraint force，displacement，velocity and the energy of the system were analyzed． Finally，the effects of overhang length，friction coefficient and clearance on the pipe whip behaviour of the pipe-restraints system were discussed． The research results show that the pipe oscillates with small amplitude after impacting on the U-bolt restraint，the impact velocity increases suddenly to a maximum val- ue，and then decreases rapidly to zero，and the impact force undergoes 150Hz periodic oscillation． The work done by thrust force is almost converted to strain energy． The vertical displacement of pipe increases with increasing o- verhang length，whipping force increases with increasing whipping friction coefficient and increasing primary clea- rance．