快锻油压机高压管道的振动分析

Vibration analysis of high pressure pipe for fast forging hydraulic press

针对80kN快锻压机管系振动问题,分析了压力管道振动原因,采用有限元方法,重点对高压管段进行了模态分析与谐响应分析;为避免管道结构共振,分析了增加管夹支承及改变支撑性质对管道振动频率、应力、应变的影响。同时考虑了存在预应力管道的模态分析,得出预应力的存在会使管道固有振动频率略微增加。通过对高压管道进行了流场分析与单向流固耦合作用下动力学分析,获得了管道中流体速度、压力的分布规律与应力、应变云图,得到管道动态力作用下的危险部位,分析结果对快锻压机管道结构设计具有一定理论与实践意义。

Aiming at the pressure pipe vibration issue of 80kN fast forging hydraulic press, the reason has been analyzed. The finite element method has been used to conduct the modal analysis and harmonic response. In order to avoid the pipeline structure resonance, the influence of additional pipe support and changing support property to the pipe vibrating frequency, stress, and strain has been analyzed. The modal analysis of the pre-stress pipeline has been considered. It is obtained that the pre-stress can increase the natural vibrating frequency a little bit. By analysis of the flow field and one direction fluid-structure coupling kinetics to high pressure pipeline, the distribution law of fluid velocity ＆ pressure has been obtained as well as stress and strain cloud chart. The dangerous parts of the pipeline under pipeline dynamic force have been obtained. The analysis results have a certain theoretical and practical significance for pipeline structure design of forging press.