瞬态载荷作用下氦透平转子的时域响应分析

Time Domain Response Analysis of Helium Turbine Rotor under Transient Load

采用有限元法研究瞬态冲击下转子动力特性的时域响应,研究核聚变装置在实验过程中产生的交流损耗给氦透平膨胀机带来的冲击问题。同时研究了轴承刚度、阻尼和轴承间距等因素对转子的振动位移以及自我调节能力的影响。研究结果表明:瞬态冲击造成转子轨迹紊乱,扩大轴心运动范围,转子的最大振幅与载荷呈线性关系;增大刚度可有效减小转子的最大振幅;增大轴承的刚度、阻尼和跨距有利于提高转子自我调节能力,使其快速回到稳定状态。

Aiming at the problem of the shock to the helium turbine expander caused by the AC losses generated during the experimental process of the nuclear fusion device,the finite element method is used to study the time-domain response of the rotor dynamic characteristics under the transient shock.The effects of bearing stiffness,damping and bearing spacing on the vibration displacement of the rotor as well as the self-regulation capability are also investigated.The results show that transient shock causes rotor trajectory disturbances and widens the range of axial motion.The maximum amplitude of the rotor is linearly related to the load.Increasing stiffness can effectively reduce the maximum amplitude of the rotor.Increasing the stiffness,damping and span of the bearings will help to improve the self-adjusting ability of the rotor and make it quickly return to steady state.