中文摘要：

从水轮发电机转子的气隙磁场能表达式出发,推导发电机转子的弯曲及扭转电磁刚度表达式。建立了考虑弯曲和扭转电磁刚度的水电机组转子轴承系统的弯扭耦合振动模型。研究了弯曲和扭转电磁刚度在不同导轴承刚度支承情况下对转子轴承系统弯扭耦合振动的参与耦合作用,探讨了导轴承刚度和集中阻尼对系统弯扭耦合振动特性的影响。结果表明,两种电磁刚度对弯振及扭振幅值的影响存在相互激发放大作用,轴承刚度及集中阻尼虽然对弯振及扭振的影响规律略有不同,但均是不可忽视的因素。

英文摘要：

A formula for calculation of bending and torsional electromagnetic stiffness was derived from the expression of magnetic field energy in the hydro generator rotor air gap. A bending and torsional coupled vibration model was developed for the hydroelectric generating set rotor-beating system with consideration of these stiffnesses. This model was used to examine the coupling effect of the two stiffnesses on bending-torsional coupled vibrations in different conditions of journal bearing support and to study the influence of centralized bearing damping on the fea~res of coupled vibrations. The results show that the two electromagnetic stiffnesses produce an effect of coupled excitation and amplification on the amplitudes of bending and torsional vibrations. The stiffness and centralized damping of journal bearing have important effects on the coupled vibrations, though a slight difference appears between the effects on bending vibration and torsional vibration.