Abstract: Taking the rotor-bearing system of a steam turbine as the research object, considering the influence of the shaft gyro moment and moment of inertia, the finite element model of rotor-bearing system dynamics is established . The dynamic response characteristics of the rotor-bearing system under earthquake excitation are studied by inputting different ground motion peak acceleration and changing phase angle in X direction and X-Y direction. The equivalent stress and displacement trends of key nodes in rotor-bearing system are analyzed, and the safety of turbine rotor-bearing operation under seismic load is discussed. The aim is to provide a theoretical reference for the seismic design of rotor-bearing system.

Key words: Rotor-bearing system, Earthquake excitation, Equivalent effective stress, Displacement, Safety

摘要： 以某汽轮机转子-轴承系统为研究对象，考虑轴系陀螺力矩和转动惯量的影响，建立了转子-轴承系统动力学有限元模型。通过在X方向和X-Y方向输入不同的地震动峰值加速度并改变相位角的方法，研究了转子-轴承系统在地震激励下的动力响应特性。分析了转子-轴承系统关键节点的等效应力和位移变化趋势，讨论了地震载荷作用下汽轮机转子-轴承运行的安全性，旨在为转子-轴承系统的抗震设计提供一定的理论参考。

关键词: 转子-轴承系统, 地震激励, 等效应力, 位移, 安全性