摘要
采用有限元法建立实际200MW汽轮发电机组低压段转子-轴承系统非线性动力学方程,采用固定界面模态综合法对其进行降维计算,使系统由原来的112个自由度降为现在的8个自由度,从而显著的提高了数值计算分析的效率.基于椭圆瓦油膜力模型下的低压转子-轴承系统,采用Lung-Kutta法对降维后非线性动力学方程进行计算,分析了转子升降速过程的运动状态和分岔类型.
The nonlinear dynamical model of the low-pressure rotor-bearing of the 200MW turbine set system is established by FEM using the fixed-interface component mode synthesis procedure.The number of degrees of freedom is reduced sharply from 112 to 8,and computing efficiency is increased remarkably.The nonlinear dynamical model of the low-pressure rotor-bearing system by ellipse bearing which reduced dimensions is presented,and the Lung-Kutta method is applied to solve the equation of motion.The state of motion and type of the bifurcation of the nonlinear dynamical of low-pressure rotor-bearing system is simulated separately during the speed ascending and descending process.
出处
《哈尔滨商业大学学报（自然科学版）》
CAS
2010年第5期611-618,共8页
Journal of Harbin University of Commerce：Natural Sciences Edition
关键词
实际机组
低压转子-轴承系统
降维
非线性动力学
分岔
actual turbine set system
low-pressure rotor-bearing
dimension reduction
nonlinear dynamical
bifurcation
