弹性转子-滑动轴承系统稳定性分析

对一人考虑不平衡力和非线性油膜力的弹性转子 -轴承系统 ,用数值方法研究其稳定性和油膜失稳运动 (自激振动 )特性 ;推导出转子受冲击的运动模型 ,并分析了冲击对系统稳定性的影响规律。

Analysis on Stability of Elastic Rotor/Bearing System

In the first part of this paper, the stability and instability motion of an Jeffcott rotor/bearing system is studied by using numerical method to reveal the instability way of the system as its rotating speed increases. The instability margin of the system is found out, which shows that the system loses its stability through quasi periodic or period doubling bifurcation, and comes into the absolute instability margin if it speeds up continuously. In the second part, a mathematical model of a rotor with impact event is derived by impulse law, which is then used to investigate the influence of the impact on the stability of the rotor/bearing system. The results show that a certain level of impulse force can make the rotor lose its stability too, and come into period doubling motion.