阻尼器-滑动轴承-转子系统的非谐调运动及突跳特性分析

挤压油膜阻尼器—滑动轴承—柔性转子系统是一类强的非线性动力系统，其中包含一些复杂的非线性现象，文中主要对系统的非谐调运动、突跳行为进行了理论分析。研究表明：系统存在二次Ｈｏｐｆ分岔，并导致准周期运动；存在重复的倍周期分岔，导致次谐运动；突跳是鞍—结分岔产生的结果。

NONSYNCHRONOUS MOTION AND JUMP PHENOMENON OF ROTOR-FLUID FILM BEARING SYSTEM WITH SQUEEZE FILM DAMPER

The dynamical behaviors of a flexible rotor-fluid film bearing system with squeeze film damper are investigated.Owing to the nonlinearity of the film forces, there are many complex phenomena in the system,such as:jump,nonsynchronous motion etc.As the parameters are varied,the system can undergo a series of bifurcations.It is found that the secondary Hopf bifurcation,a series of period-doubling bifurcation and the saddle-node bifurcation result in quasi-periodic motion,subharmonic adoption motion and jump phenomenon respectively.The results of this study show that the introduction of squeeze film dampers in this system may lead to undesirable nonsynchronous vibrations.