Zhao Sanxing,Ma Xizhi,Xu Hua,Zhu Jun
(Theory of Lubrication and Bearing Institute,Xi'an Jiaotong University,Xi'an 710049, China)
Abstract：The motion equations have been adopted for single-disk symmetric viscous-elastic rotor-bearing system, and nonlinear oil-film force of finite journal bearings is calculated. The journal and the disk motion have been simulated with fourth-order Runge-kutta method. The threshold speed based on linear theory is given. Dynamic behaviors of balanced rotor and responses of unbalanced rotor are investigated respectively. The complexity of influence of eccentricity mass on system working characteristic has been analyzed. It has been found that linear theory can be used for computing response of unbalanced rotor only when unbalanced eccentricity is small.
Keywords:finite journal bearing;nonlinear oil-film force;viscous-elastic rotor;stability;
response of system