NUMERICAL ANALYSIS OF UNSTABLE MOTION OF ELLIPTIC BEARING-ROTOR SYSTEM

The oil film force produced by hydrodynamic journal bearing is a kind of highly nonlinear force. The hydrodynamic bearing rotor system is a typical nonlinear dynamic system. Using linear stability theory, the motion after loss of stability can not be obtained. In this paper, a method of transient numerical simulation to simulate and analyze the nonlinear vibration of rotor bearing system is presented. Using this method, the motion after loss of stability of an elliptic bearing rigid rotor system is calculated and analyzed in detail.