Abstract
First of all papers by the facts, analysis of rotating machinery and the development of its people's higher requirements.This article unifies predecessor's achievement, conducts the researchto the rotor - bearing system. using the stable state bearing theory, Film of the model of the nonlinear vibration characteristics of the oil film nonlinear vibration of the Journal under the whirl trajectory, before and after the instability of the spectrum and the characteristics of a detailed analysis，through the dos system callrotor - bearing procedure, carries on the computer simulation. Through the calculation, to have different speed, different amount of imbalance in the Journal vibration data, and then use the software origin, drawn Journal vibration whirl trajectory and frequency spectrum. Comparing different speed, different amount of imbalance in the whirl Journal vibration path of non-linear features. Analysis of that whirl through the centre of the track changes in process, through graphics, the specific comparison speed, imbalance of the Journal vibration whirl track the impact.
Key words: Rotor-bearing system Nonlinear Speed Unbalance
