Research On Nonlinear Dynamic Of Double Disk Rotor-Bearing System Supported By Oil Film Force

Rotor as an important composition of the rotating machinery, which running stability and safety is related to the safe operation of the whole rotating machinery. Because of the existence of the oil film force and rubbing force, it leads to strong nonlinear in rotor system.As the change of some parameters of the rotor system can lead to change of the form of system movement. So the reasonable parameters design and proper work speed can make the rotor system run more smoothly, safely and efficiently.On the basis of the rotor dynamics theory, this article mainly studies the dynamic behavior of the simplified model of double disk rotor system and the double disk rotor system supported by oil film force. According to Newton’s second law, motion of the differential equation in the system is abtained. Then the numerical simulation is used to abtain the bifurcation diagram, the axis locus diagram, the time history map and the Poincare map. The effects of various parameters of the system on the response of the rotor system are analyzed.Research results show that the double disk rotor system support by oil film force is concerned.With the increase of stator stiffness, the interval of chaotic motion appears in the response of the rotor system increases gradually. With the increase of the damping value, the chaotic motion area in the middle speed range of the rotor is gradually reduced, but when the damping value reaches a certain value, the chaotic motion will reappear. With the increasing of eccentricity of the rotor, multi periodic motion and chaotic motion area more and more appear in high speed interval. The entire rotor system is gradually becoming unstable. With the increase of the disk mass, the rotor can be changed from single period to chaotic motion and multi period movement in the medium speed range, but in the high speed range, the rotor can be changed into periodic motion by chaotic motion. And the effect of friction coefficient on the rotor response is not obvious. In the medium speed and high speed range, with the increasing of the rotor in the bearing quality, the rotor will from the chaos and more periodic motion gradually into a single periodic motion. So it should be based on the influence of the parameters change on the system movement, and design the reasonable parameters of the rotor system. Making the rotor in working rotational speed range can submit periodic motion,as far as possible to avoid in the state of the chaos motion. Through the study of the rotor system dynamics, the optimization design of the rotating machinery system in industrial production provides some theoretical basis and design criteria.