Vibration of bending-torsion coupling gear-rotor-rolling bearing transmission system

A nonlinear dynamic model of bending-torsion coupling for gear-rotor-rolling bearing transmission system was estabished, with consideration of the gear meshing, torsion effect, input/output, and bending/torsion vibration of gear shaft. The dynamic differential equation was deuced based on the imbalanced gear-rotor-rolling bearing of bending-torsion coupling. Considering the gear eccentricity and nonlinear contact of rolling bearing, the influence law of parameters, including the speed, eccentric distance and bearing clearance, etc, on the system vibration response was analyzed. Result show that, an obvious component of rotational frequency of driven shaft existed in the driving shaft, due to the effects of bending-torsion coupling. However, the frequency of every rotation and engagement of shaft was more obvious in the torsional vibration. Given the rolling bearing's own resonance frequency, the effect of the variable stiffness frequency of rolling bearings on the system should be avoided during the system design. The change of gear eccentric distance also affects the time and frequency response of system. Besides, the bearing clearance also affects vibration response of the system. So a suitable bearing clearance is suggested to reduce the vibration amplitude of every part of system.