Dynamic characteristics of asymmetrically supported cylindrical roller bearing–rotor coupled system considering variable compliance vibration

This article provides a dynamic model of a cylindrical roller bearing–rotor system by combining the finite element method of the rotor and the interaction between the components of the bearing to study the dynamic response of the rotor with asymmetric support mode. The shaft is discretized by beam elements with five degrees of freedom. The bearing inner ring is consolidated with the journal of the shaft. The simulation results show that variable compliance vibration can stimulate resonance of the rotor in the sub-critical speed region. The variable compliance vibration of the rolling bearings does not occur synchronously on both sides of the asymmetric supported rotor. The increase in radial load and clearance exacerbates variable compliance vibration, while rotor imbalance has a smaller impact on variable compliance vibration. Usually, the presented coupled model can be applied to the comprehensive analysis of the vibration characteristics of all components in any cylindrical roller bearing–rotor system.