Dynamic Analysis of the Bearing-Rotor System with the Variation of Cage’s Pocket Hole Diameter

Ceramic bearings are widely used in industrial production. They can be used to maintain accurate operations over a long period of time. However, the bearing model that was so thoroughly investigated has not been adapted for ceramic bearings. To better calculate the characteristics of ceramic bearings, the existing model may be modified to account for the high stiffness of ceramics. In this paper, the vibration response is investigated and used to modify the analytical model of bearing-rotor dynamics. Under the influence of thermal deformation, the dynamic parameters of the bearing components, including stiffness, traction forces, and Hertz contact force, are analyzed first. On the basis of the modified dynamic model, the vibration response of the bearing-rotor system, time domain, Poincaré phase diagram, phase trajectory, and bifurcation diagram are simulated under various cage pocket hole diameters. The simulation results indicate that increasing the cavity diameter can appropriately improve the dynamics of the rotor system at high speeds. The established model is highly accurate, with an error of less than 8% when comparing the simulation and experimental results. The study’s relevance to bearing structural design has been confirmed.