角接触球轴承-转子加减速过程动力学分析

Angular contact ball bearing significantly affects the performance of bearing-rotor system. A dynamic model for bearing-rotor system is established with comprehensive consideration of interactions between bearing elements. The traction force between ball and raceways is evaluated based on elastohydrodynamic lubrication theory; the interaction between ball and cage is modeled as the compression of spring with high rigidness, while Petroff's bearing model is utilized to calculate the friction force between guiding ring and cage. The dynamic model is efficiently solved based on the fourth order Runge-Kutta algorithm. The effects of lubricant density and viscosity, guide mode of cage and axial preload on the process of startup and stop are investigated based on the developed dynamic model. The results show that, the lubricant with high density and viscosity will delay the startup process but accelerate the shutdown process; inner ring guide mode will make the startup process of bearing slow; when the axial preload is not large enough, there is sever skidding between ball and raceways during startup and steady state running process.