Dynamic Modelling for Calculating Comprehensive Stiffness of Cylindrical Roller Bearing

Abstract

The rotor system supported by the rolling bearing is widely used in various fields such as aviation, space, and machinery due to its importance. In the study of the dynamic characteristics for rolling bearings, it is important to accurately calculate the strength of the rolling bearings. The strength of rolling bearings is very important in the analysis of the vibration characteristics of the rotor system. Therefore, in this paper, the method of creating a comprehensive strength model of the rolling bearing is mentioned. Firstly, the contact strength of the rolling bearing was calculated according to the Hertz theory. Here, the radial strength was calculated through the geometric analysis and load analysis of rolling bearings. And then, the thickness of the oil film was determined according to the elastohydrodynamic lubrication theory. Rolling bearings are generally in an elastohydrodynamic lubrication state during the working process, and there is an elastic lubricating film between the rolling elements and the raceway. After determining the thickness of the oil film, the strength of the oil film was determined according to the definition of strength. Then, a comprehensive strength model of the rolling bearing was prepared by synthesizing the deformation stiffness of the bearing and the stiffness of the lubricant film. This dynamic model provides a theoretical basis for the study of the vibration performance of rotor systems supported by rolling bearings.