A Thermal Preload Analysis Method of Angular Ball Bearing Considering Temperature Rise

This study designed a method to determine the relationship between axial preload, temperature, and dynamic characteristics. The ball-bearing dynamic model analyzed the dynamic characteristics of a ball bearing subjected to axial preload and thermal expansion based on the Hertz contact and gyroscopic moments. By increasing the temperature, the inner contact state of the ball bearing was altered, resulting in reduced vibration of the rotor system and increased stiffness of the rotor system. Simulation data indicated that at a temperature of 40 °C, the corresponding loads of both the inner and outer rings exhibit an increase of 5.2% and 5.1%, respectively. Experimental data suggested that as the temperature increased, both the peak-to-peak and root-mean-square values of the rotor vibration decreased, while the rotor stiffness exhibited a linear increase with rising temperature. This study provided a real-time temperature control method for vibration control of rotor system.