Numerical simulation and experimental testing of dynamic stiffness of angular contact ball bearing

Haitao Luo,Jia Fu,Peng Wang,Changshuai Yu,Guangming Liu,Wei Wang

doi:10.1177/1687814018798973

Abstract

Angular contact ball bearings are widely used in the multiple rotor system, such as gear box, machine tool spindle, and aero-engine rotors. The support stiffness is very important to the vibration of shafting. In order to obtain the dynamic stiffness, a numerical simulation method for dynamic stiffness of angular contact ball bearings is presented. By means of LS-DYNA software, the displacement and stress curves of the bearing’s different components are obtained successfully, and then, the dynamic stiffness of bearing under certain working conditions also can be calculated. The maximum envelope radius of the inner ring of the measured bearing can be taken as the relative displacement change value of the inner and outer rings of the bearing. To obtain the dynamic stiffness, the test strategy for dynamic stiffness of the angular contact ball bearings is introduced. The experimental results show that the equivalent dynamic stiffness increases with the increase in the preload of measured bearing under certain conditions. The simulation result coincides with the experiments well. The research work can provide the basis for the design and dynamics analysis of the bearing rotor system and have important engineering significance to improve the service performance of angular contact ball bearings.

Highlights

Rolling bearing is widely used in high-speed rotors, such as machine tool spindles and aero-engines, because of their high rotation accuracy and strong bearing capacity.[1,2,3,4]
Comparing the dynamic stiffness simulation and experimental curves of 60TAC120B angular contact ball bearings, we can see that the dynamic stiffness of the bearing is only 1E7 N/mm when the rotation speed of the bearing is 1600 r/min and the preload is 0 N
When the preload rises to 2500 N, the dynamic stiffness of the bearing is close to 2E7 N/mm, which is twice as high as that without preload

Summary

Introduction

Rolling bearing is widely used in high-speed rotors, such as machine tool spindles and aero-engines, because of their high rotation accuracy and strong bearing capacity.[1,2,3,4] The bearing stiffness is an important parameter of the bearing, which exhibits strong time-varying characteristics and nonlinear characteristics under high rotation speed, variable load, and other complex operating conditions.[4,5] the bearing stiffness directly affects the dynamic characteristics of the spindle system.[5]. When the bearing is stressed, the bearing ball and the inner ring will be relatively deformed, and the position of steel ball center and the inner ring channel’s center of curvature will change, as well as the contact angles of the inner and outer rings. During the three-dimensional modeling and simulation analysis of the bearing, in order to improve the simulation accuracy and save the calculation time, the

11 Ball Poisson ratio

Conclusion