Abstract: In order to investigate the dynamic characteristics of double row angular contact ball bearings under complex external load conditions, a 5-DOF pseudo-static numerical analysis modelling of double row angular contact ball bearings is established based on the nonlinear elastic Hertzian contact theory and elastic hydrodynamic lubrication theory, the improved Newton-Raphson cross iterative algorithm is used to solve the above numerical analysis modelling. The proposed modelling takes into account the influences of centrifugal force, friction force, gyro moment, bearing clearance, oil film thickness and bearing configuration comprehensively, the longest iteration solution time is less than 2 s. By comparison, the maximum deviation of displacement and stiffness under back-to-back configuration is no more than 3.3% and the maximum deviation of diagonal stiffness under different configurations is no more than 8.6%, which verify the validity of the presented modelling. The research results show that under different bearing configuration, the contact angles of inside and outside ring have extremum at 180°position azimuth, the contact forces of inner and outer ring are the same and exist a phenomenon that the contact forces are zero; Compared with other bearing configurations, the bearing stiffness with tandem con-figuration increases with axial force increased, is at lower level with radial force and torque increased and weakens significantly with speed increased, it can conclude that the capacity of radial and torque of bearing with series configuration is insufficient and not suitable for high speed working conditions; The angular stiffness of bearing with face to face configuration is at a low level with external load increased, it can conclude that the capacity of torque is insufficient.

Key words: double row angular contact ball bearing, bearing configuration, contact angle, contact force, bearing stiffness