Analysis of Vibration Model to Study the Effect of Defect Sizes and Load on Stiffness, Contact Deformation, and Contact Force Variation in Deep Groove Ball Bearing

Abstract

In this paper, the vibration model has been suggested to study the local defects in the deep groove ball-bearing system. MATLAB is used to solve the equations governing the bearing system to simulate its vibration signals. The vibration model of the deep groove ball bearing system is constructed and takes into account the masses of the housing, balls, races, and shaft in addition to the damping at the ball-race interface and different-sized race defects. The effect of different defect sizes on the measured load distribution has been analyzed and discussed. The contact deformation and load distribution for a fault-free bearing system as well as for faults with βball=50 and 400 circumferential extents are measured and displayed for interpretation. Due to de-stressing and losing all or some of its ability to support a load, the load that a ball placed inside the defect zone previously carried has been split between the balls outside of the defect region. This implies that balls lose all or part of their load-bearing capacity when they are positioned in the defect zone, increasing the static loading on the raceway sections without any defects. Moreover, it is seen that the radial clearance, applied load, and defect shape all significantly affect the load redistribution that follows the loss of load-bearing capacity.