Dynamic model of a deep-groove ball bearing including localized and distributed defects. Part 2: Implementation and results

The model of the ball bearing proposed in Part 1 is implemented and analysed using a commercial multi-body system software application (MSC.ADAMS). The effect of the diametral clearance of the bearing on the natural frequencies and vibration response of the rotor-bearing system is studied. The diametral clearance is found to have a significant effect on the level of vibration as well as on the natural frequencies. Low-order waviness, also known as out-of-roundness, is found to generate vibration at frequencies of the waviness order multiplied by the rotation speed. On the other hand, the waviness orders close to the number of balls in the bearing (z+/-1 and z) are found to generate vibrations at the ball passage inner ring and ball passage outer ring frequencies. Various excitations produce sum and difference frequencies. Localized defects in the inner and outer ring are found to generate vibrations at bearing defect frequencies. The simulation results are in line with the analytical and experimental results available in the literature.