Abstract
This paper presents a nonlinear dynamic analysis model of ball bearing with local defects, and the mechanism of vibration caused by defects on the outer race, inner race and ball of the bearing is analyzed. The contact between the ball and the raceways are considered as spring–damper system, and the reaction of the local defect with its matching element is represented by a mathematical model rather than a short-term impulse. The time and frequency-domain characteristics of the simulated vibration signals obtained under different faults are compared with the experimental vibration signals, which verify the validity of the developed mechanical models. And the results can provide theoretical support for rotor-bearing dynamics, reliability analysis and fault diagnosis.
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