Abstract
Roller bearing is one of the most widely used and critical elements in rotating machinery. In consequence, bearing fault diagnosis in machines, as well as to discriminate the different fault conditions have been a great interest. In this study, firstly, analytical model of a shaft-ball bearing system is developed. The shaft is assumed to be perfectly rigid and uniform, and supported by two radial ball bearings. Then, the effect of localized defects on bearing running surfaces (i.e. surfaces of inner and outer rings and balls) on the shaft vibrations are obtained using the simulation program. Then, vibration signatures are analyzed by one-way analysis of variance (ANOVA) method. Finally, post-hoc tests are applied to differentiate the ball bearing element's localized defects in shaft-ball bearing simulation model.
Highlights
Breakdowns in rotating elements cause time and economical losses due to malfunction of their components
An analytical model of the system is developed and the effects of localized defects on bearing running surfaces on ball bearing vibrations are obtained by using the simulation program
The vibration signatures caused by roller bearing faults have been analyzed
Summary
Breakdowns in rotating elements cause time and economical losses due to malfunction of their components. Most failures of rotating machinery have roots in the damage of rolling element bearings, such as fatigue crack, spalling on the races or rolling elements [1]. Single point defects begin as localized defects which include cracks, pits and spalls on the rolling surfaces on the raceways or rolling elements, and, as the rolling elements pass over these defect areas, small collisions occur producing mechanical shockwaves. This process occurs every time a defect collides with another part of the bearing [3]
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