Nonlinear Dynamic Behavior of Angular Contact Ball Bearings under Microgravity and Gravity

Aero space mechanism experiences ground based tests and space operation. Significant difference in gravity environment has a great effect on the performance of rolling bearings used in spacecraft, especially when the assembly mass is large. This paper aims to explore the difference of dynamic behaviors of gyroscope bearings operating in microgravity and gravity environments, which lays a foundation for the optimal design and failure analysis of gyroscope bearings. To this end, a dynamic model considering the interaction between balls and raceways, cage and guiding surfaces was established, which revealed the difference of dynamic behavior under gravity and microgravity. The skidding, impact and motion stability inside a bearing with different operation conditions and shaft assembly mass were investigated. The results show that the impact force between ball-cage pockets is much smaller and more uniform under microgravity; the cage motion under microgravity is more stable, while it gradually varies from regular to irregular patterns with the increase of shaft assembly mass under gravity.