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- Title
1727. Time-dependent reliability analysis for a herringbone planetary gear set with failure dependency under random loads.
- Authors
Ying-hua Liao; Da-tong Qin; Chang-zhao Liu
- Abstract
A gear-bearing coupling dynamic model that includes bearing stiffness, mesh stiffness and mesh errors for a herringbone planetary gear set (HPGS) is proposed. The proposed model is used to predict the random stress process of the gears and bearings along with Monte Carlo simulation, when the effects of tooth surface wear on meshing errors are considered. A calculation model for the random strength process is derived by applying the linear fatigue damage criterion and regarding the Poisson random process as a counting process of the random stress. Assuming that the stress and strength are random processes, a time-dependent reliability model for HPGS with failure dependency is proposed to predict the time-dependent reliability of HPGS based on the failure mode groups that are obtained by the correlation coefficient. The results show that, the meshing errors caused by the tooth surface wear, make the dynamic loads and failure dependency of the parts of HPGS gradually increase over service time. At the same time the fatigue damage, which is caused by the load action, makes the strength of parts of HPGS gradually decrease over service time. Therefore the reliability of HPGS quickly decreases over service time. If the shafts of the planets and sun gear are free in their axial direction, the failure dependency of the parts will significantly decrease, and the reliability of a herringbone planetary gear set will significantly be improved.
- Subjects
GEARBOXES; RELIABILITY in engineering; IMPACT loads; DYNAMICS; MECHANICAL vibration research
- Publication
Journal of Vibroengineering, 2015, Vol 17, Issue 6, p2933
- ISSN
1392-8716
- Publication type
Article