关键词: 车辆工程；可靠性；齿面磨损；腐蚀；性能裕量

Abstract: In order to solve the problem of wear reliability prediction of gears in urban rail vehicles in corrosive environment, the nonhomogeneous Poisson process and the logarithmic Gaussian distribution were adopted to characterize the initiation and growth of corrosion pits on the tooth face. And then, considering the change of the wear and tear on the depth of corrosion pit, the maximum cumulative wear depth was taken as key parameter to establish the performance margin degradation model based on Archard wear theory, by analyzing the influence of corrosion pit on the Hertz contact stress and the tooth surface roughness. A reliability analysis model of gear wear of urban rail vehicles considering corrosion was constructed, and the reliability sensitivity analysis of parameters involved in corrosion process was also carried out. The results show that with the increase of working time, the uncertainty of cumulative gear wear increases, and the influence of corrosion on gear wear reliability decreases. The sensitivity of the proportion parameter, shape parameter and maximum corrosion depth in the corrosion pit growth process to the reliability increases in turn, and all of them are negatively correlated with the reliable life of gear wear.

Key words: vehicle engineering; reliability; gear wear; corrosion; performance margin