关键词: 随机退化, 随机冲击, 多部件系统, 状态维护, 风力机系统

Abstract: To guarantee system running safely and reduce the maintenance cost,a condition-based maintenance model was proposed aiming at the stochastic degradations of multi-component wind turbine.Non-stationary gamma process and non-homogeneous poison process were introduced to model the interactive degradation process of normal and stochastic shock respectively.By combining two failure modes of set up time and maintenance time,self-announced failures and latent failures,a condition-based maintenance model based on stochastic degradation was presented with renewal theory.The relationship between the expected maintenance cost and the inspection intervals under different degradation factors and shock factors was analyzed by experiments,and the result showed that the proposed model was valid and practical for maintenance decision-making of multi-component systems.

Key words: stochastic degradation, stochastic shock, multi-component system, condition-based maintenance, wind turbine system