退化相关多部件系统预防性维修决策模型

在复杂多部件系统维修决策过程中通常需要考虑部件间故障相关关系,基于部件退化速率受其自身和相关部件累积退化量影响的思想,建立退化相关多部件系统退化过程解析模型,之后在非减退化过程假设下得到系统和部件可靠度函数。在此基础上,提出针对不同部件的预防性维修策略,并以单位时间维修费用最小为目标构建维修决策优化模型。最后,通过两部件系统算例分析,对所提可靠度模型精确度进行检验,并得到系统最优预防性维修策略,验证维修决策模型的合理性和有效性。

Preventive maintenance decision model of multi-component system with degradation interaction

In general, the dependent failure among different components is considered in maintenance decision of the complex multi component system. The degradation process analysis model of the degradation interaction multi componerit system is built considering the degradation rate of one component is affected by the degradation levels of dependent components. On the basis of non decreasing degradation assumption, the reliability functions of the system and components are derived. Then, the preventive maintenance policy for different component types is put forward, and the maintenance decision model with the goal of minimal per unit cost is built. Finally, taking a two component system as an example, the accuracy of proposed reliability models is examined, and the optimal preventive maintenance policy for the system is derived, which verifies the reasonability and effectiveness of the maintenance decision model.