可靠度限制下弹性周期预防维修模型

目前对预防性维修策略的研究大多都基于固定的预防维修周期T，但实际生产中，每一次预防维修后设备的故障率不会降到零，且以更快的速度增长，因此预防维修周期也应相应地变化。本文运用故障率增加因子和役龄回退因子来刻画每一次预防维修后设备故障率的演变规律，以每周期内单位时间的最小成本为目标，并将每次预防维修前的可靠度进行最低的限制，以此来确定最佳的弹性周期预防维修策略，最后通过实例计算与定周期进行比较，说明其经济性，能够为实际生产提供决策支持。

Flexible cycle preventive maintenance model based on reliability constraint

The current study on the preventive maintenance strategies is mostly based on a fixed cycle T.However,in the actual production after each preventive maintenance of equipment,the failure rate will not reduce to zero,and will then increase at a faster speed.Therefore the preventive maintenance cycle should be changed accordingly.In this paper,both the failure rate increasing factor and age reduction factor are used to characterize the evolution of the failure rate after each preventive maintenance.In order to determine the best strategy for flexible cycle preventive maintenance,the smallest cost in unit time for each cycle is the target,and the reliability is limited to a minimum threshold value.Finally compared with the fixed cycle model,it shows that the new model is more effective and can provide decision support for the actual production.