关键词: 调整因子, 可靠性, 预防性维护, 修复非新, 成本

Abstract: System reliability was always neglected by Equal interval Preventive Maintenance (PM) models，meanwhile long-time expected interval PM models usually couldnt satisfy the system maintenance need in a finite time horizon. From this perspective, a sequential imperfect PM model was proposed with the consideration of optimized maintenance schedule in a finite time horizon. A hybrid hazard rate recursion rule was developed based on the concept of age reduction factor and hazard rate increase factor to predict the evolution of the system reliability in different maintenance phases. The optimized PM schedule was deduced by minimizing the maintenance cost in the finite time horizon with the assumption that the mean cost per unit time for PM was a function of the reliability threshold R and the improvement factors. Simulation results showed that this reliability centered PM model made a decrease of the PM interval and it could provide maintenance decision support for job shop scheduling.

Key words: improvement factor, reliability, preventive maintenance, imperfect maintenance, cost