可用度约束下2M1B生产系统设备预防维修策略优化研究

Research on Equipment Preventive Maintenance Strategy Under Availability Constraints

【目的】针对2M1B生产系统,提出了一种可用度约束条件下的设备预防维修模型,以预防维修周期和缓冲区库存量为自变量,以系统最低可用度要求为约束条件,以周期内单位时间总成本最小为优化目标,获得系统最优预防性维修周期以及最佳的缓冲区库存量。【方法】首先,针对2M1B生产系统的上游设备,通过更新酬劳理论计算设备周期内平均总维修费用;其次,通过分析缓冲区内库存的变化,得到周期内缓冲区库存的持有费用和缺货费用,建立系统周期内总费用模型;最后,在系统最低可用度要求的约束条件下,运用离散迭代对模型优化求解,得到最优预防性维修周期以及最佳缓冲区库存。【结果】通过案例分析,验证了模型的有效性。【结论】所建立的模型对2M1B生产系统确定最优预防维护周期和最佳缓冲库存是有效且实用的。

[Purposes]Aiming at 2 M1 Bproduction system,apreventive maintenance model with availability constraints is proposed.The preventive maintenance cycle and buffer inventory are independent variables,the minimum availability requirement of the system is constrained,and the minimum total cost per unit time in the cycle is taken as the optimization objective to obtain the optimal preventive maintenance cycle of the system,and the optimal buffer inventory.[Methods]First,according to the upstream equipment of 2 M1 Bproduction system,the average total maintenance cost in the equipment cycle is calculated by updating the compensation theory.Then,by analyzing the changes of the inventory in the buffer zone,the holding cost and the out-of-stock cost of the buffer inventory in the cycle are obtained,and the total cost model in the system cycle is established.Finally,the lowest total maintenance cost in the system can be obtained.Under the constraints of usage requirement,the discrete iteration is used to optimize the model,and the optimal preventive maintenance cycle and optimal buffer inventory are obtained.[Findings]The validity of the model is verified by case study.[Conclusions]The established model is effective and practical for determining the optimal preventive maintenance cycle and buffer inventory of 2 M1 Bproduction system.