基于模糊理论的设备多目标预防性维护策略研究

Research on Multi-Objective Preventive Maintenance Strategy Based on Fuzzy Theory

【目的】针对当前生产设备多为单一目标维护决策的不足,同时考虑维护成本率和设备可用度,提出了一种基于模糊理论的多目标预防性维护策略模型。【方法】针对设备的衰退过程,结合役龄递减因子和故障率递增因子的混合故障率来描述设备的衰退特性;在此基础上,以可靠性阈值和预防维护次数为决策变量、设备维护成本率和设备可用度为目标函数建立设备多目标预防维护策略模型,基于模糊加权平均算法求解多目标维护决策模型。【结果】在仅以维护成本率为决策目标时,最优可靠性阈值为0.7,最优维护次数为5;在仅以设备可用度为决策目标时,最优可靠性阈值为0.7,最优维护次数为2;在多目标情况下偏重维护成本率时,最优可靠性阈值为0.7,最优维护次数为4;在多目标情况下偏重设备可用度时,最优可靠性阈值为0.7,最优维护次数为3。【结论】设备多目标预防维护策略模型更具灵活性,更加符合实际情况。

[Purposes]In order to solve the problem that most of the current production equipment is a single objective maintenance decision,and consider maintenance cost rate and equipment availability,a multi-objective preventive maintenance strategy model based on fuzzy theory is proposed.[Methods]Firstly,the recession process equipment combined with recursion decline factor and failure rate of the mixture of factor to describe the equipment failure rate decline characteristics.Secondly,on this basis,the multiobjective preventive maintenance strategy model of equipment is established by taking reliability threshold and preventive maintenance times as decision variables and equipment maintenance cost rate and equipment availability as objective functions,the fuzzy weighted average algorithm is used to solve the multi-objective maintenance decision model.[Findings]When only maintenance cost is the decision target,the optimal reliability threshold is 0.7,and the optimal number of maintenances is 5.When only equipment availability is the decision objective,the optimal reliability threshold is 0.7,and the optimal number of maintenances is 2.When the maintenance cost rate is emphasized in the multi-objective situation,the optimal reliability threshold is 0.7 and the optimal maintenance times is 4.When the availability of equipment is emphasized in the multi-objective situation,the optimal reliability threshold is 0.7 and the optimal maintenance times are 3.[Conclusions]The multi-objective preventive maintenance strategy model of equipment is more flexible and more in line with the actual situation.