民航发动机车间维修能力近似平均值分析方法

为了评估民航发动机维修车间在当前维修能力下可保持的机队规模,提出了车间维修能力近似平均值分析方法。采用扩展随机Petri网建立了发动机在维修车间的转移模型,利用单维修等级下系统的性能指标对多维修等级性能指标进行了修正,采用平方变差系数方法实现服务时间从指数分布向正态分布的逼近,并评价了多等级与服务时间为正态分布的车间维修能力,分析了近似平均分析法与仿真方法的计算结果。比较结果表明:各维修中心等待队长最大相对误差为9.14%,此时零件检查、手工修理及机械加工为限制维修车间能力的瓶颈,因此,近似平均值分析方法是有效的。

Approximate mean value analysis method of maintenance ability for civil aeroengine maintenance workshop

To evaluate the scale of aeroengines fleet under the available maintenance capacity of civil aeroengine maintenance workshop,an approximate mean value analysis method of the maintenance ability was proposed.The transferring model of aeroengine in the workshop was built by using extended stochastic Petri net,multi-level maintenance service performance indexes were revised by using single level performance indexes,squared variation coefficient method was used to approximate service time with normal distribution,and the evaluation results of the ability by using approximate mean value analysis method and simulation method were compared.The result indicates that the maximal relative error of queuing length for maintenance sections is 9.14%,part checking,handcrafted repairing and mechanical machining are the bottlenecks of the workshop performance,so the method is proved to be efficient.