任务期内多层级不完全修复件的可用度评估

摘要

保障效能评估是合理制定备件方案的基础。针对任务期内有限维修能力下的单级保障效能评估问题，提出一种多层级不完全修复件的可用度近似评估方法。首先通过忽略维修时间，将系统中的不完全修复件近似等效为消耗件；然后通过模拟维修换件过程，把所有非顶层备件配置数量全部折算为顶层部件备件数量；针对顶层部件利用伽马分布的可加性，最终得到备件方案下的可用度计算模型；通过实例与仿真表明，所提近似方法能在维修时间较短或备件较充足的情况下，对可用度实现较高精度的评估，基本满足任务期内的高保障度要求。%Evaluation of support effectiveness is the base for formulating the plan of spare parts.For the e-valuation of support effectiveness under limited maintenance capability during the mission,an approximate eval-uation method of availability for multi-indenture partial repairable spares is proposed.At first,partial repairable spares are converted to non-repairable spares by omitting repair time.Then all the non-top-indenture spares are converted to top-indenture ones by simulating the entire process of maintenance and replacement.Finally,the computational model of availability is obtained based on the additive property of gamma distribution.In an actual example compared with simulation results,the approximate algorithm owns high precision when the values of repair time is not too big or the spares are adequate,which can meet high availability demands during the mission.