串件拼修策略下指数型不完全修复件的可用度评估

串件拼修能有效提高装备保障效能.针对任务期内普遍存在的故障件报废问题,提出了串件拼修策略下的系统可用度近似评估方法.以两层级部件为例,通过忽略维修时间将底层不完全修复件近似等效为消耗件,并分别以上层部件完全可修和部分可修展开,利用等效思想将上层备件数量折算为底层备件数量,最后通过建立可用度与可靠度的关系得到系统可用度表达式.算例中通过构造仿真模型与近似方法进行对比,结果表明:本文近似方法在高可用度范围内具有较高的精度,在串件拼修策略下使装备可用度提高了4.23%.

Evaluation of availability for partial repairable exponential spares with cannibalization

Cannibalization is an effective approach to improve support effectiveness. For the widely exited problem of rejection for spares during the mission, an approximate evaluation method of availability for system with cannibalization is proposed. Take two-indenture parts for example, partial-repairable spares in bottom-indenture are converted to non-repairable spares by omitting repair time, then the completely repairable and partial repairable top-indenture spares are considered respectively, top-indenture spares are converted to bottom-indenture ones by equivalent theory, at last system availability is got by building the relations between reliability and availability. In actual example, simulation model is built to verify the approximate method, the results show that the approximate method owns high precision in high availability range, and makes the availability of equipment increased by 4.23% with cannibalization.