横向补给策略下不完全修复件的可用度评估方法

Evaluation of availability for partial repairable spares with lateral transshipment

针对任务期内普遍存在的故障件报废问题,首先通过忽略维修、运输时间将多级不完全修复件近似等效为底层站点的单级消耗件;然后,通过分析各底层站点备件量的竞争问题将备件量的多级配备等效为底层站点的单级配备;最后,利用伽马分布的可加性得到部件的可用度模型。在算例中,将构造仿真模型与近似方法进行了对比,结果表明:横向补给策略能有效提高装备可用度;在现场备件配置充足或维修、运输时间较短时,该近似评估方法具有较高精度。

For the widely existed problem of rejection for spares during the mission, an approximate evaluation method of availability for system with transshipment is proposed. At first, multi-echelon partial-repairable spares are converted to bottom-echelon non-repairable ones by omitting repair and transportation time. Then, the number of spares equipped in multi-echelon are converted to ones e- quipped in bottom-echelon by analyzing the competition for spares among bottom-echelon sites. Final- ly, a computational model of availability is obtained based on the additive property of Gamma distri- bution. In actual example, a simulation model is built to verify the approximate method, and the re- sults show that transshipment can improve availability effectively, and the approximate method owns high precision when the values of repair and transportation time is not too big or the spares are adequate.