安全库存策略

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1、inventoryTimeUnfixedOrderperiodQ1HowtocalculateSSQ2Q3SafetystockLLLHowtocalculateSSuSSSS=Z*σDemandandsupplyvariance95%5%Iftheservicelevelis95%,Z=1.645HowtocalculateSSReleaseorderETACIQreleaseproductionSSLeadtimeCustom&CIQVariance(Leadtime,custom&CIQ,Demand)supplyN(μσ22)DemandN(μσ12)

2、supplyAggregatevariancePoolingLeadtimeVarianceVarianceN(u,σ)Demand~N(28,σ1)Custom&CIQ~N(28,σ2)Supply~N(LT,σ3)HowtocalculateSSSfatystockWeekscover&MOQTimeSSAverageinventoryMOQInventoryIdealAverageinventory=SS+MOQ/2Weekscover&OrderperiodTimeSSAverageinventoryMOQInventoryTimeSSAveragei

3、nventoryMOQInventoryAverageinventory’’Orderperiod=1Orderperiod=K(K>1)WriteoffriskNormalcoverdaysWriteoffriskETAOutofshelflife~N(normalcoverdays,δ’)