供應鏈管理環(huán)境下的生產計劃(存儲版)
【正文】 640Wt +300Ht +500Lt + 6Ot + 2It + 5St + 30Ct + 10Pt }(3) 約束條件 – 1? 每月庫存平衡限制 ( Node balancing for product flow, Inflow = Outflow. )It1+ Pt +Ct =Dt + St1+ It StFor t=1, 2, …,6With I0=1000, S0=0, S6=0, I6 ?500 (3) 約束條件 – 2? 員工數(shù)量、雇傭員工人數(shù)和解雇員工人數(shù)之間的限制條件( Node balancing for workforce flow work, Inflow = Outflow. )Wt = Wt1 + Ht – Lt For t=1, 2, …,6With W0 = 80 (3) 約束條件 – 3? 生產能力的限制條件(20 working days in each month and 8 hours per day)Pt ? 40Wt + Ot/4 for t=1, 2, …, 6(3) 約束條件 –4? 加班時間限制條件Ot ? 10Wt for t=1, 2, …,6MIN TC =?t=16 {640Wt +300Ht +500Lt + 6Ot + 2It + 5St + 30Ct + 10Pt }It1 + Pt + Ct = Dt + St1 + It StWith I0=1000, S0=0, S6=0 I6 ?500, W0 = 80 Wt = Wt1 + Ht – Lt Pt ? 40Wt + Ot/4 for t=1, 2, …, 6Ot ? 10Wt for t=1, 2, …,6Period Hired Ht LayoffLtWorkforce W tOvertime OtInventory ItStockout StSubcontract CtTotal Prod Pt0 0 0 80 0 1000 0 01 0 15 65 0 1983 0 0 25832 0 0 65 0 1567 0 0 25833 0 0 65 0 950 0 0 25834 0 0 65 0 0 267 0 25835 0 0 65 0 117 0 0 25836 0 0 65 0 500 0 0 2583The total cost of is $422275 如果我們假定 t期的平均庫存量為最初和最終庫存的平均值，即 (It1+It)/2，則 計劃期內的平均庫存 ：Little’s law : 平均周轉時間平均周轉時間 =平均庫存平均庫存 /生產能力生產能力故，計劃期內的平均季節(jié)性庫存 =895故，計劃期內的平均周轉時間 = 月靈敏度分析? 增加需求波動 (，總需求 16000個單位 )? 增加庫存成本 (從 $2 增加到 $6)? 加班成本降到 $ /小時? ……Period Hired Layoff Workforce Overtime Inventory Stockout Subcontract Total Prod. 0 0 0 80 0 1000 0 0 1 0 15 65 0 2583 0 0 2583 2 0 0 65 0 2167 0 0 2583 3 0 0 65 0 950 0 0 2583 4 0 0 65 0 0 1267 0 2583 5 0 0 65 0 90 683 0 2583 6 0 0 65 0 500 0 0 2583The total cost of meeting the new demand pattern is $432858 Results: the seasonal fluctuation of demand leads to an increase in either Inventory or backlogs as well as an increase in the total cost of SC. Synchronization of supply and demand bees more difficult. Increased demand fluctuationIncrease in holding cost (from $2 to $6, Refer
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