1 / 15

连续观测系统

Soup. Soup. Soup. IP. IP. IP. Order received. Order received. Order received. Order received. Q. Q. Q. On-hand inventory. OH. OH. OH. R. Order placed. Order placed. Order placed. Time. L. L. L. TBO. TBO. TBO. Figure 10.6. 连续观测系统. IP. IP. Order received.

leroy-wright
Download Presentation

连续观测系统

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Soup Soup Soup IP IP IP Order received Order received Order received Order received Q Q Q On-hand inventory OH OH OH R Order placed Order placed Order placed Time L L L TBO TBO TBO Figure 10.6 连续观测系统

  2. IP IP Order received Order received Order received Order received Q Q Q OH On-hand inventory R Order placed Order placed Order placed Time L1 L2 L3 TBO1 TBO2 TBO3 不确定需求

  3. 再订货点/ 安全库存 Average demand during lead time

  4. Cycle-service level = 85% Probability of stockout (1.0 – 0.85 = 0.15) Average demand during lead time R zL 再订货点/ 安全库存

  5. Cycle-service level = 85% Probability of stockout (1.0 – 0.85 = 0.15) Average demand during lead time R zL Safety Stock/R Safety stock = zsL = 2.33(22) = 51.3 = 51 boxes Reorder point = ADDLT + SS = 250 + 51 = 301 boxes 再订货点/ 安全库存

  6. st = 15 st = 15 st = 15 st = 26 + 75 Demand for week 1 + 225 Demand for three-week lead time 75 Demand for week 2 = 75 Demand for week 3 提前期分布

  7. T On-hand inventory Time P P 定期观测系统

  8. T Q1 On-hand inventory Order placed Time P P 定期观测系统

  9. T Q1 On-hand inventory Order placed L Time P P 定期观测系统

  10. T Order received Q1 On-hand inventory Order placed L Time P P 定期观测系统

  11. T Order received Order received Order received Q3 Q1 Q2 On-hand inventory Order placed Order placed L L L Time P P 定期观测系统

  12. T IP IP IP Order received Order received Order received Q3 Q1 OH OH Q2 IP1 IP3 IP2 On-hand inventory Order placed Order placed L L L Time P P Protection interval 定期观测系统

  13. T IP IP IP Order received Order received Order received Bird feeder—Calculating P and T Q3 Q1 OH OH Q2 IP1 IP3 IP2 On-hand inventory EOQ D 75 936 P = (52) = (52) = 4.2 or 4 weeks Order placed Order placed P+L = st P + L = 5 6 = 12 units L L L Time P P Protection interval 定期观测系统 t= 5 units L = 2 weeks cycle/service level = 90% EOQ = 75 units D = (18 units/week)(52 weeks) = 936 units T = Average demand during the protection interval + Safety stock = d (P + L) + zsP + L = (18 units/week)(6 weeks) + 1.28(12 units) = 123 units

  14. T IP IP IP Order received Order received Order received Bird feeder—Calculating P and T Q3 Q1 OH OH Q2 IP1 IP3 IP2 On-hand inventory 4(18) 2 936 4(18) C = ($15) + ($45) + 15($15) Order placed Order placed L L L Time P P Protection interval 定期观测系统 t= 5 units L = 2 weeks cycle/service level = 90% EOQ = 75 units D = (18 units/week)(52 weeks) = 936 units P = 4 weeks T = 123 units C = $540 + $585 + $225 = $1350

  15. P 系统 • 库存量补充定期进行，系统管理简单 • 从同一供应商订购多种物品，可以把订单合为一份采购单 • 只有在进行观测时，才需要了解库存状况 • 每种物品的观测频数可能各不相同，可减少总的订购及库存持有成本 • 订货批量固定，如果批量足够大，可能获得数量折扣 • 较低的安全库存量取得了节约的效果。 Q系统和P系统比较 Q 系统

More Related