Production and Operation Managements Chapter 3 Aggregate Planning Dr Na genG Department of Industrial Engineering Management Shanghai Jiao Tong University
Production and Operation Managements Dr Na GENG Department of Industrial Engineering & Management Shanghai Jiao Tong University Chapter 3 Aggregate Planning
图 Chapter 3 Aggregate Planning Contents .Introduction Aggregate Units of Production; .Costs in Aggregate Planning; .A Prototype Problem; .Solution of Aggregate Planning Problem by LP
Chapter 3 Aggregate Planning Contents •Introduction •Aggregate Units of Production; •Costs in Aggregate Planning; •A Prototype Problem; •Solution of Aggregate Planning Problem by LP
A Prototype Problem Example 3.2 Densepack is to plan workforce and production level for six-month period Jan.to June.The firm produces a line of disk drives for mainframe computers.Forecast demand over the next six months for a particular line of drives in a plant are 1,280,640,900,1,200,2,000 and 1,400.There are currently (end of Dec.)300 workers employed in the plant.Ending inventory in Dec.is expected to be 500 units,and the firm would like to have 600 units on hand at the end of June
A Prototype Problem Example 3.2 Densepack is to plan workforce and production level for six-month period Jan. to June. The firm produces a line of disk drives for mainframe computers. Forecast demand over the next six months for a particular line of drives in a plant are 1,280, 640, 900, 1,200, 2,000 and 1,400. There are currently (end of Dec.) 300 workers employed in the plant. Ending inventory in Dec. is expected to be 500 units, and the firm would like to have 600 units on hand at the end of June
A Prototype Problem Month Predicated Net Net Cumulative Demand Predicated Demand Demand Jan. 1,280 780(1280-500) 780 Feb. 640 640 1,420 March 900 900 2,320 April 1,200 1,200 3,520 May 2,000 2,000 5,520 June 1,400 2,000(1400+600) 7,520
A Prototype Problem Month Predicated Demand Net Predicated Demand Net Cumulative Demand Jan. 1,280 780(1280-500 ) 780 Feb. 640 640 1,420 March 900 900 2,320 April 1,200 1,200 3,520 May 2,000 2,000 5,520 June 1,400 2,000(1400+600 ) 7,520
A Prototype Problem If the shortage is not permitted,the cumulative production must be at least as great as cumulative net demand each period-Feasible AP 8 AP:Any curve above the accumulated net demand Feasible 5 production schedule Cumulative net 3 demand 2 Inventory 0 3 4 5 6 Month Fig.3-4 A Feasible Aggregate Plan for Densepack
A Prototype Problem If the shortage is not permitted, the cumulative production must be at least as great as cumulative net demand each period-Feasible AP Fig. 3-4 A Feasible Aggregate Plan for Densepack AP: Any curve above the accumulated net demand