Production Planning Control Operations Scheduling Dr.Na genG Prof.Zhibin JIANG Department of Industrial Engineering Management Shanghai Jiao Tong University
Production Planning & Control Dr. Na GENG Prof. Zhibin JIANG Department of Industrial Engineering & Management Shanghai Jiao Tong University Operations Scheduling
Operations Scheduling Contents ·Introduction Job Shop Scheduling Terminology ·Sequencing Rules Sequencing Theory for a Single Machine Sequencing Theory for Multiple Machines .Assembly Line Balancing Advanced Topics for Operations scheduling 国上泽充鱼大皇
Operations Scheduling Contents • Introduction • Job Shop Scheduling Terminology • Sequencing Rules • Sequencing Theory for a Single Machine • Sequencing Theory for Multiple Machines • Assembly Line Balancing • Advanced Topics for Operations scheduling
Introduction-What is Operations Scheduling Forecast of future demand Implement the production orders generated in MRP under given objectives Aggregate plan Allocate production resources (machine,workers et al.)to production orders (jobs or tasks Master production schedule(MPS) and their due dates)in an Schedule of production quantities by optimized manners; product and time period The results are time allocations of production resources to different Material Requirement Planning(MRP) jobs (job sequences on each Generate production orders and production resources); purchase order All the orders can be completed while all production resources are Operations Scheduling utilized with their loads being To meet quantities and time balanced. requirements for MRP @上浒充鱼大睾
Introduction-What is Operations Scheduling ? • Implement the production orders generated in MRP under given objectives ; • Allocate production resources (machine, workers et al.) to production orders (jobs or tasks and their due dates) in an optimized manners; • The results are time allocations of production resources to different jobs (job sequences on each production resources); • All the orders can be completed while all production resources are utilized with their loads being balanced. Forecast of future demand Aggregate plan Master production schedule (MPS) Schedule of production quantities by product and time period Material Requirement Planning (MRP ) Generate production orders and purchase order Operations Scheduling To meet quantities and time requirements for MRP
Introduction-Optimal schedule rules Significant issues for determining optimal or approximately optimal scheduling rules are the following. 1)The job arrival pattern 2)Number and variety of machine in the shop 3)Number of workers in the shop. 4)Particular flow patterns. 5)Evaluation of alternative rules. 国上泽道多
Introduction- Optimal schedule rules • Significant issues for determining optimal or approximately optimal scheduling rules are the following. 1) The job arrival pattern 2) Number and variety of machine in the shop. 3) Number of workers in the shop. 4) Particular flow patterns. 5) Evaluation of alternative rules
Introduction-Objectives of Job Shop Scheduling Objectives of operations scheduling 1)Meet due date; 2)Minimize WIP inventory; 3)Minimize the average flow time through the systems; 4)Provide for high machine/worker(time)utilization (minimize idle time); 5)Provide for accurate job status information; 6)Reduce setup cost; 7)Minimize production and worker costs Proper trade off between cost and quality is one of the most challenging strategic issues facing a firm today. 国上泽充鱼率
Introduction-Objectives of Job Shop Scheduling • Objectives of operations scheduling 1) Meet due date; 2) Minimize WIP inventory; 3) Minimize the average flow time through the systems; 4) Provide for high machine/worker (time) utilization (minimize idle time); 5) Provide for accurate job status information; 6) Reduce setup cost; 7) Minimize production and worker costs Proper trade off between cost and quality is one of the most challenging strategic issues facing a firm today