Two Stage Lot Scheduling Algorithm : A Study on Production Ordering System in Lot Production System

Abstract

This paper shows the two-stage lot scheduling algorithm for multi-lot production process. The algorithm consists of the first stage selecting between three scheduling methods and the second stage executing the method selected in the first stage. Then, this algorithm proposes two new control means for decreasing the gap between the evaluation function values of the first 'plan' stage and the second 'execution' stage. One is a feedback control, which uses the information obtained by executing the already planned scheduling method for the lower production process in the plan for the upper production process that follows. The other is a feed-forward control, which uses the estimated information about all upper production processes obtained by applying each of the three scheduling methods to every production process.