Dynamic Lot Sizing and Scheduling for Steel-making Processes

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  • 動的ロットサイズスケジューリング手法の鉄鋼プロセスへの応用
  • ドウテキ ロットサイズスケジューリング シュホウ ノ テッコウ プロセス エ ノ オウヨウ

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Abstract

<p>The steel-making process requires a multi-stage production system that processes multiple items. Efficient production during the steel-making process is difficult to achieve because of the vast number of items, complex constraints and various changes in production requirements. This paper proposes a new method for maintaining high production efficiency by using prediction information to prevent large-scale production systems from experiencing process overload and full stockyards. First, the production system is modeled into a dynamic optimization problem capable of expressing complex steel-making process lot production constraints with some simplification. After that, the problem is solved using a new two-step algorithm. The first step decides appropriate lot size dynamically based on a Lagrangian decomposition coordination method, and the next step makes an optimal schedule that satisfies the constraints. We verify the performance of the proposed method by applying it to actual production data.</p>

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