Abstract

Steel plate yard in shipbuilding, followed by the Separated-Strategy, is divided into Temporary-Area, Storage-Area, and Delivery-Area. When a target plate is not at the top of the stack, we must relocate the plates on it, which is called Plate-Shift. This paper develops a bilevel combinatorial optimization model and a multi-stage decision-making process of the delivery operation, and applies a greedy algorithm combined with a genetic algorithm to optimize the total amount of shifting. Compared with the current schedule based on a series of production rules, this method can get a better solution with less computing time and shifts.

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