造船所鋼板ストックヤードにおける仕分け作業の効率化

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In this paper we analyze logistics in a ship-building stockyard, and develop a sorting method in the stockyard. In such stockyards, the steel plates are piled up on the yard, and the plates must be moved from the top of the pile one by one. Therefore, we must turn over many plates to pick up objective plates for the sorting. Decreasing the working time of turning over the plates greatly contributes to improve the working efficiency on the ship-building. In this paper, the logistics in the ship-building yard has two stockyards: One is for sorting by cutting date, and the other is for sorting subblocks to assemble. The former stockyard has enough space for the sorting, but there is no time to turn over the plates. The other hand, the later has insufficient space, and the plates must be turned over for the sorting. In this paper we investigate to take advantage of the enough space of the former stockyard. We introduce a new cost function that would reflect the working time of turning over the plates. The cost is simply defined by sum of the block-length in the sequence of the plates arriving at (or leaving) the stockyard, and it is independent of the stockyard capacity. We show analysis of the block-length and the cost function. We propose a new approach to decrease the cost function making use of the space of the former stockyard. It is to divide plates to several block-groups so that the numbers of the plates are the same. We apply our approach to a real ship-building stockyard. The simulation results show that it can save the costs about 40%.
社団法人日本船舶海洋工学会の論文
2005-03-20

造船所鋼板ストックヤードにおける仕分け作業の効率化

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