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<p>As a new kind of shuttle-based storage and retrieval system (SBS/RS), the four-way shuttle-based storage and retrieval system (FSS/RS) has been widely used in various industries due to its higher space utilization, higher throughput capacity, and greater flexibility. This paper proposes three different partitioning storage strategies to improve the operation efficiency of the FSS/RS: horizontal partitioning, vertical partitioning, and horizontal &amp;vertical partitioning. Firstly, the layout of the system and the workflow are described, and the operational task times of the shuttles and lifts are analyzed for these three different categorical storage strategies and unpartitioned, respectively. Then, a semi-open-loop queuing network performance evaluation model of the FSS/RS was established, and a solution algorithm was designed. Finally, the following conclusions are drawn from the sensitivity analysis: firstly, under the condition of the same number of tiers, columns, aisles, and storage spaces, the higher the proportion of zone A (with a high turnover rate), the smaller the benefit of adopting a partitioned storage strategy. Conversely, the smaller the proportion of zone A, the greater the performance improvement; under such conditions, the horizontal &amp; vertical partitioning strategy proves to be the most effective. Secondly, when the turnover rate of zone A is high (approximately above 75%), the horizontal &amp; vertical partitioning strategy outperforms the other strategies and the non-partitioned case. When the turnover rate of zone A is low (approximately below 40%), the horizontal partitioning strategy yields the best system performance.</p>

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Class-based storage strategies for a four-way shuttle-based storage and retrieval system using turnover rate

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Dong Yang,
  • Chunze Fu,
  • Zhaopan Sang

摘要

As a new kind of shuttle-based storage and retrieval system (SBS/RS), the four-way shuttle-based storage and retrieval system (FSS/RS) has been widely used in various industries due to its higher space utilization, higher throughput capacity, and greater flexibility. This paper proposes three different partitioning storage strategies to improve the operation efficiency of the FSS/RS: horizontal partitioning, vertical partitioning, and horizontal &vertical partitioning. Firstly, the layout of the system and the workflow are described, and the operational task times of the shuttles and lifts are analyzed for these three different categorical storage strategies and unpartitioned, respectively. Then, a semi-open-loop queuing network performance evaluation model of the FSS/RS was established, and a solution algorithm was designed. Finally, the following conclusions are drawn from the sensitivity analysis: firstly, under the condition of the same number of tiers, columns, aisles, and storage spaces, the higher the proportion of zone A (with a high turnover rate), the smaller the benefit of adopting a partitioned storage strategy. Conversely, the smaller the proportion of zone A, the greater the performance improvement; under such conditions, the horizontal & vertical partitioning strategy proves to be the most effective. Secondly, when the turnover rate of zone A is high (approximately above 75%), the horizontal & vertical partitioning strategy outperforms the other strategies and the non-partitioned case. When the turnover rate of zone A is low (approximately below 40%), the horizontal partitioning strategy yields the best system performance.