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A bi-directional flow-rack automated storage and retrieval system for unit-load warehouses

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  • Zhuxi Chen
  • Xiaoping Li
  • Jatinder N.D. Gupta

Abstract

Flow-rack is a multi-deep rack containing multi-row and multi-column slope bins. Traditionally, bins slope in the same direction in a flow-rack to make unit-loads slide from the storage face to the retrieval face driven by gravity, which cause unit-loads are stored to the storage face and retrieved from the retrieval face. In this paper, a bi-directional flow-rack (BFR) is designed, in which bins in adjacent columns slope to opposite directions. In each side of a BFR, unit-loads are stored in half of the bins and retrieved from the other half. Therefore, dual-command (DC) operations could be simultaneously performed on both faces and blocking unit-loads are re-stored to available bins on the same face directly. We develop a travel time model for BFR systems, which provides the throughput baseline for different configurations of BFR. A DC operation generation method is introduced for BFR systems. Simulation experiments are conducted to evaluate the effectiveness of the BFR travel time model, to compare the throughput performance between BFR and SFR systems and to evaluate the performance of the proposed DC operation generation method.

Suggested Citation

  • Zhuxi Chen & Xiaoping Li & Jatinder N.D. Gupta, 2015. "A bi-directional flow-rack automated storage and retrieval system for unit-load warehouses," International Journal of Production Research, Taylor & Francis Journals, vol. 53(14), pages 4176-4188, July.
    • Handle: RePEc:taf:tprsxx:v:53:y:2015:i:14:p:4176-4188
    DOI: 10.1080/00207543.2014.980459
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    Cited by:

    1. Nils Boysen & David Boywitz & Felix Weidinger, 2018. "Deep-lane storage of time-critical items: one-sided versus two-sided access," OR Spectrum: Quantitative Approaches in Management, Springer;Gesellschaft für Operations Research e.V., vol. 40(4), pages 1141-1170, October.
    2. Hamzaoui, Mohammed A. & Arbaoui, Taha & Yalaoui, Farouk & Sari, Zaki, 2021. "An exact optimization method based on dominance properties for the design of AS/RSs," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 146(C).
    3. Yang, Peng & Yang, Kaidong & Qi, Mingyao & Miao, Lixin & Ye, Bin, 2017. "Designing the optimal multi-deep AS/RS storage rack under full turnover-based storage policy based on non-approximate speed model of S/R machine," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 104(C), pages 113-130.

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