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Travel time models for split-platform automated storage and retrieval systems

Author

Listed:
  • Tian Liu

    (Dongguan University of Technology)

  • Yeming Gong

    (EM - EMLyon Business School)

  • René de Koster

    (Erasmus University Rotterdam)

Abstract

In traditional automated storage and retrieval (AS/R) systems, the storage and retrieval machine travels simultaneously in the horizontal and vertical directions. The so-called split-platform AS/R (or SP-AS/R) system consists of platforms (or shuttles and lifts) that can move independently in horizontal (shuttles) and vertical (lifts) directions. This paper studies two dual command travel time models for such systems. We formulate a continuous travel time model for an SP-AS/R system with a dedicated lift per rack and another travel time model for an SP-AS/R system with a dedicated lift per job type. Then we analyse the performance of these two models. The two models are validated by computer simulation and give quite accurate results. We show that the optimal cycle time gap with the upper bound derived by an existing literature can be as large as 26%. We find interesting management insights for system implementation: when the shape factor of the rack is approximately less than 1, the policy using a dedicated lift per rack is better; when the shape factor of the rack is approximately more than 1, the policy using a dedicated lift per job type outperforms.

Suggested Citation

  • Tian Liu & Yeming Gong & René de Koster, 2018. "Travel time models for split-platform automated storage and retrieval systems," Post-Print hal-02312108, HAL.
    • Handle: RePEc:hal:journl:hal-02312108
    DOI: 10.1016/j.ijpe.2017.12.021
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    Cited by:

    1. 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).

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