Optimal travel time models for split-platform automated storage and retrieval systems

Y (Yeming) Gong, T Liu, Rene de Koster

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)
20 Downloads (Pure)

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 system consists of platforms (or shuttles and lifts), that can move independently in horizontal (shuttles) and vertical (lifts) directions. Previous literature on such systems is limited to single command cycles (i.e. storages or retrievals). This paper studies two optimal dual command travel time models. We formulate a continuous optimal travel time model for a split-platform AS/R system with a dedicated lift per rack and another travel time model for a split-platform 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 appear to give quite accurate results. We show that the optimal travel time gap with an upper bound from existing literature can be as large as 26%. When the shape factor of the rack is less than about 1, the policy to use a dedicated lift per rack is better; when the shape factor of the rack is more than about 1, the policy to use a dedicated lift per job type is better.
Original languageEnglish
Pages (from-to)197-214
Number of pages18
JournalInternational Journal of Production Economics
Volume197
DOIs
Publication statusPublished - 2018

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