Cycle time calculation of shuttle-lift-crane automated storage and retrieval system

Francesco Zammori, Mattia Neroni and Davide Mezzogori

IISE Transactions, 2021, vol. 54, issue 1, 40-59

Abstract: This article deals with cycle time calculation of Automated Storage and Retrieval Systems (AS/RS). Cycle time has a high impact on the operating performance of an AS/RS, and its knowledge is essential, both at the operational and design level. The novelty of this work concerns the peculiar kind of system that is considered, as the focus is on the Shuttle-Lift-Crane AS/RS. This solution, common in the steel sector, is used to store bundles of long metal bars, which are automatically handled by cranes, lifts, and shuttles. The functioning of these machines, which can operate in parallel and independently, is stochastically modeled, and the probability distribution function of the cycle time is computed, both for single and dual command cycles. The model, assessed via discrete event simulation, ensures a high average accuracy of 96% and 98%, under single and dual command cycles, respectively.

Date: 2021
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DOI: 10.1080/24725854.2020.1861391

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