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Modelling and optimisation of single-cycle time for mobile rack AS/RS

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  • Latéfa Ghomri
  • Ali Rimouche

Abstract

This paper deals with mobile-rack automated storage/retrieval systems (AS/RS) that are a particular physical configuration of unit-deep AS/RS, i.e. the class of systems where each cell is designed to contain a single load. There are two main contributions in this paper: the first one is the analytical modelling of the average single-cycle time for mobile-rack AS/RS. The approach adopted for modelling is based on a continuous approximation, which is not recent, however, the approach proposed here for the transition from the discrete to the continuous models is different from those used previously in the literature. In a certain way, the multi-aisle and unit-load configurations can be seen as special cases of the mobile-rack configuration. This allows to deduce analytical models for the average single-cycle time for these two configurations from the one developed for mobile rack. The second main contribution of this paper is to find the dimensions of the AS/RS that minimise the average single-cycle time. The optimisation has been studied formally for the multi-aisle and unit-load configurations, and numerically for the mobile-rack configuration.

Suggested Citation

  • Latéfa Ghomri & Ali Rimouche, 2023. "Modelling and optimisation of single-cycle time for mobile rack AS/RS," International Journal of Production Research, Taylor & Francis Journals, vol. 61(22), pages 7685-7706, November.
    • Handle: RePEc:taf:tprsxx:v:61:y:2023:i:22:p:7685-7706
    DOI: 10.1080/00207543.2022.2161113
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