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A generalised sequencing problem for unit-load automated storage and retrieval systems

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  • Eunyong Chung
  • H. Felix Lee

Abstract

With continuing need for high throughput Automated Storage and Retrieval Systems (AS/RS), many researchers have studied a problem of sequencing storage and retrieval requests processed by the storage/retrieval machine to maximise the system throughput. These studies assume that each retrieval request is fixed with a pre-determined bin position in the AS/RS rack. However, in reality, a retrieval request is associated with a specific product item which is available in multiple bin locations. In this paper, we address a generalised sequencing problem that determines both specific bin locations for the retrieval requests and sequencing with the chosen bin locations. To solve this new complex combinatorial problem, we introduce heuristic methods and present their computational results. We also present the analytical cycle time distribution and mean value for the single command when an item of a retrieval request is available in multiple bin locations.

Suggested Citation

  • Eunyong Chung & H. Felix Lee, 2007. "A generalised sequencing problem for unit-load automated storage and retrieval systems," International Journal of Industrial and Systems Engineering, Inderscience Enterprises Ltd, vol. 2(4), pages 393-412.
    • Handle: RePEc:ids:ijisen:v:2:y:2007:i:4:p:393-412
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