A Gemoetrical Approach to Computing Expected Cycle Times for Class-Based Storage Layouts in AS/RS

J. Ashayeri, R.M.J. Heuts, M.W.T. Valkenburg, H. Veraart, M.R. Wilhelm

Research output: Working paperDiscussion paperOther research output

Abstract

An exact, geometry-based analytical model is presented that can be used to compute the expected cycle time for a storage/retrieval (S/R) machine, executing single-commands, dual-commands, or both, in a rack structure that has been laid out in pre-specified storage zones for classes of goods.The rack may be either square-in-time or non-square-in-time.The approach is intuitively appealing, and it does not assume any certain layout shape, such as traditional "L-shaped" class layouts.The model has been coded in Turbo Pascal, and can be used by designers as a tool for quickly evaluating alternative layout configurations with respect to expected S/R cycle time in an AS/RS, and thereby the throughput of an automated warehouse over time.This model has been successfully applied in a major manufacturing plant in Europe to evaluate reconfigurations of their rack storage layouts over the past five years.
Original languageEnglish
Place of PublicationTilburg
PublisherOperations research
Number of pages32
Volume2001-57
Publication statusPublished - 2001

Publication series

NameCentER Discussion Paper
Volume2001-57

Keywords

  • Automated storage and retrieval systems
  • AS/RS
  • class-based storage.

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