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Chinese Journal of Management Science ›› 2020, Vol. 28 ›› Issue (10): 156-164.doi: 10.16381/j.cnki.issn1003-207x.2018.1466

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Joint Optimization of Order Sequence and Pick Position in an AS/RS with Multiple In-The-Aisle Pick Positions

HAN Dong-ya, CHEN Ran, YU Yu-gang, GUO Xiao-long   

  1. School of Management, University of Science and Technology of China, Hefei 230026, China
  • Received:2018-10-14 Revised:2019-06-03 Online:2020-10-20 Published:2020-11-11

Abstract: The automated storage and retrieval system with multiple in-the-aisle pick positions (ASRS-MIAPP) is a new type of warehousing technology which combines storage and order picking process. The typical feature is that there exists multiple picking locations at the bottom of the rack for workers. The sequence of storage and retrieval jobs as well as the assignment between the picking locations and retrieval jobs are studied to minimize total travel distance of a storage/retrieval (S/R) machine in an ASRS-MIAPP. A mixed integer programming model is proposed, and a two-stage heuristic algorithm is designed to solve this problem. In the first stage, the sequence of storage and retrieval jobs is selected which is handed over to the second stage where the one-to-one assignment of the picking locations for the given retrieval jobs is determined. The computational experiments show the effectiveness of the proposed algorithm. Compared to first-come-first-served algorithms, commonly used in the practice, the total travel distance reduces on average by 20%.

Key words: automated storage and retrieval system, multiple picking location, sequencing, mixed-integer optimization

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