Journal
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
Volume 170, Issue 1, Pages 144-155Publisher
ELSEVIER
DOI: 10.1016/j.ejor.2004.07.057
Keywords
applied probability; miniload; order picking; class based storage; automated storage/retrieval systems
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To increase throughput, the higher turnover items are often stored near the input/output point of a miniload system. We analyze the performance of such a miniload with a square-in-time rack containing two storage zones: high turnover and low turnover. First, we derive the distribution of the dual command travel time. System performance measures such as the throughput depend upon the distribution of the dual command travel time and the distribution of pick times. We work out the details and obtain closed-form expressions for throughput for two important families of pick time distributions: deterministic and exponential. Finally, we investigate how the size of the high turnover region affects throughput. (c) 2004 Elsevier B.V. All rights reserved.
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