Performance of miniload systems with two-class storage |
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Institution: | 1. Finnish Centre of Excellence in Generic Intelligent Machines Research, Aalto University, P.O. Box 15500, Aalto 00076, Finland;2. Department of Management of Technology and Innovation, Rotterdam School of Management, Erasmus University, P.O. Box 1738, Rotterdam 3000 DR, The Netherlands;1. College of Business Administration, Hongik University, Seoul 04066, South Korea;2. Department of Industrial Engineering, Hanyang University, Seoul 04763, South Korea |
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Abstract: | 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. |
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