An analysis of operating policies for multi-product unit load AS/RS

An analysis of operating policies for multi-product unit load AS/RS

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Article ID: iaor1991188
Country: South Korea
Volume: 15
Issue: 1
Start Page Number: 1
End Page Number: 15
Publication Date: Jun 1989
Journal: Journal of the Korean Institute of Industrial Engineers
Authors:
Keywords: queues: theory, simulation
Abstract:

In the past few years, increasing numbers of automatic storage/retrieval system (AS/RS) using computer controlled storage/retrieval machine have been installed. This paper introduces two modeling approaches to determine the best operating policy for AS/RS: an M/G/1 queueing model and a computer simulation model. The operation policy consists of three elements: the operation command cycle, the storage location method, and the operation dispatching rule. The analysis based on M/G/1 model is suitable for a quick and approximate evaluation, due to its inherent strict assumptions. The computer simulation can be used to perform a more realistic analysis. It is shown through the study that a significant improvement in the throughput and/or the space requirement can be expected by determining the best operating policy to a particular system. Most important, the computer simulation demonstrates its powerful capability in evaluating dynamic stochastic systems with imperfect information. [In Korean.]

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