Variance-based approximations of transaction waiting times in autonomous vehicle storage and retrieval systems Online publication date: Mon, 02-Mar-2009
by Li Zhang, Ananth Krishnamurthy, Charles J. Malmborg, Sunderesh S. Heragu
European J. of Industrial Engineering (EJIE), Vol. 3, No. 2, 2009
Abstract: Approximation strategies for transaction waiting times are proposed for use in Autonomous Vehicle Storage and Retrieval Systems (AVS/RSs) with non-Poisson arrival rates and non-exponential service times. The proposed modelling tools dynamically adjust approximations based on the variance of the transaction inter-arrival times observed in a system. Simulation-based validation studies indicate that this strategy can reduce the magnitude of errors in estimated transaction waiting times by approximately 80% relative to static approximations. The design conceptualisation applications of the proposed technique are demonstrated over a series of realistically sized demonstration problems. [Received 8 April 2008; Revised 20 July 2008; Accepted 2 August 2008]
Online publication date: Mon, 02-Mar-2009
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