Travel-time models for the rack with a continuous rectangular pick face in automated storage/retrieval systems

Abstract

This thesis studies travel-time models for automated storage /retrieval(AS/R) machines in the automated storage/retrieval systems. It is assumed that the automated S/R machine travels simultaneously in the horizontal and vertical directions as it moves along a storage aisle. For the case of class-based storage, class partitioning values are determined for both two class and three class storage assignment and expected travel times are calculated for both single and dual command cycles. Also, this study analyzes the effects of shape factors on the expected travel time. Additionally, for the model developed, an interactive computer program is made to find expected travel times and shape factors.