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In customary Automated Storage and Retrieval Systems (AS/RSs), stacker cranes (S/R machines) are used to store and retrieve loads into/from the storage cells. In this paper, the open-rack structure with unidirectional-upward mobile loads within the rack is applied in AS/RS, in which the stacker crane is only used for the retrieval operations, and the storage operations are carried out by separate devices namely, storage platforms. Heuristics algorithms and models are developed for load shuffling and travel time of the storage platform, respectively. Then the expected travel time of the proposed AS/RS is derived.
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