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Distance and Travel Time Modeling in High-Level Picker-To-Part Systems (3-D Warehouses)

This article describes new minimum travel time formulations for the picker routing problem (PRP) in 3-D warehouses based on real operating conditions, such as height reference levels, to leave aisles and to pick devices with simultaneous and sequential movements. This study validated the proposed formulations through an experimental design, statistical analysis based on ANOVA, and comparison of means. This research proposal allows for improving order picking models for 3-D warehouses by including appropriate travel time formulations related to vertical and horizontal movements and height reference levels to leave aisles, which affect the objective functions involving travel time.