Abstract
In a warehouse that uses dual-command operations, workers travel loaded from the pickup and deposit (P&D) point first to a location to store a pallet, then to a second location from which they pick a pallet and return to the P&D point. We develop expected travel distance expressions for such operations and use them to analyze three common warehouse designs. Our results indicate that the best of the three is – in our experience – the one least commonly found in practice. We also show that the optimal placement of a “middle cross aisle” in the most common design is, in fact, not in the middle.
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