Placement of warehouse cross-aisles
Berglund, Paul G.
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Given a picker-to-part warehouse having a simple rectilinear aisle arrangement with north-south storage aisles and east-west travel aisles (or "cross aisles"), this paper investigates the optimal placement of the cross aisles as a consequence of the probability mass function of the order pick points, as determined by the storage policy. That is, what placement of the cross aisles will result in a minimal expected path length for the picker? An analytical solution procedure is developed for the optimal placement of a single middle cross aisle for a given storage policy. A simplifying assumption is made as regards picker routing, but arbitrary non-random storage policies are considered. The solution procedure is generalized to a method for multiple cross aisles. Some example problems are solved and a simulation study is used to measure the impact of our simplifying assumptions.