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Order batching using an approximation for the distance travelled by pickers. (English) Zbl 1441.90015
Summary: In this paper we investigate the problem of order batching for picker routing. Our approach is applicable to warehouses (storage areas) arranged in the standard rectangular grid layout, so with parallel aisles and two or more cross-aisles. The motivation underlying our work is online grocery shopping in which orders may be composed of dozens of items. The approach presented directly addresses order batching, but uses a distance approximation to influence the batching of orders without directly addressing the routing problem.
We present a basic formulation based on deciding the orders to be batched together so as to optimise an objective that approximates the picker routing distance travelled. We extend our formulation by improving the approximation for cases where we have more than one block in the warehouse. We present constraints to remove symmetry in order to lessen the computational effort required, as well as constraints that significantly improve the value of the linear programming relaxation of our formulation. A heuristic algorithm based on partial integer optimisation of our mathematical formulation is also presented. Once order batching has been decided we optimally route each individual picker using a previous approach presented in the literature.
Extensive computational results for publicly available test problems involving up to 75 orders are given for both single and multiple block warehouse configurations.
##### MSC:
 90B06 Transportation, logistics and supply chain management 90C10 Integer programming 90C59 Approximation methods and heuristics in mathematical programming
##### Software:
Algorithm 97; CPLEX; MySQL
Full Text:
##### References:
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