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2006

A new ILP-based refinement heuristic for Vehicle Routing Problems

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A new ILP-based refinement heuristic for Vehicle Routing Problems
In the paper we address the Distance-Constrained Capacitated Vehicle Routing Problem (DCVRP), where k minimum-cost routes through a central depot have to be constructed so as to cover all customers while satisfying, for each route, both a capacity and a total-distance-travelled limit. Our starting point is the following refinement procedure proposed in 1981 by Sarvanov and Doroshko for the pure Travelling Salesman Problem (TSP): given a starting tour, (a) remove all the nodes in even position, thus leaving an equal number of "empty holes" in the tour; (b) optimally re-assign the removed nodes to the empty holes through the efficient solution of a min-sum assignment (weighted bipartite matching) problem. We first extend the SarvanovDoroshko method to DCVRP, and then generalize it. Our generalization involves a procedure to generate a large number of new sequences through the extracted nodes, as well as a more sophisticated ILP model for the reallocation of some of these sequen...
Roberto De Franceschi, Matteo Fischetti, Paolo Tot
Added 14 Dec 2010
Updated 14 Dec 2010
Type Journal
Year 2006
Where MP
Authors Roberto De Franceschi, Matteo Fischetti, Paolo Toth
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