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A unified exact method for solving different classes of vehicle routing problems

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Abstract

This paper presents a unified exact method for solving an extended model of the well-known Capacitated Vehicle Routing Problem (CVRP), called the Heterogenous Vehicle Routing Problem (HVRP), where a mixed fleet of vehicles having different capacities, routing and fixed costs is used to supply a set of customers. The HVRP model considered in this paper contains as special cases: the Single Depot CVRP, all variants of the HVRP presented in the literature, the Site-Dependent Vehicle Routing Problem (SDVRP) and the Multi-Depot Vehicle Routing Problem (MDVRP). This paper presents an exact algorithm for the HVRP based on the set partitioning formulation. The exact algorithm uses three types of bounding procedures based on the LP-relaxation and on the Lagrangean relaxation of the mathematical formulation. The bounding procedures allow to reduce the number of variables of the formulation so that the resulting problem can be solved by an integer linear programming solver. Extensive computational results over the main instances from the literature of the different variants of HVRPs, SDVRP and MDVRP show that the proposed lower bound is superior to the ones presented in the literature and that the exact algorithm can solve, for the first time ever, several test instances of all problem types considered.

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Authors and Affiliations

  1. DEIS, University of Bologna, Via Venezia 52, 47023, Cesena, Italy

    Roberto Baldacci

  2. Department of Mathematics, University of Bologna, Via Sacchi 3, 47023, Cesena, Italy

    Aristide Mingozzi

Authors
  1. Roberto Baldacci
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  2. Aristide Mingozzi
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Correspondence to Roberto Baldacci.

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Baldacci, R., Mingozzi, A. A unified exact method for solving different classes of vehicle routing problems. Math. Program. 120, 347–380 (2009). https://doi.org/10.1007/s10107-008-0218-9

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  • DOI: https://doi.org/10.1007/s10107-008-0218-9

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