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**A genetic and set partitioning two-phase approach for the vehicle routing problem with time windows.**
*(English)*
Zbl 1163.90357

Summary: The Vehicle Routing Problem with Time Windows (VRPTW) is a well-known and complex combinatorial problem, which has received considerable attention in recent years. This problem has been addressed using many different techniques including both exact and heuristic methods. The VRPTW benchmark problems of M. M. Solomon [Oper. Res. 35, 254–262 (1987; Zbl 0625.90047)] have been most commonly chosen to evaluate and compare all algorithms. Results from exact methods have been improved considerably because of parallel implementations and modern branch-and-cut techniques. However, 24 out of the 56 high order instances from Solomon’s original test set still remain unsolved. Additionally, in many cases a prohibitive time is needed to find the exact solution. Many of the heuristic methods developed have proved to be efficient in identifying good solutions in reasonable amounts of time. Unfortunately, whilst the research efforts based on exact methods have been focused on the total travel distance, the focus of almost all heuristic attempts has been on the number of vehicles. Consequently, it is more difficult to compare and take advantage of the strong points from each approach. This paper proposes a robust heuristic approach for the VRPTW using travel distance as the main objective through an efficient genetic algorithm and a set partitioning formulation. The tests were produced using real numbers and truncated data type, allowing a direct comparison of its results against previously published heuristic and exact methods. Furthermore, computational results show that the proposed heuristic approach outperforms all previously known and published heuristic methods in terms of the minimal travel distance.

### MSC:

90B06 | Transportation, logistics and supply chain management |

90B10 | Deterministic network models in operations research |

90C59 | Approximation methods and heuristics in mathematical programming |

90B35 | Deterministic scheduling theory in operations research |

### Citations:

Zbl 0625.90047
PDFBibTeX
XMLCite

\textit{G. B. Alvarenga} et al., Comput. Oper. Res. 34, No. 6, 1561--1584 (2007; Zbl 1163.90357)

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