Abstract
ABSTRACTThis paper proposes a two-commodity flow formulation for the MDVRP considering a heterogeneous vehicle fleet and maximum routing time. Its computational performance is compared to a traditional formulation, the so called three-index formulation, which is adapted to fit the same problem. With the creation of subtours being a problem within such formulations, four alternative sets of constraints are considered to eliminate them: the Dantzig–Fulkerson–Johnson constraint, the Miller–Tucker–Zemlin constraint, the transit load constraint, and the arrival time constraint. The resulting mixed-integer linear programming models are then applied to a number of benchmark instances and the obtained performance results are compared.
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