Abstract
The Traveling Salesman Problem (TSP) is a well-known optimization problem with a wide range of extensions and applications in delivery systems. In this paper, we consider a recent extension of the TSP where a truck in collaboration with a single drone should visit a set of customers while minimizing the transportation times. We propose a Variable Neighbourhood Search (VNS) and a Multi-Start VNS (MS-VNS) algorithm, develop new neighbourhood structures, and compare the solutions against an existing mixed-integer linear programming (MILP) formulation. We take a set of instances based on existing benchmarks from the related literature. Results point out that the new neighbourhood structures substantially improve the performance of the VNS algorithms. Furthermore, results also show that the exact method is only able to find competitive solutions for small sets of instances, whereas our MS-VNS approach reaches better solution quality for large instances.
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