Heuristic algorithms for the operator-based relocation problem in one-way electric carsharing systems |
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Affiliation: | 1. Dipartimento di Design, Politecnico di Milano, Milano, Italy;2. Dipartimento di Ingegneria dell’Informazione, Università Politecnica delle Marche, Ancona, Italy;3. Facoltà di Ingegneria, Università degli Studi e-Campus, Novedrate (Como), Italy |
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Abstract: | This paper addresses an Electric Vehicle Relocation Problem (E-VReP), in one-way carsharing systems, based on operators who use folding bicycles to facilitate vehicle relocation. In order to calculate the economic sustainability of this relocation approach, a revenue associated with each relocation request satisfied and a cost associated with each operator used are introduced. The new optimization objective maximizes the total profit. To overcome the drawback of the high CPU time required by the Mixed Integer Linear Programming formulation of the E-VReP, two heuristic algorithms, based on the general properties of the feasible solutions, are designed. Their effectiveness is tested on two sets of realistic instances. In the first, all the requests have the same revenue, while, in the second, the revenue of each request has a variable component related to the user’s rent-time and a fixed part related to customer satisfaction. Finally, a sensitivity analysis is carried out on both the number of requests and the fixed revenue component. |
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Keywords: | Carsharing Operator based relocation Economic sustainability Pick-up and delivery problem with time windows Mixed integer linear programming Ruin and Recreate metaheuristic |
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