Economic Heuristic Optimization for Heterogeneous Fleet VRPHESTW
Publication: Journal of Transportation Engineering
Volume 132, Issue 4
Abstract
A three-step local search algorithm based on a probabilistic variable neighborhood search is presented for the vehicle routing problem with a heterogeneous fleet of vehicles and soft time windows (VRPHESTW). A generation mechanism based on a greedy randomized adaptive search procedure, a diversification procedure using an extinctive selection evolution strategy, and a postoptimization method based on a threshold algorithm with restarts are considered to solve the problem. The results show the convenience of using an economic objective function to analyze the influence of the changes in the economic environment on the transportation average profit of vehicle routing problems. Near real-world vehicle routing problems need (1) an economic objective function to measure the quality of the solutions as well as (2) an appropriate guide function, which may be different from the economic objective function, for each heuristic method and for each economic scenario.
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Acknowledgments
The present study was partially financed by the Spanish Ministry of Science and Technology under Grant BFM2001-2759. The writers are grateful to Debra Westall for her revision of the English version of this paper.
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© 2006 ASCE.
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Received: May 4, 2004
Accepted: Jul 15, 2005
Published online: Apr 1, 2006
Published in print: Apr 2006
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