A hybrid constraint programming approach to the log-truck scheduling problem

Nizar El Hachemi (), Michel Gendreau () and Louis-Martin Rousseau ()

Annals of Operations Research, 2011, vol. 184, issue 1, 163-178

Abstract: Scheduling problems in the forest industry have received significant attention in the recent years and have contributed many challenging applications for optimization technologies. This paper proposes a solution method based on constraint programming and mathematical programming for a log-truck scheduling problem. The problem consists of scheduling the transportation of logs between forest areas and woodmills, as well as routing the fleet of vehicles to satisfy these transportation requests. The objective is to minimize the total cost of the non-productive activities such as the waiting time of trucks and forest log-loaders and the empty driven distance of vehicles. We propose a constraint programming model to address the combined scheduling and routing problem and an integer programming model to deal with the optimization of deadheads. Both of these models are combined through the exchange of global constraints. Finally the whole approach is validated on real industrial data. Copyright Springer Science+Business Media, LLC 2011

Date: 2011
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DOI: 10.1007/s10479-010-0698-x

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