Resumo

ALVES, Cláudio Manuel Martins  e  CARVALHO, José Manuel Valério de. Vehicle Routing in a Wood Waste Pickup System. Inv. Op. [online]. 2004, vol.24, n.1, pp.21-43. ISSN 0874-5161.

In this paper, we analyze a new vehicle routing problem, the Prize Collecting Vehicle Routing Problem with Service Restrictions (PCVRPsr), which arises in wood-waste collection. It is a problem with a homogeneous fleet and a unique depot, in which the visit to some clients in not compulsory, but conditioned by the total needs of waste. We propose a formulation for this problem, which comes from a three-index vehicle flow formulation for the Vehicle Routing Problem. To optimize the plan, we explore methods based on decomposition. We analyze, in particular, the Dantzig-Wolfe decomposition applied to this formulation, and a branch-and-price scheme to find integer solutions. An algorithm was developed to obtain the computational results discussed at the end of the paper. In the branch-and-price tree, we applied a method for deriving lower bounds for the bin-packing problem, based on dual feasible functions, that makes the process more efficient.

Palavras-chave : Routing; Transportation; Integer Programming.

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