Lower-bounding and heuristic methods for a refuse collection vehicle routing problem

• Autor(a) principal: Mourão, M. Cândida
• Data de Publicação: 2000
• Outros Autores: Almeida, M. Teresa
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.5/27884
• topic: Routing; Lower Bounds; Heuristics

A set of routes that minimizes the total collecting cost of the household refuse in a quarter of Lisbon may be obtained solving a Capacitated Arc Routing Problem (CARP) with side constraints. The CARP is known to be an NP-hard problem. We present two lower-bounding methods, both based on the transportation model, in which we have been able to incorporate some of the side constraints. We also present a three-phase heuristic to generate a near-optimal solution from the solution obtained with the first lower-bounding method. For the relative gap between the heuristic solution value and its associated lower bound value we give a theoretical worst-case bound and computational experience obtained with a set of test problems.