Lagrangean relaxation with clusters and column generation for the manufacturer's pallet loading problem

  • Authors:
  • Glaydston Mattos Ribeiro;Luiz Antonio Nogueira Lorena

  • Affiliations:
  • LAC-Computer and Applied Mathematics Laboratory, INPE-Brazilian Space Research Institute, 12.227-010, São José dos Campos-SP, Brazil;LAC-Computer and Applied Mathematics Laboratory, INPE-Brazilian Space Research Institute, 12.227-010, São José dos Campos-SP, Brazil

  • Venue:
  • Computers and Operations Research
  • Year:
  • 2007

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Abstract

We consider in this paper a new lagrangean relaxation with clusters for the Manufacturer's Pallet Loading Problem (MPLP). The relaxation is based on the MPLP formulated as a Maximum Independent Set Problem (MISP) and represented in a conflict graph that can be partitioned in clusters. The edges inter clusters are relaxed in a lagrangean fashion. Computational tests attain the optimality for some instances considered difficult for a lagrangean relaxation. Our results show that this relaxation can be a successful approach for hard combinatorial problems modeled in conflict graphs. Moreover, we propose a column generation approach for the MPLP derived from the idea behind the lagrangean relaxation proposed.