Article ID: | iaor20082990 |
Country: | United Kingdom |
Volume: | 45 |
Issue: | 20 |
Start Page Number: | 4873 |
End Page Number: | 4894 |
Publication Date: | Jan 2007 |
Journal: | International Journal of Production Research |
Authors: | Oliveira Jos F., Carravilla Maria Antnia, Klabjan Diego, Almada-Lobo Bernardo |
Keywords: | programming: integer, heuristics |
In production planning in the glass container industry, machine-dependent setup times and costs are incurred for switchovers from one product to another. The resulting multi-item capacitated lot-sizing problem has sequence-dependent setup times and costs. We present two novel linear mixed-integer programming formulations for this problem, incorporating all the necessary features of setup carryovers. The compact formulation has polynomially many constraints, whereas the stronger formulation uses an exponential number of constraints that can be separated in polynomial time. We also present a five-step heuristic that is effective both in finding a feasible solution (even for tightly capacitated instances) and in producing good solutions to these problems. We report computational experiments.