Dominance-based linear formulation for the Anchor-Robust Project Scheduling Problem

Pascale Bendotti (1, 2) , Philippe Chrétienne (2) , Pierre Fouilhoux (2) , Adèle Pass-Lanneau (1, 2)

1 EDF R&D OSIRIS - Optimisation, Simulation, Risque et Statistiques pour les Marchés de l’Energie
2 RO - Recherche Opérationnelle

In project scheduling under processing times uncertainty, the Anchor-Robust Project Scheduling Problem is to find a baseline schedule of bounded makespan and a max-weight subset of jobs whose starting times are guaranteed. The problem was proven NP-hard even for budgeted uncertainty. In the present work we design mixed-integer programming (MIP) formulations that are valid for a variety of uncertainty sets encompassing budgeted uncertainty. A new dominance among solutions is proposed, resulting into an MIP formulation. We further study the combinatorial structure of the problem. Non-trivial polynomial cases under budgeted uncertainty are exhibited, where the dominance-based formulation yields a polyhedral characterization of integer solutions. In more general cases, the dominance-based formulation is shown to be tighter than all previously known formulations. In numerical experiments we investigate how the formulation performs on instances around the polynomial cases, for both budgeted uncertainty sets and more elaborate uncertainty sets involving several budgets.

Mots clés: project scheduling; combinatorial optimization; mixed-integer programming; robust 2-stage optimization; polyhedral characterization

Domaines: Informatique [cs]; Mathématiques [math]

Pascale Bendotti, Philippe Chrétienne, Pierre Fouilhoux, Adèle Pass-Lanneau. Dominance-based linear formulation for the Anchor-Robust Project Scheduling Problem. European Journal of Operational Research, 2021, 295 (1), pp.22-33. ⟨10.1016/j.ejor.2021.02.034⟩. ⟨hal-02938158v2⟩