Resource constrained project scheduling: a real-world extension for steel industry
V. A. Hauder, A. Beham, S. Raggl, M. Affenzeller - Resource constrained project scheduling: a real-world extension for steel industry - Proceedings of the 30th European Modeling and Simulation Symposium EMSS2018, Budapest, Hungary, Ungarn, 2018
Project scheduling is an essential operational optimization task when precedence relations and the access to limited resources are problem inherent. In this work, a real-world production and logistics planning process of a steel manufacturer is modeled. Production activities have to be scheduled in a way such that real-world restrictions and objectives are considered. Therefore, the basis for this model is the well-known resource constrained project scheduling problem. However, for the consideration of all necessary real-world requirements, a new problem model with various extensions concerning project flexibility and the production of multiple lots is developed. Within a first step, the developed model is solved exactly for small instances by using IBM ILOG CPLEX. As a second step, for larger (real-world) instances which are not solvable within a reasonable time for real-world applications, a Constraint Programming model is developed and applied successfully for large real-world problem instances.