Abstract
This paper presents a new modeling and control techniques for the steel sheet processing line based on a Hybrid Petri Nets (HPN) and Mixed Logical Dynamical Systems (MLDS) expressions. In the steel sheet processing line, the dynamics of sheets is represented by the differential (or difference) equation. On the other hand, some logical constraints such as change and/or inspection of the steel sheets are described by the discrete event-driven model. The proposed modeling method can harmoniously integrate these two different aspects, and can provide a suitable formulation for the optimization of the steel sheet processing line. Based on this hybrid system modeling, the closed-loop control can be realized by receding horizon scheme. Numerical examples demonstrate the usefulness of the proposed method.
