Sequential supervisory control, modelling and simulation of a multipass experimental rolling mill

This paper presents a Grafcet Model to control a laboratory-scale rolling mill and describes the design of a hybrid modelling and simulation strategy, its implementation in the G2 Real-time Expert System, and its application to the rolling mill. The rolling mill with its process variables and datalogging system is described. Grafcet is briefly overviewed, together with the implementation of the model on the rolling mill. The hybrid model base for the mill is designed from a combination of Object-Orientation, Rule-based Programming, GRAFCET, Equations, and procedures. The strategy, implemented in the real-time expert system, G2, involves the concurrent execution of three simulators: a continuous simulator, a GRAFCET simulator, and a heuristic simulator. (author)