Modelling for control of a Steckel Hot Rolling Mill

In this work the derivation of a nonlinear plant simulator of a Steckel Hot Rolling Mill process is shown. The simulator reflects the thickness crown and tension behaviour of the strip, while the temperature, shape and flatne ss behaviour of the strip fall outside the scope of this work. Roll gap, st and, tension and hydraulic actuator models are incorporated in order to yie ld the simulator. The nonlinear simulator is used to identify a linear mode l for control system design, The linear model was identified at a certain o perating point associated with a particular pass of a multiple pass rolling schedule. Step tests were applied to the manipulated variables of the simu lator, and using system identification (SID) techniques a linear time invar iant (LTI) multivariable input output (MIMO) transfer function model was id entified. Lastly an initial control problem is formulated.