Nonlinear Control of Hydraulic Devices in Steel Industries
Sprache des Vortragstitels:
Hydraulic devices are used, where high forces must be generated by small devices, but the nonlinear behavior of these actuators deteriorates the dynamic behavior significantly in the large signal scenario like in steel industries. Steel rolling simulators are tools for material scientists for the study of the mechanical deformations, which occur in rolling mills, at a laboratory level. Special hydraulic pistons about 3m long are used to simulate the neighbor stands, hydraulic devices are used to control the rolling gap. High standards of reproducibility and precision are essential, but both are obtainable only by advanced control. Two methods for the nonlinear control of such devices will be presented, the first one uses energy considerations and a generalized Hamiltonian approach, whereas the second one is based on state feedback combined with a state, disturbance observer, also called internal model approach. The stability considerations for both methods will be accompanied by simulations and measurements of a cold rolling simulator, which belongs to one of the leading European steel companies.