Improving stability and regulation quality of nonlinear MIMO processes

Abstract The paper presents results of comparative analysis of the control system introducing dynamic decoupling and the robust two-degrees of freedom control system with the use of the decoupled nominal model of the linearized MIMO process. First the design method of the control system with dynamic decoupling of MIMO processes has been replayed. Next, basic advantages of the model following control structure for MIMO systems, its stability and robustness properties are presented. Finally, a MFC-MIMO robust control system has been proposed. The presented control structure has been tested for its performance on the tracking processes of yaw angle and position of the drillship. Results of simulation tests lend support to the view that the proposed MIMO-MFC control method may find wide application to robust control of nonlinear plants with time-varying or perturbed parameters.