NONLINEAR CONTROL OF SYSTEMS WITH INPUT AND OUTPUT MULTIPLICITIES

Control of nonlinear systems with input and output multiplicities is t heoretically analysed. The system is an isothermal CSTR with a nonidea l mixing represented by a Cholette's model and with a chemical reactio n rate k(1)c/(1 + k(2)c)(2). The system exhibits input multiplicities in the feed concentration and also output multiplicities in the reacto r exit concentration. For control system design the nonlinear system i s represented by a nonlinear gain cascaded with a linear dynamical sys tem. The performance of an integral controller designed for the overal l linear system is compared with that of a nonlinear integral controll er. The nonlinear integral controller does not have the problem of mov ing the input to a different level for a square pulse disturbance.