Control solution for some classes of nonlinear processes

Nonlinear phenomena largely characterize the real, surrounding world. One of the major targets of last decade automatic control is finding better solutions for nonlinear control. From this point of view, the paper proposes a hybrid (compensator based, feedback-feedforward) structure as control solution for some classes of nonlinear processes. This is developed using the nonlinear geometric characteristic of the process and a classical robust control algorithm. The components of the proposed structure are designed based on experimental tests, classic identification and closed loop pole placement methods. The applicability of the different implementations of the structure, suitable for each class of studied nonlinear processes, is demonstrated with a real-time control application implementing RST numerical algorithms. The software and the obtained results are presented and commented in terms of efficiency, advantages and disadvantages.