Process Control: Modeling, Design, and Simulation

M8.6. Other Considerations

Nonlinear Behavior

Although general nonlinear models were developed in this module, and some nonlinear steady-state results were presented, dynamic simulations were based on linear models. Although the responses on the physical (nonlinear) system will be similar to the linear results for small changes around the designed operating point, the nonlinear behavior can be significantly different for large changes.

Download the nonlinear SIMULINK/MATLAB files from the book web page and perform closed-loop simulations. Show that responses of the nonlinear system are similar to the linear simulations, for small setpoint changes. For a sequence of larger setpoint changes, show that the nonlinear system begins to deviate significantly ...