By Prof. Dr. ir. Brian Roffel, Dr. ir. Ben H. Betlem (auth.)

This textual content and reference deals an application-oriented method of procedure keep an eye on. It systematically explains strategy id, keep watch over and optimization, the 3 key steps had to resolve a multivariable keep an eye on challenge. idea is mentioned so far as it's had to comprehend and remedy the outlined challenge, whereas a variety of examples written in MATLAB illustrate the problem-solving procedure.

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The feed F and the reflux R affect the temperature in the tower (inferred composition). 96) Usually reflux changes act faster than feed changes, giving GFF the form ofa lead-lag with a small dead time. reflu x distillate Fig. 12. Flow feed-forward in distillation. 10 Feed-forward Control in a Smith Predictor 23 Another example of feed-forward control can be found around the overhead drum ofa distillation tower as shown in Fig. 12. An analyzer controller is manipulating a relatively small distillate flow.

This chapter was written as a tutorial. For more information on MATLAB and/or Simulink you have to consult the user manual. To start MATLAB, double click the corresponding icon, after a few moments the MATLAB Command Window will appear as shown in Fig. 1. In the command mode you can type MATLAB command to which we will come back later. Now type Simulink. What appears is the Simulink library browser, as shown in Fig. 2. You now have various options to select building blocks for your simulation. First, however, you have to indicate that you are going to build a new model.

Process subsystem. 3 Control Simulation of a 2x2 System 41 If Y1 is controlled by u], then Uz can be seen as a disturbance variable and a feedforward controller would be needed to eliminate the effect of Uz on YI . However, in this situation we do not speak of feed-forward control but of decoupling . The decoupler has, however, exactly the same structure as a feed-forward controller. The process is shown in Fig. 11, dead times are present and since the ratio of dead time over time constant is larger than two, the process cannot be adequately controlled without dead time compensation.

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