411-402 Process Dynamics and Control 2

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Objectives:

Students successfully completing this subject will be able to:

• identify situations where PID control is inadequate and recommend the use of dead time compensation and feed forward compensation;

• design a control scheme for chemical plants and implement decoupling where loop interaction is severe;

• understand interactive control system;

• understand computer-based and model-based control.

Content:

Dead time: examples of dead time in chemical plants, transfer function and Bode plots of dead time, destabilising effects of dead time. Load disturbances and feed forward compensation, comparison of feed-forward compensation and feedback control, Foxboro tuning rules. Computer as a PID controller, computer as a lead-lag element, computer-based supervisory control, structure of digital control system, sampling and Shannon's sampling system. Multiple-input multiple-output processes. Quantification of control loop interactions. Introduction to model-based control.

Assessment: