Determine the maximum gain of the system, Chemical Engineering

Consider a heat-exchanger control loop with no dead time.  It is controlled by a PD controller.  The rate time is 0.25 min.  A real PD controller is used with filtering where a = 0.1.

604_chemical eq..png

The heat exchanger control loop has the following transfer function (time constants in seconds)

2460_chemical eq 2.png

Determine the maximum gain of the system Kcu.  What are the corresponding GM & PM if we set Kc = Kcu/1.7.

 

 

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