Question: Let the model of a plant be represented using a FOPTD model as G p = 2 5 s + 1 e - 2 s

Let the model of a plant be represented using a FOPTD model as

G_{p} = \frac{2}{5 s + 1} e^{- 2 s} .

A proportional controller with a gain of

15

and a smith predictor is used to control such a process. For a given set

-

point

(

anything can be considered

),

if there is a

+ - 20 %

error in values of process gain, time constant and time delay

(

consider at least

3

different values of each variable

),

provide your comments on the response of Smith predictor control. Discuss on change in which among the three variables is more sensitive i

.

.,

discuss on relative

1

importance on each type of error in process variables. Further comment on how large a change in gain, time constant and time delay be tolerated before the control loop goes unstable?

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