Activity 37-2-Controller Tuning closed loop responses are for a proportional-onl

Question

Activity 37-2-Controller Tuning closed loop responses are for a proportional-only controller and a proportional-integral con- r decrease) troller. For each curve, state the needed change in tuning values (increase, no change,o PROPORTIONAL-ONLY PROPORTIONAL-INTEGRAL 1. Curve A proportional-only 5. Curve E proportional-integral 2. Curve B proportional-only. 6. Curve F proportional-integral. 3. Curve C proportional-only. 7. Curve G proportional-integral. 4. Curve D proportional-only. 8. Curve H proportional-integral.

Explanation / Answer

Curve A: the value of proportional controller needs to be reduced to improve the transient performance. That is to eliminate the oscillations.

Curve B: the transient performance is good that is oscillations are not observed. But the steady state error exists. Therefore to improve the steady state performance, the proportional gain is to be increased slightly.

Curve C: there are oscillations in the response. The proportional gain is the reduced to improve the transient performance.

Curve D: there are oscillations in the response. To improve the transient response, the proportional gain is to reduced.

Curve E: there are oscillations in the response. To improve the transient response, the proportional gain is to be reduced. At the same time the integral gain is to be increased to improve the steady state performance.

Curve F: there are oscillations in the response. The proportional gain is to be reduced to improve the transient performance. Integral gain can remain the same.

Curve G: there are oscillations in the response. The proportional gain is to be reduced to improve the transient performance. The integral gain can remain the same.

Curve H: The transient performance is good therefore there is no need to change the proportional gain. But there is a steady state error in the response. Therefore the integral gain is to be increased to improve the steady state performance.

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