Homework SoursePLEASE ANSWER ALL QUESTIONS For the standard negative feedba
PLEASE ANSWER ALL QUESTIONS
For the standard negative feedback loop P(s) = 1/s, C(s) = K, F(s) = 1 unity feedback
2. For the feedback system in Problem 1, is it possible to tune the controller gain K so that the steady-state error e to step output disturbances dy is 0?
A. Always.
B. Never. (WRONG ANSWER)
C. Yes, when K > 0.
D. Yes, when K > 1.
E. None of the above.
A. (0.37s + 1.37)/s
B. (2s+1)/s
C. (0.067 s + 0.56)/s (WRONG ANSWER)
D. (1.23 s + 3.73)/s
E. None of the above.
4. PI controllers:
A. can eliminate constant disturbances from the output but they cannot increase the Bandwidth of the loop.
B. can eliminate constant disturbances from the output and always increase the Bandwidth of the loop.
C.cannot eliminate constant input disturbances from the output but they increase the Bandwidth of the loop.
D. can eliminate constant disturbances from the output and always decrease the Bandwidth of the loop. (WRONG ANSWER)
| A. Always. B. Never. (WRONG ANSWER) C. Yes, when K > 0. D. Yes, when K > 1. E. None of the above. | ||||
| 3. For the standard negative feedback loop P(s)=1/(s+1), C(s)=PI, F(s)=1 unity feedback, tune a PI controller C(s) for a crossover frequency of 0.5rad/s and a phase margin of at least 60deg. A. (0.37s + 1.37)/s B. (2s+1)/s C. (0.067 s + 0.56)/s (WRONG ANSWER) D. (1.23 s + 3.73)/s E. None of the above. | ||||
| 4. PI controllers: A. can eliminate constant disturbances from the output but they cannot increase the Bandwidth of the loop. B. can eliminate constant disturbances from the output and always increase the Bandwidth of the loop. C.cannot eliminate constant input disturbances from the output but they increase the Bandwidth of the loop.
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Solution
(2)
tuning is depending on gain K value and it must be greater than 0
so option C is correct
