Question

2. A unity feedback system has the following open-loop transfer function -0.5s + 0.5 G(s)i a)...

2. A unity feedback system has the following open-loop transfer function -0.5s + 0.5 G(s)i a) Obtain the Nyquist plot and ana

2. A unity feedback system has the following open-loop transfer function -0.5s + 0.5 G(s)i a) Obtain the Nyquist plot and analyze the stability of the closed loop system b) Compute the stability margins from the Nyquist plot.
0 0
Add a comment Improve this question
Answer #1

a) for unity feedback system H(s)=1

G(s)H(s)= \frac{-0.5s+0.5}{s(s^{2}+ 0.4s +4)}

Plot nyquist plot in Matlab using commands

>> H = tf([-0.5 0.5],[1 0.4 4 1]);
>> nyquist(H)

Nyquist plot :

Nyquist Diagram 1.5 0.5 -0.5 -2 1.5 0.5 05 Real Axis

b)

For stability margins

type command in matlab

>> margin(H)

and you will get the stability margins plot

Bode Diagram Gm-1.34 dB (at 1.89 rad/s), Pm 6.64 deg (at 1.86 rad/s) 20 System H Frequency (rad/s): 1.86 Magnitude (dB): -0.0

Add a comment
Know the answer?
Add Answer to:
2. A unity feedback system has the following open-loop transfer function -0.5s + 0.5 G(s)i a)...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT