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 analyze the stability of the closed loop system b) Compute the stability margins from the Nyquist plot.

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

G(s)H(s)= Plot nyquist plot in Matlab using commands

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

Nyquist plot : b)

For stability margins

type command in matlab

>> margin(H)

and you will get the stability margins plot #### Earn Coins

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