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13 Problem A8.17 OGATA 4ed(Nyquist plot)



Let's draw Nyquist plot for the values of $K=1,7.5,20$ by Scilab

\begin{displaymath}G(s)\cdot H(s)=\frac{10\cdot K}{s\cdot (s+5)\cdot (0.1*s+1)}\end{displaymath}

Scilab program 
clf;

s=%s/(%pi*2);

k=[1 7.5 20]

for i=1:3,

g(i)=10*k(i)/(s*(s+5)*(0.1*s+1));

gs(i)=syslin('c',g(i));

end;

nyquist([gs(1);gs(2);gs(3)]
,['K=1';'K=7.5';'K=20']);

mtlb_axis([-5 1 -5 1])

 


Image ProblemaA8-17Pag607