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diff --git a/29/CH7/EX7.17.2.ii/exa7_17_2_ii.sce b/29/CH7/EX7.17.2.ii/exa7_17_2_ii.sce new file mode 100755 index 000000000..fb8acfc23 --- /dev/null +++ b/29/CH7/EX7.17.2.ii/exa7_17_2_ii.sce @@ -0,0 +1,20 @@ +//caption:stability_using_Nyquist_criterion +//example 7.17.2_ii +//page 237 +disp("for K=2.5") +g=(2.5*(s+1))/((s+0.5)*(s-2)); +g1=(2.5*(s1+1))/((s1+0.5)*(s1-2)); +GH=syslin('c',g); +GH1=syslin('c',g1); +nyquist(GH); +nyquist(GH1); +mtlb_axis([-3 0.5 -0.6 0.6]); +xtitle('Nyquist plot of (2.5*(s+1))/((s+0.5)*(s-2))') +figure; +show_margins(GH,'nyquist') +disp("since the point(-1+%i0) is encircled anticlockwise by Nyquist plot ,so N=1 and P=1(given)") +N=1;//no. of encirclement of -1+%i0 by G(s)H(s) plot anticlockwise +P=1;//no. of poles of G(s)H(s) with positive real part +Z=P-N;//np.of zeros of 1+G(s)H(s)=0 with positive real part +disp(Z,"Z=") +disp("as Z=0,there are no roots of closed loop characterstics eq having positive real part, hence system is stable.")
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