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Diffstat (limited to '29/CH7/EX7.17.7/exa7_17_7.sce')
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diff --git a/29/CH7/EX7.17.7/exa7_17_7.sce b/29/CH7/EX7.17.7/exa7_17_7.sce new file mode 100755 index 000000000..7e96fc75e --- /dev/null +++ b/29/CH7/EX7.17.7/exa7_17_7.sce @@ -0,0 +1,14 @@ +//caption:stability_using_Nyquist_criterion +//example 7.17.7 +//page 244 +clf(); +s=%s; +s1=-s; +g=(2.2/(s*(s+1)*(s^2+2*s+2))) +g1=(2.2/(s1*(s1+1)*(s1^2+2*s1+2))) +GH=syslin('c',g); +GH1=syslin('c',g1); +nyquist(GH); +nyquist(GH1); +mtlb_axis([-2.5 0.2 -75 75]); +disp("as the nyquist plot passes through the point -1+%i*0, so system is marginally stable and output represents sustained oscillations.")
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