1 files changed, 21 insertions, 0 deletions
diff --git a/257/CH11/EX11.27/example_11_27.sce b/257/CH11/EX11.27/example_11_27.sce
new file mode 100644
index 000000000..92fedf2f6
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+++ b/257/CH11/EX11.27/example_11_27.sce
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+s=poly(0,'s'); 
+F=syslin('c',[1/((121+13*s+s^2)*s)])                  //without k
+
+fmin=0.1;                                        //Min freq in Hz
+fmax=20;                                          //Max freq in Hz
+
+scf(1);clf;
+bode(F,fmin,fmax);                                //Plots frequency response of open-loop system in Bode diagram
+
+show_margins(F)                                //display gain and phase margin and associated crossover frequencies
+
+// TO FIND VALUE OF K
+
+// for GM=12 dB, the point on the plot without k is 119.5dB away from 0dB line.
+k1=10^(52/20)         // 20*log(k1)=52
+disp(k1,"k=")
+F1=syslin('c',[(k1)/((121+13*s+s^2)*s)])
+
+[PhaseMargin,freqPM]=p_margin(F1)                
+disp(PhaseMargin,"PM=")
+