diff options
Diffstat (limited to '257/CH11/EX11.25/example_11_25.sce')
-rw-r--r-- | 257/CH11/EX11.25/example_11_25.sce | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/257/CH11/EX11.25/example_11_25.sce b/257/CH11/EX11.25/example_11_25.sce new file mode 100644 index 000000000..532d5db46 --- /dev/null +++ b/257/CH11/EX11.25/example_11_25.sce @@ -0,0 +1,20 @@ +s=poly(0,'s');
+F=syslin('c',[1/((1+0.001*s)*(s*0.1+1)*(0.25*s+1))]) //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 PM=40degrees, the point on the magnitude plot without k is 8dB away from 0dB line.
+k2=10^(8/20) // 20*log(k1)= 8 dB
+disp(k2,"for PM=40degrees k is ")
+F2=syslin('c',[(k2)/((1+0.001*s)*(s*0.1+1)*(0.25*s+1))])
+
+[GainMargin,freqGM]=g_margin(F2)
+disp(GainMargin,"GM=")
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