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| author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
|---|---|---|
| committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
| commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
| tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /257/CH11/EX11.11/example_11_11.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
Diffstat (limited to '257/CH11/EX11.11/example_11_11.sce')
| -rw-r--r-- | 257/CH11/EX11.11/example_11_11.sce | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/257/CH11/EX11.11/example_11_11.sce b/257/CH11/EX11.11/example_11_11.sce new file mode 100644 index 000000000..cb661deb9 --- /dev/null +++ b/257/CH11/EX11.11/example_11_11.sce @@ -0,0 +1,31 @@ +s=poly(0,'s');
+F=syslin('c',[1/((1+s)*s*(0.1*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 GM=30 dB, the point on the plot without k is 10dB away from 0dB line.
+k1=10^(-10/20) // 20*log(k1)=-10
+disp(k1,"k for GM=30 is ")
+F1=syslin('c',[(k1)/((1+s)*s*(0.1*s+1))])
+
+[PhaseMargin,freqPM]=p_margin(F1)
+disp(freqPM*2*3.14,"corresponding omegaGC")
+disp(PhaseMargin,"PM=")
+
+// for PM=30degrees, the point on the magnitude plot without k is 6dB away from 0dB line.
+k2=10^(6/20) // 20*log(k1)= 6 dB
+disp(k2,"for PM=30degrees k is ")
+F2=syslin('c',[(k2)/((1+s)*s*(0.1*s+1))])
+
+[PhaseMargin,freqPM]=p_margin(F2)
+disp(freqPM*2*3.14,"corresponding omegaGC")
+[GainMargin,freqGM]=g_margin(F)
+disp(GainMargin,"GM=")
\ No newline at end of file |