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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/EX11.21/example_11_21.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
Diffstat (limited to '257/CH11/EX11.21/example_11_21.sce')
| -rw-r--r-- | 257/CH11/EX11.21/example_11_21.sce | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/257/CH11/EX11.21/example_11_21.sce b/257/CH11/EX11.21/example_11_21.sce new file mode 100644 index 000000000..897b351bd --- /dev/null +++ b/257/CH11/EX11.21/example_11_21.sce @@ -0,0 +1,24 @@ +s=poly(0,'s');
+F=syslin('c',[k/((1+0.2*s)*s*(0.05*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
+
+k= 10^(26/20)
+disp(k,"k marginal = ")
+
+// for GM=10 dB, the point on the plot without k is 16dB away from 0dB line.
+k1=10^(16/20) // 20*log(k1)=-10
+disp(k1,"k for GM=10 is ")
+
+
+// for PM=40degrees, the point on the magnitude plot without k is 12dB away from 0dB line.
+k2=10^(12/20) // 20*log(k1)= 6 dB
+disp(k2,"for PM=40degrees k is ")
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