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Diffstat (limited to '257/CH11/EX11.5')
| -rw-r--r-- | 257/CH11/EX11.5/example_11_5.sce | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/257/CH11/EX11.5/example_11_5.sce b/257/CH11/EX11.5/example_11_5.sce new file mode 100644 index 000000000..979edfc80 --- /dev/null +++ b/257/CH11/EX11.5/example_11_5.sce @@ -0,0 +1,24 @@ +s=poly(0,'s');
+F=syslin('c',[1/((2+s)*s*(s+10))]) //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
+
+[GainMargin,freqGM]=g_margin(F) //Calculates gain margin [dB] and corresponding frequency [Hz]
+disp(GainMargin,"GM=")
+disp(freqGM*2*3.14,"omegaPC=")
+
+[PhaseMargin,freqPM]=p_margin(F) //Calculates phase [deg] and corresponding freq [Hz] of phase margin
+disp(PhaseMargin,"PM=")
+disp(freqPM*2*3.14,"omegaGC")
+
+show_margins(F) //display gain and phase margin and associated crossover frequencies
+
+// TO FIND VALUE OF K
+
+//we have to make omegaPC=omegaGC. the required upward shift is 22dB
+k1=10^(22/20) // 20*log(k1)=22
+disp(20*k1,"k marginal = ")
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