blob: 92fedf2f604bcf755999639bac796ab11af3c669 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
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=")
|
