12 Problem A6.13 OGATA 4edition (root locus)

Laplace.T	Root-locus	Transient response	Frecuency response

12 Problem A6.13 OGATA 4edition (root locus)

Let us calculate the root-locus of a closed-loop system with feedback by Scilab, whose transfer function in open loop is:

$\begin{displaymath}G(s)=\frac{K\cdot (s+2)^{2}}{(s^{2}+4)\cdot (s+2)^{2}}\end{displaymath}$
Program in Scilab
s=%s;
num=(s+2)^2;
den=(s^2+4)*(s+5)^2;
g=syslin('c',num/den);
clf;
evans(g);
v=[-8 4 -6 6]
mtlb_axis(v);
xgrid;