10 Problem A6.11 OGATA 4edition (root locus)

Laplace.T	Root-locus	Transient response	Frecuency response

10 Problem A6.11 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:

$\begin{displaymath}G(s)=\frac{K\cdot(s+0.4)}{s^{2}\cdot (s+3.6)}\end{displaymath}$
Program in Scilab
s=%s;
num=s+0.4;
den=s^2*(s+3.6);
g=syslin('c',num/den);
clf;
evans(g);
v=[-5 1 -3 3]
mtlb_axis(v);
xgrid;