Y(s) -
Example 8 -> Find the closed-loop transfer function of the two-loop feedback system in Fig l. Also express the damping ratio and the un-damped natural frequency of the closed-loop system in terms of the gains a0 and al.
Figure 1
W(s)
Y(s)
U(s)
V(s)
W(s)
(a)
(b)
U(s)
Y(s)
U(s)
Y(s)
s(s+a)
s2 + as + a
uo
(d)
(c)
Equivalent block diagrams