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Consider the feedback control system in Fig. 1 4 . 8 , and the following transfer functions: Gc = Kc ( 2 s + 1

Consider the feedback control system in Fig. 14.8, and
the following transfer functions:
Gc = Kc
(2s +1
0.1s +1
)
Gv =2
0.5s +1
Gp =0.4
s(5s +1)
Gd =3
5s +1
Gm =1
(a) Plot a Bode diagram for the open-loop transfer function.
(b) Calculate the value of Kc that provides a phase margin
of 30.
(c) What is the gain margin when Kc =10?

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