Question: Draw a Bode diagram of the open-loop transfer function $G(s)$ of the closed-loop system shown in Fig. P 3. 21 and obtain the phase margin

Draw a Bode diagram of the open-loop transfer function $G(s)$ of the closed-loop system shown in Fig. P 3. 21 and obtain the phase margin and gain margin.

R(s) 18(s +1) s(s +3)(s2 +2s +9) C(s)

Fig. P 3. 21

R(s) 18(s +1) s(s +3)(s2 +2s +9) C(s)

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