Question: For the control system shown in Fig. P 3. 23: (a) draw a Bode diagram of the open-loop transfer function (b) find the value of

For the control system shown in Fig. P 3. 23:

(a) draw a Bode diagram of the open-loop transfer function

(b) find the value of the gain $K$ such that the phase margin is $50^{\circ}$

(c) find the gain margin of the system with the gain obtained in (b).

+ s +0.3 12 K s +0.7 s(s +2)

Fig. P 3. 23

+ s +0.3 12 K s +0.7 s(s +2)

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