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4. Consider the feedback control system shown in Figure 6, where the transfer function G(s) is given by 8000 (S+10 (s+30) G(s)- R(s) C(s) G(s) Y(s) Figure (6 (a) Design a lead controller C(s) K to satisfy the following specifications: (i) Gain crossover frequency o-10V3 (ii) Phase margin ( 2 60° Specify the values of K, T and a . Determine the corresponding position error constant K (15 Marks) Suppose the self-oscillation method is used to design a PID controller C(s) for the control system shown in Figure 6. Determine the critical proportional gain Kar and the critical oscillation period Pr (b) (10 Marks)

Please explain the steps taken in detail for both part a) and b). Thank you very much.

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