3. Consider a feedback control system given below, where the transfer function of the plant G(s) = 2(s - 1)/(s + 2)2(s2 + 2s +2), and the transfer function of the controller Gc(s), If Gc(s)=K,
申論題內容
(a). Determine the range of K, so that the unit-feedback control system is stable. (4%)