申論題

Problem 2 (22%) Consider a control system with the following loop transfer function

whose Nyquist path is shown in Fig. 2.

(a) I. (6%) Sketch the Nyquist plot of this system for K ＞ 0 in accordance with Fig. 2.
Ⅱ. Indicate clearly each mapping of point a:(2%)(0+jω,ω→∞⁺), b:(2%)(0+jω,ω→2⁺), c:(2%) (),d:(2%) (0+jω,ω→2^-) and e:(2%) (ω= 0) in your plot.