申論題

5.Consider a control system with the following loop transfer function
-∞≤K≤∞

(b) Suppose that the Nyquist plot ( K ＞0) you obtained in part (a) is depicted in Fig. 2, where the
solid line is part of the Nyquist plot when ω is from ∞ ⁺ to 0⁺, and it has an intersection with axis
-Re(L(s)) at -K.

Using Nyquist criterion, determine the range of K ＞ 0 such that the closed-loop system can be stabilized.
If the system is unstable due to the range of K, find the number of closed-loop pole(s) in the right-half of
s-plane.