判断题
If the transfer function of the system has P poles in the left half of S-plane and the times of Nyquist curve encircling the (−1, j0) point is N, then the main condition for the stability of the closed-loop system is Z = N+ P = 0.
If the transfer function of the system has P poles in the left half of S-plane and the times of Nyquist curve encircling the (−1, j0) point is N, then the main condition for the stability of the closed-loop system is Z = N+ P = 0.