ex5_15.m

反馈控制系统设计与分析（matlab程序）

G=tf([5,0.96,9.6],[conv([1,2,1],[1,0.384,2.56]),0]);
nyquist(G); axis('square'), axis([-3,0,-1.5,1.5])
G_c=feedback(G,1); roots(G_c.den{1})

rlocus(G), axis('square'), axis([-1.2,0.2,-2,2])
k1=rlocfind(G)

k2=rlocfind(G)

k3=rlocfind(G)

G=tf(0.5*[5,0.96,9.6],[conv([1,2,1],[1,0.384,2.56]),0]);
nyquist(G); axis('square'), axis([-3,0,-1.5,1.5])

G_c=feedback(G,1);  step(G_c)