?? ex6_4.m
字號:
G=tf(100,[conv([1,1],[0.0125,1]),0]);
Gc=leadlagc(G,50,50,100); zpk(Gc)
G_o1=Gc*G; w=logspace(0,4); ngrid('new');
nichols(G,w); nichols(G_o1,w), axis([-360,0,-40,40])
Gc=leadlagc(G,50,90,100); zpk(Gc)
G_o2=G*Gc; ngrid('new');
nichols(G,w); nichols(G_o2,w), axis([-360,0,-40,40])
[G1,P1,w1,w2]=margin(G_o2); [G1,P1,w1,w2]
Gc=leadlagc(G,100,50,100); zpk(Gc)
G_o3=G*Gc; ngrid('new');
nichols(G,w); nichols(G_o3,w), axis([-360,0,-40,40])
[G1,P1,w1,w2]=margin(G_o3); [G1,P1,w1,w2]
G_c1=feedback(G_o1,1); G_c2=feedback(G_o2,1); G_c3=feedback(G_o3,1);
[y1,t]=step(G_c1); y2=step(G_c2,t); y3=step(G_c3,t);
plot(t,[y1,y2,y3])
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