chapter7_9.m

《MATLAB在控制系统中的应用》实例程序

ng0=[1];dg0=conv([1,0],conv([0.1,1],[0.2,1]));g0=tf(ng0,dg0); 
t=[0:0.01:10];w=logspace(-2,2); 
KK=25;Pm=40;wc=2.5; 
[ngc,dgc]=lag3(ng0,dg0,w,KK,wc) 
gc=tf(ngc,dgc),g0c=tf(KK*g0*gc); 
b1=feedback(g0,1);b2=feedback(g0c,1); 
step(b1,t), grid on,hold on,step(b2,t),hold off 
figure,bode(KK*g0,w),grid on,hold on,bode(g0c,w);hold off 
[gm,pm,wcg,wcp]=margin(g0c)