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i-pig

铁虫 (初入文坛)

[求助] 请教大家一个Hinf控制问题,谢谢

MATLAB里面的hinfopt函数,同时求出控制器和控制器作用下闭环系统的状态方程,验证闭环系统时,为什么结果不一样呐,一种是用函数直接求得的闭环系统做阶跃,另一种是控制器和原传递函数连接再反馈,下面是代码,拜托牛人给小弟解释一下吧,我快疯了……
time=0:0.1:10;

[ag,bg,cg,dg] = tf2ss([1 -1],[1 -2]);
ssg = mksys(ag,bg,cg,dg);
w1 = [0.1*[1 100];[100 1]]; w2 = [0.1;1]; w3 = [];

[TSS] = augtf(ssg,w1,w2,w3);
[gamopt,sscp,sscl] = hinfopt(TSS);


[acp,bcp,ccp,dcp]=branch(sscp); % unpacking controller
[acl,bcl,ccl,dcl]=branch(sscl); % unpacking closed-loop tf-function


% closed loop (=T) from the hinfopt-output
cl=ss(acl,bcl,ccl,dcl);
[Y_cl,t_cl,X_cl]=step(cl,time);


% T calculated with series and feedbk
[aG,bG,cG,dG]=series(acp,bcp,ccp,dcp,ag,bg,cg,dg);
[aT,bT,cT,dT]=feedbk(aG,bG,cG,dG,1);
ss_T1=ss(aT,bT,cT,dT);
[Y_T1,t_T1,X_T1]=step(ss_T1,time);

figure(1)
subplot(2,2,1);plot(time,Y_cl(:,1,1))
subplot(2,2,2);pzmap(cl)
subplot(2,2,3);plot(time,Y_T1(:,1,1))
subplot(2,2,4);pzmap(ss_T1)

[ Last edited by i-pig on 2011-5-16 at 11:56 ]
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