fig420.m

realize analysis and design for computer-controlled system

% Generates Fig 4.20
% Computer Controlled Systems (3rd ed)
% Author: B. Wittenmark
% Last edit: 1997-07-02
% Copyright (c) 1996 by K. J. 舠tr鰉, B. Wittenmark and
% Department of Automatic Control, Lund Institute of
% Technology, Lund, Sweden

block420;
newplot;
set(gcf,'PaperUnits','centimeters','PaperPosition',[2 2 13 10])
set(gcf,'Units','centimeters','position',get(gcf,'PaperPosition'))


lw=0.9;
J1=10/9;
J2=10;
k=1;
d=0.1;
kI=1;
om0=sqrt(k*(J1+J2)/(J1*J2));
al=J1/(J1+J2);
be1=d/(J1*om0);
be2=d/(J2*om0);
ga=kI/(J1*om0);
de=1/(J1*om0);
h=0.5;
t0=0;
sfbdesign;
l1=L(1);
l2=L(2);
l3=L(3);
lc=l_c;
clf;
%
[t,x,y]=sim('block420',[0, 80]);
subplot(3,1,1);
plot(t,y(:,3),'k--',t,y(:,1),'k','Linew',lw);
axis([0,80,0,1.5]);
%title(['Fig 4.20']);
set(gca,'Fontsize',9,'Fontname','NewCenturySchlbk');
set(gca,'xtick',[0 20 40 60 80]);
set(gca,'ytick',[0 1]);
ylabel('Output','Fontname','NewCenturySchlbk','Fontsize',9)
drawnow;
%
subplot(3,1,2);
[ts,ys]=stairs(t,y(:,2));
plot(ts,ys,'m','Linew',lw);
axis([0,80,-1,2]);
set(gca,'Fontsize',9,'Fontname','NewCenturySchlbk');
set(gca,'xtick',[0 20 40 60 80]);
set(gca,'ytick',[-1 0 1 2]);
xlabel('Time','Fontname','NewCenturySchlbk','Fontsize',9)
ylabel('Input','Fontname','NewCenturySchlbk','Fontsize',9)
drawnow;
%
ylblalgn;