fig86.m

realize analysis and design for computer-controlled system

% Generates Fig 8.6
% Computer Controlled Systems (3rd ed)
% Author: B. Wittenmark
% Last edit: 1997-07-09
% Copyright (c) 1996 by K. J. 舠tr鰉, B. Wittenmark and
% Department of Automatic Control, Lund Institute of
% Technology, Lund, Sweden

newplot;clf;
set(gcf,'PaperUnits','centimeters','PaperPosition',[2 2 13 10])
set(gcf,'Units','centimeters','position',get(gcf,'PaperPosition'))
clear
lw=0.9;

h=0.02;
b0=4;
b1=-4*(1-h);
a1=-(1-2*h);
block86;
%
%set_param('block86/Controller','Sample time',h);
[t,x,y]=sim('block86',[0, 10]);
subplot(3,1,1);
plot(t,y(:,3),'k--',t,y(:,1),'k--','Linew',lw);
hold on;
axis([0,10,0,1.5]);
set(gca,'Fontsize',9,'Fontname','NewCenturySchlbk');
set(gca,'xtick',[0 10]);
set(gca,'ytick',[0 1]);
ylabel('Output','Fontname','NewCenturySchlbk','Fontsize',9)
%
subplot(3,1,2);
plot(t,y(:,2),'k--','Linew',lw);
hold on;
axis([0,10,-2,5]);
set(gca,'Fontsize',9,'Fontname','NewCenturySchlbk');
set(gca,'xtick',[0 10]);
set(gca,'ytick',[-2 0 2 4]);
ylabel('Input','Fontname','NewCenturySchlbk','Fontsize',9)
xlabel('Time','Fontname','NewCenturySchlbk','Fontsize',9)
%
h=0.1;
b0=4;
b1=-4*(1-h);
a1=-(1-2*h);
%
%set_param('block86/Controller','Sample time',h);
[t,x,y]=sim('block86',[0, 10]);
subplot(3,1,1);
plot(t,y(:,1),'k-.','Linew',lw);
%
h=0.25;
b0=4;
b1=-4*(1-h);
a1=-(1-2*h);
%
%set_param('block86/Controller','Sample time',h);
[t,x,y]=sim('block86',[0, 10]);
subplot(3,1,1);
plot(t,y(:,1),'k-','Linew',lw);
%
subplot(3,1,2);
[ts,ys]=stairs(t,y(:,2));
plot(ts,ys,'m-','Linew',lw);
%
h=0.5;
b0=4;
b1=-4*(1-h);
a1=-(1-2*h);
%
%set_param('block86/Controller','Sample time',h);
[t,x,y]=sim('block86',[0, 10]);
subplot(3,1,1);
plot(t,y(:,1),'k:','Linew',lw);
%
ylblalgn
%close_system('block86',0)