ex2_9.m

离散控制系统设计的MATLAB 代码

%%%%%%%%%%%%%%%%%% Example 2.9 %%%%%%%%%%%%%%%%%%
%   Discrete-Time Control Problems using        %
%       MATLAB and the Control System Toolbox   %
%   by J.H. Chow, D.K. Frederick, & N.W. Chbat  %
%         Brooks/Cole Publishing Company        %
%                September 2002                 %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%   ---- Poles and system stability ----
%
clear
disp('Example 2.9')
numG = [3 1.8 1.08]                  % generate G(z) as TF object
denG = [1 -1.25 0.495 -0.0035 -0.1862]
G = tf(numG,denG,1)                  % sampling period = 1.0 s
disp('******>'), pause 

disp('Poles of G via pole command')
xy2p(pole(G));                       % poles of G via pole command
disp('Poles of G via roots command')
xy2p(roots(denG));                   % poles of G via roots command 


%----------- poles and zeros ---------------
figure
ucircle, hold on                     % show unit circle in z-plane
pzmap(G), hold off                   % draw pole-zero plot
title('Example 2.9')
set_xo_size                          % make larger X's ans O's
disp('Plotting pole-zero locations')
disp('******>'), pause 
%----------- delta response ----------
k = 0:80;
y = impulse(G,k);                    % compute delta response of G(z)
figure
stem(k,y,'o:');grid                  % plot with dotted stems & o's
xlabel('Time (s)')
ylabel('Amplitude')
title('Impulse response for Example 2.9')
disp('Plotting impulse response')
%%%%%%%%%%