fig6_48.m

包含了控制理论的各种仿真程序

% Fig. 6.48   Feedback Control of Dynamic Systems, 4e 
%             Franklin, Powell, Emami
%

clear all;
close all;

num=0.01*[20 1];
den=[1 0 0]+[0 num];
w=logspace(-3,1,100);
[m,p]=bode(num,den,w);
loglog(w,m);
axis([.01 1 .1 10])
grid;
hold on
% add line at mag = 0.707
w2=[.01 1];
mcl=[.707 .707];
loglog(w2,mcl,'r')
xlabel('\omega (rad/sec)');
ylabel('magnitude');
title('Fig. 6.48 Closed-loop frequency response.');
hold off