ex7-stability.rar_control_stability_stability control

close all; clc; a=[0 1;-25 -4]; b=[0;25]; c=[1 0]; d=[0]; td=0.2; [num den]=ss2tf(a,b,c,d); system=tf(num,den,'inputdelay',td); sys=pade(system,2); [GM PM Wgc Wpc]= margin(sys) figure(1); margin(sys); grid; figure(2); rlocus(sys); grid; figure(3); nyquist(sys); grid; figure(4); sys=feedback(sys,1); step(sys,'-'); grid; if(PM>0 && GM>0) fprintf('System is stable'); else fprintf('System is not stable') end