Scilab Prog: To study of effect of addition of zeros and poles to the forward path transfer function of a closed loop system

clc;

clf;

s=%s;

T=syslin('c',1,s+1);//Transfer function of a closed loop system.

P=syslin('c',1,s+2);// A pole at s=-2.

Tf=T*P;// Addition of a pole at s=-2 to the transfer function.

t=0:0.1:10;

Y1=csim('impulse',t,Tf);

Z=syslin('c',s,1);// A zero at s=0.

Tf1=T*Z;// Addition of a zero at s=0 to the transfer function.

Y2=csim('impulse',t,Tf1);

subplot(231);

plzr(T);

subplot(232);

plzr(Tf);

subplot(233);

plzr(Tf1);

subplot(234);

title('Addition of pole at s=-2 to the tf=1/(s+1)','fontsize',3);

plot(t,Y1);

xlabel('t','fontsize',3);

ylabel('Y(t)','fontsize',3);

subplot(235);

title('Addition of zero at s=0 to the tf=1/(s+1)','fontsize',3);

plot(t,Y2);

xlabel('t','fontsize',3);

ylabel('Y(t)','fontsize',3);

Note : Students are advised to write discussion yourself i.e. what are you getting information from the plots.