Question

Figure is missing from Chapter 5, Problem 19P (Modern Control Engineering (4th Edition)) . Please upload it again.

Answer 1

Problem from the book is:

MATLAB code for the question is given below

%----------code

clear all;
s=tf('s');
j=1; % initialization of j
Y=[]; %Initialization of Y matrix
Geta=[]; %Initialization of Geta vector
for i=0.2:0.2:1
geta=i;
G=(s+1)/(s^2+2*geta*s+1); % Transfer function
[y,t]=step(G,10); % step response for 10 seconds
Y(:,j)=y;
T=t;
Geta(j)=i;
j=j+1;
end
surf(T,Geta,Y') % 3D plot of response
title('Step response with different value of "geta" ')
xlabel('Time (sec)')
ylabel('geta')
zlabel('Output of response')

%---------------

The plot is shown below