Question 2
Code for the first question :
G = tf([0.5 1.3],[1 1.2 1.6 0]); % transfer function gievn
K = 1; % value of K
sys = feedback(G*K,1); % close loop system
t = 0:0.01:28; % defining the time interval and
data will be taken with 0.01 interval
u = sin(2*t); % input function
y = lsim(sys,u,t);
plot(t,y) % this will plot the
data got at each interval
grid;
output = lsiminfo(y,t) % this will give the output
this is the result :
output =
SettlingTime: 27.9673
Min: -0.5493
MinTime:
3.9700
Max: 0.5712
MaxTime:
2.0800
From the graph we can find the values : Peak amplitude = 0.571, Rise time = 2.1s(approx), Settling time = 3.06s (Rise time for a sinusoid is the time at the first peak, and settling time is the time at the second zero crossing) and steady state value = not defined, since output is sinusoid
Question 3
Code for the 2nd problem
G =100*tf([1 12 20],[1 18 187 1110])
step(G); grid on;
Output = stepinfo(G)
Output =
RiseTime:
0.0154
SettlingTime: 1.1755
SettlingMin: 0.3105
SettlingMax: 6.9785
Overshoot: 287.3059
Undershoot: 0
Peak: 6.9785
PeakTime: 0.1436
Peak Amplitude: 6.98
Steady state value : 1.81
NOTE :
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