Step Response: Settling time not showing
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When plotting the step response of a system. If I enable the settling time characteristic and it doesn't show, is that implying that the settling time is 0 or that there is no settling time? It also shows NAN when I use stepinfo for the system.
Edit** More Info
So say I use this code to plot the step response of a transfer function:
s = tf('s');
G = 645*(1+s)/(0.001*s^3+1.02*s^2+(20*s)+645*(1+s))
t2 = 0:0.00001:.03;
step(G,t2);
Then when I right click the diagram and select characteristics -> settling time, nothing shows up.
Also if I use stepinfo(G)
Settling time only returns NaN
2 Comments
José-Luis
on 30 May 2014
Please provide more details. Please do realize that people here have no idea what you are doing.
Answers (1)
Star Strider
on 30 May 2014
Edited: Star Strider
on 31 May 2014
This works:
s = tf('s');
G = 645*(1+s)/(0.001*s^3+1.02*s^2+(20*s)+645*(1+s))
t2 = 0:0.00001:.03;
[y,t] = step(G,t2);
si = stepinfo(y,t)
produces:
si =
RiseTime: 2.3554e-003
SettlingTime: 7.3168e-003
SettlingMin: 875.4812e-003
SettlingMax: 1.0498e+000
Overshoot: 7.9921e+000
Undershoot: 0.0000e+000
Peak: 1.0498e+000
PeakTime: 4.9400e-003
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