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hariz

hariz (view profile)

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How to find steady-error value from the response graph? is there any command to find the steady state error from the response graph?

Asked by hariz

hariz (view profile)

on 17 Nov 2014
Latest activity Edited by Arkadiy Turevskiy

Arkadiy Turevskiy (view profile)

on 26 Nov 2014
G(s)=5/s^2+2s+25

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Arkadiy Turevskiy

Arkadiy Turevskiy (view profile)

Answer by Arkadiy Turevskiy

Arkadiy Turevskiy (view profile)

on 26 Nov 2014
Edited by Arkadiy Turevskiy

Arkadiy Turevskiy (view profile)

on 26 Nov 2014

Your question is not formulated clearly. Did you mean steady-state value, not "steady-error value"? Assuming that's what you meant, the next clarification is steady-state value of a transfer function in response to what - is it in response to a step input?
If that's what you meant, then yes, you can do this like that:
>> s=tf('s');
>> sys=5/(s^2+2*s+25);
>> [y,t]=step(sys);
>> y(length(y))
ans =
0.20
You can also right click on a step plot, "Charecteristics", "Steady-state", as shown below:

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