Steady state error

Question

Steady state error

lisiczka28 (Industrial)

(OP)

13 Feb 15 08:19

Hello everyone,
I would like to share with you my recent problem with calculating some matlab scripts.
My task is to find the value of the steady state error of an object (with negative feedback loop)

My main idea was to use "feedback" matlab function. Then get the information about the object:

var = feedback(object_transmittance, -1);
INFO = stepinfo(var)
error = INFO.SettlingMin

Thought the .SettlingMin parameter will return me the steady space error.

For now I know it's not correct. I've also tried to use some formulas searched on the net but with no result.
The task seems to be so simple, but I'm not using matlab like everyday, so even such simple things cause me some problems.
Any ideas?
Thank you in advance :)

IRstuff (Aerospace) · Answer 1 · 2015-02-13 17:58:46

Kind of hard with the actual data

TTFN
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xnuke (Electrical) · Answer 2 · 2015-02-13 20:43:13

You can use the method you've created, but you need to add some code to find the index n in your output vector y at which the SettlingMin value occurs, then find the value of (1-y[n]) to find the steady state error to the unit step.

xnuke
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Steady state error