How to measure the steady state amplitude of a control system output
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Michael Sohnen
on 7 Mar 2021
Commented: Michael Sohnen
on 9 Mar 2021
Dear Matlab Answers,
Hello. I have included below an image concerning my problem
Here I have a sinusoidal weaveform that has an initial transient then settles to a steady state amplitude. It looks odd ebcause the plot is so dense, but the data is all sinsoidal with a transient offset. The data is represented as an array of time points and an array of ampltiude points. (tout and Y). How can I write an algorithm to detect when the transient is complete and return the final steady state amplitude? Technically, this is not only a MATLAB question, but a solution written in MATLAB code is preffered.
5 Comments
Pat Gipper
on 8 Mar 2021
The frequency of the injected signal is under control of the app. If that is not the case then you would need to use some form of a spectrum analyzer.
Accepted Answer
Michael Sohnen
on 9 Mar 2021
4 Comments
Paul
on 9 Mar 2021
If your system is "far from LTI" then there is no guarantee, in general, that the steady state output is a single sinusoid. So you have to have some idea about what's going on inside the system and what the output should be.
Good luck. Go Panthers!
More Answers (1)
Pat Gipper
on 8 Mar 2021
Try using this app. It injects a sine wave and measures the gain and phase after a number of cycles that you specify.
https://www.mathworks.com/matlabcentral/fileexchange/85448-frequency-response-analyzer
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