How to measure the steady state amplitude of a control system output
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Michael Sohnen
el 7 de Mzo. de 2021
Comentada: Michael Sohnen
el 9 de Mzo. de 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 comentarios
Pat Gipper
el 8 de Mzo. de 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.
Respuesta aceptada
Michael Sohnen
el 9 de Mzo. de 2021
4 comentarios
Paul
el 9 de Mzo. de 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!
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Pat Gipper
el 8 de Mzo. de 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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