FRF plot on acceleration data
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Hi all, I have a range of acceleration reading output at every 0.02s and would like to get a Frequency Response Function plot. Any body can help with the suitable code in Matlab? Thanks
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Answers (2)
Star Strider
on 23 Nov 2015
If you know the input of the system as a function of time as well, and the data for both the input and output were collected over the same time interval at the same sampling times, you can calculate the frequency response function as:
FRF = fft(output)./fft(input);
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Star Strider
on 23 Nov 2015
My pleasure.
That corresponds to a step response, so I would just use the fft of the output.
Also, the fft documentation I linked to in my original Answer is to the R2015a version, and easier to understand and use than the current version of the documentation.
Justine Nyakundi
on 18 Jul 2017
Edited: Justine Nyakundi
on 18 Jul 2017
depends on your application. But personally I have used Gaussian white noise with a mean of zero to find FRF. But really it depends on what you gonna use the FRF for, and if you know what causes the acceleration, in my case it was random excitation of a beam. there is a MATLAB function for that just check wgn on help
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