Extract natural frequencies from acceleration data by FFT
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Hi all,
I have problems when calculating frequencies from sample data by FFT in Matlab. The data file shows acceleration in cm/s^2. Sampling frequency is 200 Hz. The file can be downloaded here: http://ifile.it/pqdvhwx. Can you please share a Matlab code for this?
Answers (2)
Bjorn Gustavsson
on 29 Jul 2011
At the matlab command line prompt type: help spectrogram
2 Comments
Bjorn Gustavsson
on 29 Jul 2011
Ok, but it would only take you about 30 s to test wouldn't it? I happen to have used that very function to find natural frequencies for sampled signals - as far as I understan this is the first stab-function to use for this purpose - especially if one expects that the dominating frequencies varies.
medo_sk
on 29 Jul 2011
4 Comments
Arnaud Miege
on 1 Aug 2011
Thanks for formatting your answer, much appreciated!! Can you post the code you are using to compute the FFT of your data?
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