How can I convert deformation data into FRF using FFT?

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I have deformation data. (unit: mm) (Time domain)
Then, I want to obtain FRF data using FFT.
As follow.
How can I convert deformation data into FRF using FFT?

Accepted Answer

Bjorn Gustavsson
Bjorn Gustavsson on 27 Oct 2021
Simply use fft? That will give you the complex discrete Fourier-transform. If you do:
fS = fft(S); % fS will have "DC"-component in the first element
semilogy(2*abs(fS(1:end/2)))
You'll have to determine the frequencies and whether you want abs(fS) or abs(fS).^2.
HTH

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