How to plot FFT in MATLAB by executing Vibration data recorded in Excel?

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Wakeel Mohammed 2021-1-3

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评论： Star Strider 2021-1-9

Hi,

I have several recorded vibration measurements in Exel files as Time vs. Acceleration. Now I need to plot Time Vs. Acc and FFT graphs for further analysis.

Thank in Advance for all put their comments and suggestions below!

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Star Strider 2021-1-3

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Use the fft function. The documentation will tell you how best to implement it for your signal.

Note that the sampling intervals must be constant, so if they are not, first use the Signal Processing Toolbox resample function to interpolate them to a constant sampling interval. Then use the fft function to calculate the spectra.

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Star Strider 2021-1-6

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The symmetry in the plot is because you are most likely plotting the complete fft results. The first half of that vector is a ‘one-sided’ Fourier transform, and the second half is the flipped complex-conjugate of the first half. It is only necessary to plot the first half in most instances. If you plot both, you will need to use the fftshift function, and then create an appropriate frequency vector with negative and positive components.

I usually use s version of this to plot a one-sided fft:

t = ...;                                            % Time Vector
s = ...;                                            % signal Vector
L = numel(t);                                       % Signal Length
Ts = mean(diff(t));                                 % Sampling Interval
Fs = 1/Ts;                                          % Sampling Frequency
Fn = Fs/2;                                          % Nyquist Frequency
FTs = fft(s)/L;                                     % Normalised Fourier Transform
Fv = linspace(0, 1, fix(L/2)+1)*Fn;                 % Frequency Vector
Iv = 1:numel(Fv);                                   % Index Vector
figure
plot(Fv, abs(FTs(Iv))*2)
grid
title('Fourier Transform')
xlabel('Frequency (units)')
ylabel('Amplitude (units)')

Wakeel Mohammed 2021-1-9

It really worked Star Strider! You have no idea how much this help worths for me. Thank you so much! Thanks a lot.

Star Strider 2021-1-9

As always, my pleasure!

I am happy that you got everything sorted!

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How to plot FFT in MATLAB by executing Vibration data recorded in Excel?

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