Is it possible from time domain convert to ωt (x-axis) ?
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I have pressure data and date time in harmonic waveform (image attached)
then by FFT analysis, I obtained the phase difference (radians and degrees), and the amplitude ratio
is it possible to plot ωt on the x-axis?
I can't find an article that discusses something similar.
Does anyone know it?
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Mathieu NOE
2022 年 8 月 22 日
hello
I am a bit surprised how you would compare the 3 signals that have different frequencies (so non constant phase difference ) ?
回答 (1 件)
Walter Roberson
2022 年 8 月 27 日
ω has units of cycles per second. t has units of seconds (typically).
would therefore have units of cycles per second times seconds = cycles. I am having difficult figuring out what that would even mean and what the y axes would be.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1109250/image.png)
I can think of one way that might maybe be relevant. Instead of plotting with
as the x axes, you could do a short-time fft (sfft) and plot the frequencies along the y axes and the time along the x axes and the values represented in the z axes (perhaps as color.) In other words, you might create a spectrogram
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1109255/image.png)
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