Adams Basic Package > Adams View > Adams View > Dialog box - F1 help > E - I > Fast Fourier Transform (FFT)

Fast Fourier Transform (FFT)

Edit → Plot → FFT
Constructs a two-dimensional Fast fourier transform (FFT) plot.
You can either determine the magnitude (Mag), the phase (Phase), or determine the power spectral density (PSD) based on Welch's method.
 
For the option:
Do the following:
Curve Name
Displays the name of the curve you are plotting.
Y-Axis
Select one of the following:
■Mag
■PSD
Start Time
Enter the start time on the curve for which you want the signal processing performed.
End Time
Enter the end time on the curve for which you want the signal processing performed.
Window Type
Select the type of window type you want to use. Learn more about the window functions.
Points/Points (Power of 2)
Select the number of points to be used for the FFT.
The following option is only available if you selected Mag or Phase.
Detrend Input Data
Select if you want to detrend the signal. This subtracts the linear least square fit from the data stream.
The following options are only available if you selected PSD.
Number of Segments/Segment Length
Enter the number of segments, which means that the signal will be split in that many segments of equal length (window length).
Or, you can enter the segment length directly. This is often referred to as the window length. A recommended number of segments is 8, with 50% overlap (see Overlap Points) between segments.
Overlap Points
Enter the number of overlaps, which indicates how many signal samples are used. With a 50% segment overlap and 8 segments as a recommendation, this number would be Points (Power of 2) / (8*2).
Add Curves
Select to plot multiple curves selected in the Curve Name field.
Clear Plot
Select to clear the FFT Window plot.