Rotating shafts experience a an elliptical motion called whirl. It is important to decompose this motion into a forward and backward whil orbits. The current function makes use of two sensors to generate a bi-directional spectrogram. The method can be extended to any time-frequency distribution
% compute the forward/backward Campbell/specgtrogram
% y (n x 2) each column is measured from a different sensor
% |s1| y(:,1)
% / \ ________|/
% | | | s2 |/ y(:,2)
% \____/ --------|/
% Fs Sampling frequnecy
% B spectrogram/Campbel diagram
% x x-axis coordinate vector (time or Speed)
% y y-axis coordinate vector (frequency [Hz])
Izhak Bucher (2021). 2-sided Zmod (https://www.mathworks.com/matlabcentral/fileexchange/4091-2-sided-zmod), MATLAB Central File Exchange. Retrieved .
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