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

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％ compute the forward/backward Campbell/specgtrogram

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％ INPUT:

％ y (n x 2) each column is measured from a different sensor

％ ///////

％ __

％ |s1| y(:,1)

％ |__|

％ __

％ / \\ ________|/

％ | | | s2 |/ y(:,2)

％ \\____/ --------|/

％

％ Fs Sampling frequnecy

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％ OUTPUT:

％ B spectrogram/Campbel diagram

％ x x-axis coordinate vector (time or Speed)

％ y y-axis coordinate vector (frequency [Hz])

-an experience a elliptica l motion called whirl. It is important to decomp Rose this motion into a forward and backward whil orbits. The current function makes use of two se nsors to generate a bi-directional spectrogra m. The method can be extended to any time-freque ncy distribution% compute the forward / backw ard Campbell / specgtrogram% INPUT : % y (n x 2) each column is measured from a differen t sensor ///////%%% __ | s1 | y (:, 1)% | __ |%% __ / \\ ________|/% | | | s2 | / y (:, 2)% \\ ___/_____/20__ --------|/% Fs Sampling frequnecy %% OUTPUT : spectrogram% B / Campbel diagram% x x-axis coor dinate vector (time or Speed)% y y-axis coordin ate vector (frequency [Hz])