Method and apparatus for determining resonance information

G - Physics – 01 – H

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G01H 17/00 (2006.01) G01H 1/00 (2006.01)

Patent

CA 2193628

The present invention is a method and system for accurately analyzing shaft encoder signals from rotating machines. The invention reduces noise and other interferences in the encoder signals by novel means that yield an unprecedented power for extracting useful information. Signal distortion due to variation in the rotation rate of the machinery and due to FFT leakage are eliminated by acquiring digital values of the encoder signals at a set of discrete times that are determined by the properly averaged rotation rate of the shaft and requiring a fixed integer number of these discrete times per rotation of the shaft. Amplitude modulation is eliminated by proper spectral combination of left and right sidebands of the main encoder signal. Additive noise is removed by multiplying sidebands and averaging the results over a number of data records.

L'invention porte sur un procédé et un système permettant d'analyser avec précision les signaux des codeurs de machines tournantes et réduisant le bruit et les autres interférences présents dans les signaux de codage à l'aide de nouveaux moyens d'extraction d'informations utiles d'une puissance sans précédent. La distorsion des signaux résultant des fluctuations du régime de la machine et des "fuites" relatives aux transformées rapides de Fourier sont éliminées en recueillant les valeurs numériques des signaux de codage à des instants discrets fonction de la vitesse moyenne de rotation de l'arbre à raison d'un nombre entier constant d'entiers par tour. La modulation d'amplitude est éliminée par une combinaison spectrale adéquate des bandes latérales de droite et de gauche du signal principal de codage. Le bruit additionnel est éliminé en multipliant les bandes latérales et en moyennant les résultats de plusieurs enregistrements de données.

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