Noninvasive method and apparatus for determining resonance...

G - Physics – 01 – M

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G01M 99/00 (2011.01) G01M 15/00 (2006.01)

Patent

CA 2192182

A method and apparatus is described for determining resonant frequencies of vibration of turbine (20) and (22) and fan shafts (16) and blades, and other rotating machines (12) in which a rotating element of the machine (12) has oscillatory vibrations that modulate the fundamental frequency of rotation of the rotating machine (12). A sensor (30) monitors the machine (12), providing a train of sensor pulses or other signal representative of angular rotation of the machine (12). The signal is processed to provide a signal representative of the modulation of the fundamental frequency of rotation of the rotating machine (12), which signal is processed to provide a frequency spectrum representative of instantaneous-frequency components present. The signal spectrum is electronically processed to provide resonance- information, spectral signals representative of frequency or amplitude characteristics, or both, for the resonant vibrations. Signal-processing methods (36) include use of Fast Fourier Transform and Discrete Fourier Transform.

L'invention concerne un procédé et un appareil pour déterminer les fréquences de résonance des vibrations d'une turbine (20 et 22), de l'arbre principal (16) et l'aubage, et d'autres machines tournantes (12), dans laquelle un élément rotatif de la machine (12) a des vibrations oscillatoires qui modulent la fréquence fondamentale de rotation de la machine tournante (12). Un détecteur (30) surveille la machine (12) et fournit un train d'impulsions ou autre signal représentatifs de la rotation angulaire de la machine (12). Le signal est traité pour fournir un signal représentatif de la modulation de la fréquence fondamentale de rotation de la machine tournante (12). Ce signal est traité pour fournir un spectre de fréquences représentatif des composantes de fréquence instantanées présentes. Le spectre du signal est traité électroniquement pour fournir des informations sur la résonance, des signaux spectraux représentatifs des caractéristiques de fréquence ou d'amplitude, ou les deux, pour les vibrations de résonance. Parmi les méthodes (36) de traitement des signaux on peut citer la transformation de Fourier rapide et la transformation de Fourier discrète.

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