Method for contactless measuring of vibrations of a rotating...

Details Method for contactless measuring of vibrations of a rotating... Method for contactless measuring of vibrations of a rotating...

G - Physics

01

H

G01H 1/00 (2006.01)

Patent

CA 2376431

The invention concerns a method whereby immobile sensors (C1 to C8) are used to measure periodically the vibrating motions of portions (2) of a body (3) rotating in front of them, such as blades, and determine their self-resonant frequencies by spectrum analysis. The invention is characterised in that the sensors are assembled into several arrays in different number and the determination consists in comparing the spectra of the different arrays by various operations selecting and rejecting rays. The method enables to substantially improve unambiguous detection of frequencies by extending the limits thereof.

On recourt à des capteurs immobiles (C1 à C8) pour mesurer périodiquement les mouvements vibratoires de portions (2) d'un corps (3) tournant devant eux, telles que des aubes, et rechercher leurs fréquences propres par des analyses de spectres. Conformément à l'invention, les capteurs sont regroupés en plusieurs réseaux de nombres différents et la recherche consiste en une comparaison des spectres des différents réseaux par diverses opérations de sélection et de rejet de raies. Le procédé repousse sensiblement la limite de détection sans ambiguïté des fréquences.

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