Condition based monitoring of bearing by vibrational analysis

Details Condition based monitoring of bearing by vibrational analysis Condition based monitoring of bearing by vibrational analysis

G - Physics

01

M

G01M 13/02 (2006.01)

Patent

CA 2374748

An apparatus and method monitors the conditions of a bearing/shaft assembly (10, 12) by forming diagnostics based on spectral analysis of assembly's vibration. Baseline parameters are determined by a microprocessor analysis of the vibration spectra, comparing actual peaks to the peaks predicted by a model. The microprocessor (34) estimates rotation rate and preferably number of rolling elements by attempting to fit the model to the actual vibrational spectrum, by varying the assumptions. Baseline profiles are formed from one or more selected tones and preferably also harmonics thereof, to characterize the bearing/shaft assembly. The baseline profiles and parameters are compared against later acquired vibrational characteristics, and the comparison is used to diagnose bearing and/or shaft conditions.

La présente invention concerne un appareil et un procédé qui surveillent l'état d'un ensemble roulement/arbre (10, 12) par l'établissement d'un diagnostic fondé sur l'analyse spectrale de vibrations de l'ensemble. Les paramètres de base sont déterminés par une analyse de microprocesseur du spectre des vibrations, par comparaison des crêtes réelles et des crêtes prévues par un modèle. Ce microprocesseur (34) évalue le taux de rotation et de préférence un certain nombre d'éléments roulants en essayant d'adapter le modèle au spectre des vibrations réel par des variations d'hypothèses. Les profils de base sont élaborés à partir d'une ou de plusieurs fréquences et de préférence à partir d'harmoniques de celles-ci, de façon à caractériser cet ensemble roulement/arbre. On compare ces profils de base et les paramètres aux dernières caractéristiques des vibrations acquises, et on utilise cette comparaison pour établir un diagnostic de l'état du roulement et/ou de l'arbre.

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