The Diagnostics of Roller Bearings Using the Phase-Chronometric Method

This paper is prompted by the wide use of roller bearings in machines and mechanisms and the necessity to further develop efficient methods and diagnostic tools for bearing assemblies under operation. Vibroacoustic and electroparametric methods of diagnostics account for about 60% of innovations. The use of the phase-chronometric method for diagnostics and emergency protection of roller bearings in operation is studied in the paper. This method provides information-metrological support of the bearing throughout its life cycle using the unified format of the measured data (time intervals) and measurement instruments. The diagram of parameter measurement and the design of the phase-chronometric system are shown. Using mathematical analysis of the obtained series of time intervals, the characteristics pertaining to the operation of roller bearings and describing their phase-chronometric features are determined. A mathematical model in the phase-chronometric formulation based on the theory of machines and mechanisms is used to link the results of the time interval measurements with the design of roller bearings and emerging defects. The calculation results that demonstrate the possibility of modelling defects and developing their classification at the design stage of roller bearings are presented.  The authors assess the possibility of performing diagnostics of the bearing when data is obtained only from the shaft of the rotating ring.

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