Predictive rolling bearing maintenance

摘要

A method of predicting a fault in a rolling bearing, the rolling bearing including inner and outer rings and rolling bodies evenly angularly distributed therebetween, the method comprising: processing (in the DSP system 8) a position signal (x(t)) indicative of a relative angular position of the inner ring with respect to the outer rings, and a vibration signal (y(t)) (by the accelerometer 7) indicative of speed-related vibrations in the rolling bearing, such that they correspond to either an angular displacement of the rolling bodies equal to an integer number of angular gaps between adjacent rolling bodies or an integer number of complete rotations of the inner ring with respect to the outer ring; space sampling (in the ND acquisition board 9) the processed vibration signal (y(t)) based on the processed position signal (x(t)); and predicting a fault in the rolling bearing based on the space-sampled vibration signal (y(t)).

主权项

1. A method of predicting a fault in a rolling bearing, the rolling bearing including inner and outer rings and rolling bodies evenly angularly distributed therebetween, the method comprising:
processing a position signal indicative of a relative angular position of the inner ring with respect to the outer ring, and a vibration signal indicative of speed-related vibrations in the rolling bearing, such that they correspond to either an angular displacement of the rolling bodies equal to an integer number of angular gaps between adjacent rolling bodies or an integer number of complete rotations of the inner ring with respect to the outer ring, the processing being performed by a digital signal processor; space sampling the processed vibration signal based on the processed position signal; predicting a fault in the rolling bearing based on the space-sampled vibration signal; wherein the rolling bearing is operated to cyclically reverse relative rotation direction of the inner ring with respect to the outer ring, and during the cyclical reversal of the relative rotation direction of the inner ring with respect to the outer ring, the processing of the position and vibration signals includes: processing the position and vibration signals such that they correspond, in each operating cycle, to either an angular displacement of the rolling bodies equal to an integer number of angular gaps between adjacent rolling bodies or an integer number of complete rotations of the inner ring with respect to the outer ring; and processing the space-sampled vibration signal obtained during the cyclically reversed relative rotation direction of the inner ring with respect to the outer ring such that it corresponds to a continuous rotation of the inner ring with respect to the outer ring in one and the same direction and at a constant speed.