BISOPE series 91 Vibration Problem of Rolling Bearing 4 Cause of De...

BISOPE series 91- Vibration Problem of Rolling Bearing - 4 - Cause of Defect Frequency----------------------------------------------------

Rolling bearings have their own defect frequency calculation formula. This defect frequency always occurs even if it is small, but it is not exactly a natural frequency because the frequency is constant and unique, so it is not called a ‘defect’ frequency but a ‘natural’ frequency of the bearing. This is because the natural frequency actually exists somewhere else. Therefore, it seems a better expression to change the name of this defect frequency to the ‘rotational characteristic frequency’ of the rolling bearing. However, there are times when I get questions about this rolling bearing defect frequency not matching the formula. After a long period of operation and disassembly, the bearing defect is correct, but the frequency is close to it, but it is not accurate. Therefore, it is only a correct formula if the outer ring is defective (scratched) and assembled and turned right away. Since the characteristics change slightly due to thermal expansion and tapping when assembling the bearing, there is bound to be a slight error. Moreover, as time passes, the tolerance of the bearing increases and becomes looser, and the frequency also fluctuates. So how do you check for bearing defects?

 

Fault frequency mechanism of cloud bearings

 

Bearing defects are checked by the frequency or time waveform pattern. If the pattern (harmonic, sidebands) is checked, and the bearing information is not accurate and there is an error of less than 10Hz,

Keywords: Bearing vibration, rolling bearing, bearing defect, spectrum, BPFI, BPFO, inner ring defect, outer ring defect, bearing defect frequency, bearing natural frequencyMeasurement Location

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