izvorni znanstveni rad
In this paper, the noise and vibration test of a new and moderately worn single row tapered roller bearing with label 32211 was carried out on a simulator, under the load of the bearing by the weight of the bearing inner ring and cage with conical rolling bodies, at a rotation speed of 945 rpm. The bearing noise test was performed by recording a noise level in the frequency interval from 20 Hz to 20 kHz with a microphone connected to a computer and by analysing the frequency spectrum in the computer program Audacity. The vibration test was conducted with a Schut VM-6360 vibrometer
by measuring acceleration and vibration frequency. The wear analysis of the bearing outer ring surface was conducted with a USB microscope with a Digimicro Profi camera. When comparing the acoustic record and vibration parameters of a new and moderately worn bearing, the appearance of additional sounds at lower frequencies in the case of a worn bearing has been observed, which are not present in the spectrogram of a new bearing. In the vibration test, a higher vibration acceleration of the worn bearing appeared compared to the new bearing. Tribological analysis revealed pitting on the outer ring of the worn bearing due to surface fatigue and traces of sliding of rolling bodies. The results of the tribological analysis confirmed the bearing damage that was predicted by the acoustic and vibration analysis.
single row tapered roller bearing; vibration analysis; sound analysis; surface fatique
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