Acoustic Response of 100 Cr 6 (SAE 52100 chrome steel) Material Ball Bearing in Experimental Oil Starvation Failure Modes

Bearing is the most active rotating element in dynamic mechanical systems. Materials which are used in rotating elements face with faster deterioration due to vibration and acoustic emissions. Frictional effect on bearing components may have different characteristics in acoustical response with respect to surface and micro-structure features. Particulary, oil starvation occurs in bearings by the time; and the material of the inner race, outer race, balls requires higher priority for preventing internal and external failures. In this study, some failure modes are experimented with a ball bearing made of 100 Cr 6 (SAE 52100 chrome steel) and evaluated with respect to the material’s acoustic response. Oil starvation single failure mode, oil starvation-horizontal misalignment double failure mode and oil starvation-unbalancehorizontal misalignment triple failure mode are studied in various levels. As rotational speed, failure amount and failure level increase; acoustic signal response and acoustic RMS intensity increase as well, which may lead to deterioration on the material of the bearing. According to the conclusion; characteristic failure signals are achieved in time-domain and frequencydomain at various rotation speeds, and also found that overall root mean square (RMS) values of the acoustic signals are in an increasing trend with respect to the energy on material deterioration. Each failure has characteristic features and they become more prominent with respect to the failure intensity in synchroneus failure modes.Keywords: steel, acoustic, oil starvation, misalignment, condition monitoring, unbalance

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