Determination of rolling element bearing condition via acoustic emission
Determination of rolling element bearing condition via acoustic emission
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DOI：
10.1177/1350650116638612
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发表时间：
2016-11-01
影响因子：
2
通讯作者：
Holford, K. M.
中科院分区：
文献类型：
--
作者：
Cockerill, A.;Clarke, A.;Holford, K. M.
声发射是一种新兴的滚动轴承状态监测技术，具有在故障早期检测早期损伤的潜在优势。在这种技术可以应用于健康监测的信心，它是至关重要的，以了解声发射产生的健康轴承的工作条件的变化。本文研究了提高速度和载荷对圆柱滚子轴承内声发射产生的影响，发现均方根信号水平随速度的增加而显著增加，而增加载荷的影响要小得多。将每个实验的AE（RMS）值与λ值的趋势进行比较。轴承在全膜润滑状态下运行，因此确定AE（RMS）的增加不是由粗糙接触引起的。通过考虑频率能量振幅的趋势，确定轴承共振频率的激励是导致20-60 kHz频率范围内能量增加的原因。在330 kHz（声发射传感器的谐振频率）处的激发能量随着负载而增加，表明高频发射与接触区的应力之间存在联系。在正常操作条件下表征轴承后，进行了加速寿命试验，以诱导疲劳失效。频率响应表明，在整个恒定磨损期间，轴承共振频率处的能量振幅随时间增加。随着轴承失效变得更加显著，100 kHz以上的高频分量的能量分布在更宽的频率范围内，因为多个瞬时能量爆发通过滚道的疲劳失效同时释放。本文展示了声发射的潜力，提供了一个洞察轴承的行为下正常运行，并提供轴承故障的早期迹象。
Acoustic emission is an emerging technique for condition monitoring of rolling element bearings and potentially offers advantages for detection of incipient damage at an early stage of failure. Before such a technique can be applied with confidence for health monitoring, it is vital to understand the variation of acoustic emission generation with operating conditions in a healthy bearing. This paper investigates the effects of increased speed and load on the generation of acoustic emission within cylindrical roller bearings, and it was found that the root mean square signal level increased significantly with increasing speed whereas increasing load had a far weaker effect. The AE(RMS) value for each experiment was compared with the trend of the Lambda value. The bearing was operating under full film lubrication regime, so it was determined that increases in AE(RMS) were not caused by asperity contact. By consideration of trends in frequency energy amplitude, it was determined that excitation of the bearings resonant frequencies were responsible for an increase of energy in the frequency range of 20-60 kHz. The excitation energy at 330kHz (the acoustic emission sensor's resonant frequency) increased with load, indicating a link between high-frequency emission and stress at the contact zone. Following characterisation of the bearing under normal operating conditions, an accelerated life test was conducted in order to induce fatigue failure. The frequency response demonstrated that throughout a period of constant wear, the energy amplitude at the bearings resonant frequency increased with time. As the bearing failure became more significant, the energy of the high-frequency components above 100 kHz was spread over a broader frequency range as multiple transient bursts of energy were released simultaneously by fatigue failure of the raceways. This paper demonstrates the potential of acoustic emission to provide an insight into the bearing's behaviour under normal operation and provide early indication of bearing failure.