What are the critical failure modes of a hydro-generator's bearings?

Critical failure modes of hydro-generator bearings include fatigue failure, lubrication failure, contamination, and excessive vibration. Fatigue failure occurs when the bearing material experiences repeated stress cycles, leading to crack initiation and propagation, eventually resulting in spalling or flaking of the bearing surfaces. Lubrication failure happens when the oil film separating the bearing surfaces breaks d....