Oil-film instability is a common vibration fault in large turbo generator units

will cause significant effect on the safe operation of unit.By investigation on oil-film instability vibration fault cases in domestic turbine generator units in recent years

the vibration features of oil film instability were summarized.The bearing disturbance caused by improper bearing elevation and die misalignment

and the wrong bearing type were considered as the major reasons.Thus

the countermeasures were put forward

which providing technical references for the similar fault in future.