The lowfrequency vibration concerning shafting of steamturbine generator sets isn't certainly induced by losing stability of the shafting

the mechanism

phenomenon

and response frequencyspecturm characteristics of lowfrequency vibration component induced by oilfilm whirling

oilfilm oscilation

steamflow exciting vibration

collision between movable and stationary parts

as well as by unbalance have been summarized up

giving key points of faut diagnosis in the field

some fault diagnosis and remedial examples of lowfrequency vibration for shafting of steamturbine generator sets being also presented.