Rotating equipment requires damping to control vibrations and prevent them from damaging the rotor, bearings and other components.
While fluid film bearings provide a significant amount of damping, it may not be sufficient for all rotating machinery. An additional means of increasing “effective” damping may be needed.
A squeeze film damper is a layer of film between the bearing and the housing that softens the bearing support to increase damping effectiveness. This film is in addition to the hydrodynamic film between the bearing and the shaft.