Dual clearance squeeze film damper

摘要

This invention relates to a dual clearance hydrodynamic liquid squeeze film damper for a gas turbine engine. Under normal operating conditions the device functions as a conventional squeeze film damper, using only one of its oil films. When an unbalance reaches abusive levels, as may occur with a blade loss or foreign object damage, a second, larger- clearance film becomes active, controlling vibration amplitudes in a near- optimum manner until the engine can be safely shut down and repaired.