Imbalance response of a test rotor supported on squeeze film dampers

A test rig is developed to measure dynamic forced response of a 3-disk rotor supported on two cylindrical squeeze-film dampers (SFD). Measured impedance responses to 9,000 rpm due to various imbalances show the rotor-SFD system to be well damped while traversing cylindrical and conical modes critical speeds. The rotor amplitudes of motion are proportional to the imbalances for the first mode of vibration, and the damping coefficients extracted compare well to predictions based on full-film open ends SFD. Dynamic pressures at the squeeze film lands are well above ambient values with no indication of lubricant dynamic cavitation as simple theoretical models dictate. No nonlinear behavior of the rotor-SFD system was observed.

Imbalance response of a test rotor supported on squeeze film dampers Conference Paper