Experimentally derived damping and inertia force coefficients from a test squeeze film damper for various dynamic load conditions are reported. Shakers exert single frequency loads and induce circular and elliptical orbits of increasing amplitudes. Measurements of the applied loads, bearing displacements and accelerations permit the identification of force coefficients for operation at three whirl frequencies (40, 50, and 60 Hz) and increasing lubricant temperatures. Measurements of film pressures reveal an early onset of air ingestion. Identified damping force coefficients agree well with predictions based on the short length bearing model only if an effective damper length is used. A published two-phase flow model for air entrainment allows the prediction of the effective damper length, and which ranges from 82% to 78% of the damper physical length as the whirl excitation frequency increases. Justifications for the effective length or reduced (flow) viscosity follow from the small through flow rate, not large enough to offset the dynamic volume changes. The measurements and analysis thus show the pervasiveness of air entrainment, whose effect increases with the amplitude and frequency of the dynamic journal motions. Identified inertia coefficients are approximately twice as large as those derived from classical theory.
Forced Response of a Squeeze Film Damper and Identification of Force Coefficients From Large Orbital Motions
Contributed by the Tribology Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for presentation at the STLE/ASME Joint International Tribology Conference, Ponte Vedra, FL October 26–29, 2003. Manuscript received by the Tribology Division February 12, 2003; revised manuscript received July 1, 2003. Associate Editor: M. Fillon.
- Views Icon Views
- Share Icon Share
- Search Site
San Andre´s, L., and De Santiago, O. (April 19, 2004). "Forced Response of a Squeeze Film Damper and Identification of Force Coefficients From Large Orbital Motions ." ASME. J. Tribol. April 2004; 126(2): 292–300. https://doi.org/10.1115/1.1611503
Download citation file: