“Design of An Oil Squeeze Film Damper Bearing For a Multimass Rotor Bearing System,”
R. E. Cunningham, E. J. Gunter & D. P. Fleming, 1975.


Results of a single-mass flexible-rotor analysis were used to optimize the stiffness and damping of a flexible, damped support for a symmetric five-mass rotor operating through and above its first bending critical speed. The flexible support attenuates the rotor amplitudes and forces transmitted to the ball bearings.

The stiffness and damping values obtained from the single-mass analysis were then used in the design of an oil squeeze-film damper and its centering spring. Short bearing lubrication theory was used. A cavitated oil film was assumed to exist in the nonrotating damper journal.

The damper design was verified by an unbalance response computer program. At the first critical speed, rotor amplitudes were reduced by a factor of 16 and bearing loads reduced by a factor of 36 compared with the same rotor with rigidly supported bearings. Amplitudes and forces at higher speeds were also reduced substantially.