In rotor-bearing systems, squeeze film dampers (SFDs) provide structural isolation, reduce amplitudes of rotor response to imbalance, and in some instances, increase the system threshold speed of instability. SFDs are typically installed at the bearing supports, either in series or in parallel. In multispool engines, SFDs are located in the interface between rotating shafts. These intershaft dampers must ameliorate complex rotor motions of various whirl frequencies arising from the low speed and the high speed rotors. The paper presents experiments to characterize the forced response of an open ends SFD subject to dynamic loads with multiple frequencies, as in a jet engine intershaft damper. The test rig comprises of a stationary journal and a flexibly supported housing that holds the test damper and instrumentation. The open ends SFD is 127 mm in diameter, 25.4 mm film land length, and has a radial clearance of 0.125 mm. The damper is lubricated with ISO VG 2 oil at room temperature (, feed pressure 31 kPa). In the experiments, two orthogonally positioned shakers deliver forces to the test damper that produce controlled amplitude motions with two whirl frequencies, one fixed and the other one varying over a specified range that includes the test system natural frequency. The test data collected, forces and motions versus time, are converted into the frequency domain for parameter identification. The identified viscous damping coefficients are strong functions of the amplitude of journal motion, lying within predictions from classical formulas for circular centered orbits and small amplitude motions about an eccentric journal position. The damper inertia coefficients agree well with predictions derived from a fluid flow model that includes the effect of the feed groove.
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e-mail: delgadoa@ge.com
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April 2010
Research Papers
Identification of Squeeze Film Damper Force Coefficients From Multiple-Frequency Noncircular Journal Motions
Adolfo Delgado,
Adolfo Delgado
Department of Mechanical Engineering.
e-mail: delgadoa@ge.com
Texas A&M University
, College Station, TX 77843
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Luis San Andrés
Luis San Andrés
Mast-Childs Professor
Fellow ASME
Department of Mechanical Engineering.
e-mail: lsanandres@tamu.edu
Texas A&M University
, College Station, TX 77843
Search for other works by this author on:
Adolfo Delgado
Department of Mechanical Engineering.
Texas A&M University
, College Station, TX 77843e-mail: delgadoa@ge.com
Luis San Andrés
Mast-Childs Professor
Fellow ASME
Department of Mechanical Engineering.
Texas A&M University
, College Station, TX 77843e-mail: lsanandres@tamu.edu
J. Eng. Gas Turbines Power. Apr 2010, 132(4): 042501 (9 pages)
Published Online: January 22, 2010
Article history
Received:
March 22, 2009
Revised:
March 29, 2009
Online:
January 22, 2010
Published:
January 22, 2010
Citation
Delgado, A., and San Andrés, L. (January 22, 2010). "Identification of Squeeze Film Damper Force Coefficients From Multiple-Frequency Noncircular Journal Motions." ASME. J. Eng. Gas Turbines Power. April 2010; 132(4): 042501. https://doi.org/10.1115/1.3159374
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