TRC-SFD-1-07 - Tribology Group - Texas A&M University

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IV Parameter identificationIV.1 Experimental procedureThe system is excited with single frequency loads ensuing circular centered orbits ofthe test element. The tests include four motion amplitudes (25 μm to 50 μm) atfrequencies ranging from 20 Hz to 70 Hz. The excitation load amplitudes are adjustedthroughout the test frequency range to maintain constant amplitude circular orbits (25 μm,31μm, 38 μm, 50 μm). The tests conditions are similar to those in Ref. [3] to allow directcomparisons of the end results. Table 1 presents the test conditions and lubricantproperties. Figures 5 and 6 show the recorded displacement orbits for two selectedfrequencies (20 and 60 Hz).Table 1 Test conditions for dynamic load tests (CCO). Lubricated <strong>SFD</strong>Inlet Pressure (P s ) *31 kPaDischarge groove pressure (P r )* 8.6 kPa-15.5 kPaFrequency Range20-70 Hz (5 Hz step)Lubricant temperature (T) 23-25 0 C (73-77 0 F)Viscosity (η)3.1 cP- 2.8 cPClearance (c)125-127 μm (4.9-5 mil)Orbit amplitude (e)25-50 μm (1-2 mil)*: Gauge pressure. **: no thru-flow.14
300Y Load [N](90 N,82 N)(98 N,88 N)(105 N,95 N)150− 300 − 1500 150 300(127 N,113 N)− 150− 300X Load [N]130Max. clearance:127 μmY displacement [um]25 μm31 μm38 μm65− 130 − 650 65 13050 μm− 65− 13020 HzX displacement [um]Figure 5 Recorded load and ensuing displacement orbits for four amplitude loadmagnitudes. Clearance circle noted. (20 Hz, lubricated <strong>SFD</strong>, CCO)15
Page 1 and 2: Texas A&M UniversityMechanical Engi
Page 3 and 4: Table of ContentsExecutive Summary.
Page 5 and 6: Figure 22 Dynamic pressure measurem
Page 7 and 8: I IntroductionSqueeze film dampers
Page 9 and 10: A review of publications related to
Page 11 and 12: III Test Rig DescriptionFigure 1 de
Page 13: Oil inletEddy current sensorHousing
Page 17 and 18: M sM fK sxC SFDxxC SFDyyF djournalF
Page 19 and 20: 2( ω−ω− )F = L x + F u ; L =
Page 21: configurations including open outle
Page 24 and 25: capacity of 4.1 kJ. In actual appli
Page 26 and 27: V Onset amplitude and frequency lea
Page 28 and 29: Figure 14 Excitation load and respo
Page 30 and 31: V.2 Experimental ResultsFigure 17 s
Page 32 and 33: 1.5Pk-Pk Pressure (bar)10.532 μm50
Page 34 and 35: Absolute Pressure [bar]24001.75Pres
Page 36 and 37: VI Conclusions and RecommendationsT
Page 38 and 39: VII References[1] Delgado, A., and
Page 40 and 41: Appendix A Identification of dry fr

TRC-SFD-1-07 - Tribology Group - Texas A&M University

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