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

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provides a contact force between the matting surfaces to seal the damper. Figure 2 and 3depict a cross section and a cut view of the end sealed SFD design along with itscomponents, respectively. The configuration tested in [3] included four outlet ports at thedischarge groove that allowed flow of the oil across the damper. In the current test set upthese ports are sealed (i.e. no thru flow allowed).Oil inletEddycurrentsensorPlexiglasBearingVerticalplateRecirculationannulus DischargegrooveHousingTop plateO-ringsO-ringsWave springRing carrierJournalcm0 2.5 5 7.5 10Pipe PluginsertShaftDischargeorificeBottom plateFigure 2 Sealed-end SFD assembly cross section view.Figure 4 shows the instrumentation arrangement and the reference coordinate systemon the SFD housing. The instrumentation consists of two accelerometers, four Eddycurrent sensors and two load cells. The system is excited via two electromagnetic shakerssuspended from separate steel structures (90 degrees apart). Slender stingers connect theelectromagnetic shakers to the piezoelectric load cells attached to vertical plates on thebearing housing. A customized data acquisition system records all the sensor signals andcontrols the electromagnetic shakers.12
Oil inletEddy current sensorHousingtop plateNominal clearance0.005 in (0.127 mm)Plexiglas bearingJournalVerticalplateShaftRing carrierWavespringDischarge Recirculation groove annulusBottom plate2 in (50.8 mm)Figure 3 Sealed-end SFD assembly cut view.1:Accelerometers2: Load Cells3: Stingers4: Eddy currentsensor holder411XY23Figure 4 SFD housing reference coordinate system and location of sensors.13
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: III Test Rig DescriptionFigure 1 de
Page 15 and 16: 300Y Load [N](90 N,82 N)(98 N,88 N)
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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