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

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Figure 7 Schematic view of the equivalent representation of the SFD with mechanicalseal ............................................................................................................................ 17Figure 8 Elements of a four-input/two output representation of the non-linear mechanicalseal-SFD system [16]................................................................................................ 18Figure 9 Dry friction force identified from circular centered orbits. Dotted line representsdry friction estimated from energy method and tests under dry conditions. ............ 21Figure 10 Real part of dynamic stiffnesses versus frequency. Circular centered orbits ofamplitude x,y: 50 μm (K sx = 853 kN/m, K sy = 885 kN/m.) ......................................... 22Figure 11 Imaginary part of linear impedance function versus excitation frequency.(C SFDxx ) Circular centered orbits of amplitude x,y: 50 μm ( no thru-flow) ............. 23Figure 12 Squeeze film damping coefficient (C SFDyy ) versus orbit amplitude. (CircularCentered Orbits, No thru-flow, flow restrictor: 2.8 mm [3]) .................................... 24Figure 13 Squeeze film damping coefficients (C SFDxx, C SFDyy ) and system dampingcoefficients (C s-xx, C s-yy ) versus excitation frequency for increasing orbit amplitudes.(Circular Centered Orbits, No thru-flow) ................................................................. 25Figure 14 Excitation load and response orbits (motion) from experimental data. (110 Hz,Load: [N], displacement [μm], 32 μm)..................................................................... 28Figure 15 Excitation load and response orbits (motion) from experimental data. (90 Hz,Load: [N], displacement [μm], 50 μm)..................................................................... 28Figure 16 Excitation load and response orbits (motion) from experimental data. (50 Hz,Load: [N], displacement [μm], 74 μm)..................................................................... 29Figure 17 Cut view of SFD housing detailing the location of pressure sensors............... 30Figure 18 Pk-pk dynamic pressures in squeeze film land versus frequency and variousorbit amplitudes. ....................................................................................................... 31Figure 19 Pk-pk dynamic pressures in discharge groove versus frequency and variousorbit amplitudes. ....................................................................................................... 32Figure 20 Dynamic pressure measurements at SFD land and discharge groove (includingfilm thickness at sensor location). (100 Hz, 32 μm orbit amplitude, supply pressure=31 kPa, no thru-flow) ................................................................................................ 33Figure 21 Dynamic pressure measurements at SFD land and discharge groove (includingfilm thickness at sensor location). (90 Hz, 50 μm orbit amplitude, supply pressure=31 kPa, no thru-flow) ................................................................................................ 334
Figure 22 Dynamic pressure measurements at SFD land and discharge groove (includingfilm thickness at sensor location). (60 Hz, 62 μm orbit amplitude, supply pressure=31 kPa, no thru-flow) ................................................................................................ 34Figure 23 Dynamic pressure measurements at SFD land and discharge groove(including film thickness at sensor location). (50 Hz, 74 μm orbit amplitude, supplypressure= 31 kPa, no thru-flow)................................................................................ 34Figure 24 Cut view of SFD detailing alternative paths for air ingestion.......................... 355
Page 1 and 2: Texas A&M UniversityMechanical Engi
Page 3: Table of ContentsExecutive Summary.
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 and 14: Oil inletEddy current sensorHousing
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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