The gas film stiffness and damping coefficients for a non-contacting gas face seal are obtained from the unsteady nonlinear Reynolds equation using the perturbation method. The seal assembly is converted to an equivalent spring-damper-mass system. The stator tracking motion is treated as a forced vibration caused by the rotor motion due to its runout and misalignment. The seal steady-state dynamic responses are solved semianalytically. Results for a typical spiral groove gas face seal agree well with that from a full numerical simulation. Stability of the seal axial pulsating and conical whirl are examined using the frequency dependent dynamic force and moment coefficients.
Issue Section:
Technical Papers
Topics:
Damping,
Rotors,
Stability,
Stators,
Stiffness,
Steady state,
Equations of motion,
Computer simulation,
Dampers
1.
Miller
, B. A.
, and Green
, I.
, 2000
, “Numerical Formulation for the Dynamic Analysis of Spiral-Grooved Gas Face Seal
,” ASME J. Tribol.
, 123
, pp. 395
–403
.2.
Malanoski
, S. B.
, and Pan
, C. H. T.
, 1965
, “The Static and Dynamic Characteristics of the Spiral-Grooved Thrust Bearing
,” ASME J. Basic Eng.
, 87
, pp. 547
–558
.3.
Zirkelback
, N.
, and San Andre´s
, L.
, 1999
, “Effect of Frequency Excitation on Force Coefficients of Spiral Groove Gas Seals
,” ASME J. Tribol.
, 121
, pp. 853
–863
.4.
Peng
, J.-P.
, and Carpino
, M.
, 1993
, “Calculation of Stiffness and Damping Coefficients for Elastically Supported Gas Foil Bearings
,” ASME J. Tribol.
, 115
, pp. 20
–27
.5.
Jang
, G. H.
, and Kim
, Y. J.
, 1999
, “Calculation of Dynamic Coefficients in a Hydrodynamic Bearing Considering Five Degrees of Freedom for a General Rotor-Bearing System
,” ASME J. Tribol.
, 121
, pp. 499
–505
.6.
Miller
, B. A.
, and Green
, I.
, 1999
, “The Dynamic Properties of Annular Gas Squeeze Film Dampers
,” Tribol. Trans.
, 43
, pp. 302
–310
.7.
Ruan
, B.
, 2000
, “Finite Element Analysis of the Spiral Groove Gas Face Seal at the Slow Speed and the Low Pressure Conditions—Slip Flow Consideration
,” Tribol. Trans.
, 43
, pp. 411
–418
.8.
Green
, I.
, and Etsion
, I.
, 1985
, “Stability Threshold and Steady-State Response of Noncontacting Coned-Face Seals
,” ASLE Trans.
, 28
, pp. 449
–460
.Copyright © 2002
by ASME
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