The study of dynamic whirl behavior of air bearings is fundamental for an adequate rotordynamic analysis and future validation of numerical predictions. This work shows the dynamic response of the air film on a three-lobe bearing under asynchronous whirl motion. One-dimensional multifrequency orbits are used to characterize the bearing rotordynamic coefficients. The test rig uses two magnetic bearing actuators to impose any given orbits to the journal. The dynamic forces are measured on the test bearing housing by three load cells. Journal whirling excitation is independent of the rotating speed, thus allowing asynchronous excitations. The multifrequency excitation is applied at each rotating speed up to , allowing the asynchronous characterization of the air film. The experimental procedure requires two linearly independent excitation sets. Thus, vertical and horizontal one-dimensional multifrequency orbits are applied as perturbations. Results show the synchronous and asynchronous dynamic coefficients of the air bearing. Asynchronous experimental results are compared to numerical estimation of the bearing force coefficients through solution of the isotropic ideal gas journal bearing Reynolds equation. Numerical dynamic coefficients are obtained as the effective coefficient values of the bearing when subject to a given orbit. A full characterization of the asynchronous rotordynamics coefficients of the bearing is presented in three-dimensional maps.
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September 2008
Research Papers
Asynchronous Dynamic Coefficients of a Three-Lobe Air Bearing
Rafael O. Ruiz,
Rafael O. Ruiz
Laboratorio Dinámica de Máquinas,
Universidad Simón Bolívar
, Caracas 1080-A, Venezuela
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Marcelo H. Di Liscia,
Marcelo H. Di Liscia
Laboratorio Dinámica de Máquinas,
Universidad Simón Bolívar
, Caracas 1080-A, Venezuela
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Luis U. Medina,
Luis U. Medina
Laboratorio Dinámica de Máquinas,
Universidad Simón Bolívar
, Caracas 1080-A, Venezuela
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Sergio E. Díaz
Sergio E. Díaz
Laboratorio Dinámica de Máquinas,
Universidad Simón Bolívar
, Caracas 1080-A, Venezuela
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Rafael O. Ruiz
Laboratorio Dinámica de Máquinas,
Universidad Simón Bolívar
, Caracas 1080-A, Venezuela
Marcelo H. Di Liscia
Laboratorio Dinámica de Máquinas,
Universidad Simón Bolívar
, Caracas 1080-A, Venezuela
Luis U. Medina
Laboratorio Dinámica de Máquinas,
Universidad Simón Bolívar
, Caracas 1080-A, Venezuela
Sergio E. Díaz
Laboratorio Dinámica de Máquinas,
Universidad Simón Bolívar
, Caracas 1080-A, VenezuelaJ. Eng. Gas Turbines Power. Sep 2008, 130(5): 052502 (7 pages)
Published Online: June 18, 2008
Article history
Received:
April 27, 2007
Revised:
May 7, 2007
Published:
June 18, 2008
Citation
Ruiz, R. O., Di Liscia, M. H., Medina, L. U., and Díaz, S. E. (June 18, 2008). "Asynchronous Dynamic Coefficients of a Three-Lobe Air Bearing." ASME. J. Eng. Gas Turbines Power. September 2008; 130(5): 052502. https://doi.org/10.1115/1.2772635
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