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A Dynamic Analysis of Hydrodynamic Wave Journal BearingsThe purpose of this paper is to study the dynamic behavior of a three-wave journal bearing using a transient approach. The transient analysis permits the determination of the rotor behavior after the fractional frequency whirl appears. The journal trajectory is determined by solving a set of nonlinear equations of motion using the Runge-Katta method. The fluid film forces are computed by integrating the transient Reynolds equation at each time step location of the shaft with respect to the bearing. Because of the large values of the rotational speeds, turbulent effects were included in the computations. The influence of the temperature on the viscosity was also considered. Numerical results were compared to experimenta1 results obtained at the NASA Glenn Research Center. Comparisons of the theoretical results with experimental data were found to be in good agreement. The numerical and experimental results showed that the fluid film of a three-wave journal bearing having a diameter of 30 mm, a length of 27 mm, and a wave amplitude ratio greater than 0.15 is stable even at rotational speeds of 60,000 RPM. For lower wave amplitude ratios, the threshold speed at which the fluid film becomes unstable depends on the wave amplitude and on the supply pocket pressure. Even if the fluid film is unstable, the wave bearing maintains the whirl orbit inside the bearing clearance.
Document ID
20080023391
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
Authors
Ene, Nicoleta M.
(Toledo Univ. Toledo, OH, United States)
Dimofte, Florin
(NASA Glenn Research Center Cleveland, OH, United States)
Keith, Theo G.
(Toledo Univ. Toledo, OH, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Publication Information
Publication: Tribology Transactions
Volume: 51
ISSN: 1040-2004/1547-357X
Subject Category
Fluid Mechanics And Thermodynamics
Funding Number(s)
CONTRACT_GRANT: NNC06AA06A
Distribution Limits
Public
Copyright
Other

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