Determination of a large tilting pad thrust bearing angular stiffness

A finite difference procedure to solve the Reynolds' and energy equations for the pressure and temperature distribution across the film is described. The film temperature takes viscosity variation and hot oil carryover into consideration. A coupled finite element method using ANSYS determines t...

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Bibliographic Details
Published in:Tribology international 2012-03, Vol.47, p.69-76
Main Authors: Srikanth, D.V., Chaturvedi, Kaushal K., Reddy, A. Chenna Kesava
Format: Article
Language:English
Subjects:
Applied sciences
Asymptotic properties
Bearing
Bearings
Bearings, bushings, rolling bearings
Deformation
Drives
Dynamic tests
Exact sciences and technology
Friction, wear, lubrication
Hydrodynamic lubrication
Interpolation
Machine components
Mathematical analysis
Mechanical engineering. Machine design
Simulation
Stiffness
Thrust bearings
Tribology
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Summary:A finite difference procedure to solve the Reynolds' and energy equations for the pressure and temperature distribution across the film is described. The film temperature takes viscosity variation and hot oil carryover into consideration. A coupled finite element method using ANSYS determines the important pad deformation. Torques for pad positions 1and 2 are calculated. The angular stiffness pertaining to the 2–1 pair is calculated for 0.5–20% variation of ho. The values of Kt⁎ converge asymptotically. The novel interpolation of a single pad's angular stiffness results to determine the characteristics of the bearing are highlighted. Unlike in earlier studies this analysis is helpful in understanding the factors causing pad flutter and dynamics of the bearing elements in hydrogenerators. ► FDM Reynolds' and energy equation solutions. ► Coupled FEM solution of pad thermo-structural deformation. ► Analysis of angular stiffness coefficients, dynamics and causes of pad flutter. ► Differs with earlier studies in the analysis of the oil film subjected to thrust segment flutter. ► Added to the linear stiffness and damping reference, study of angular stiffness and damping is done.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2011.10.017