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Research Papers: Hydrodynamic Lubrication

The Influence of Surface Patterning on the Thermal Properties of Textured Thrust Bearings

[+] Author and Article Information
Gen Fu

Laboratory for Turbomachinery and
Components,
Department of Biomedical Engineering
and Mechanics,
Virginia Tech,
Norris Hall, Room 107, 495 Old Turner Street,
Blacksburg, VA 24061
e-mail: gen8@vt.edu

Alexandrina Untaroiu

Laboratory for Turbomachinery and
Components,
Department of Biomedical Engineering
and Mechanics, Virginia Tech,
Norris Hall, Room 324, 495 Old Turner Street,
Blacksburg, VA 24061
e-mail: alexu@vt.edu

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 13, 2017; final manuscript received May 18, 2018; published online June 13, 2018. Assoc. Editor: Alan Palazzolo.

J. Tribol 140(6), 061706 (Jun 13, 2018) (10 pages) Paper No: TRIB-17-1361; doi: 10.1115/1.4040383 History: Received September 13, 2017; Revised May 18, 2018

Contact performance can be enhanced by using textured surfaces. These are also found to have influences on lubricated contacts. A procedure to find the optimal partially textured thrust bearing configuration is presented in this study. A parallel sector-pad thrust bearing is simulated by a three-dimensional (3D) computational fluid dynamics (CFD) model. The stationary surface of the bearing is textured with dimples, while the rotor surface is flat. The results of the baseline model are validated by experimental data. In this study, we compare rectangular and elliptical dimples by investigating design parameters, such as major the length of the major axis (width), the length of the minor axis (length), dimple depth, circumferential space between two dimples, radial space between two dimples, radial extent, circumferential extent are selected as design parameters. A parametric study is conducted to investigate the influence of the texture geometries and a surrogate model is created. Based on the surrogate model, a multi-objective optimization scheme is used to navigate the design space and find the optimal texture structure that provides a lower maximal temperature inside the fluid film, higher load capacity, and lower friction torque. The results show that the optimal radial extent of the texture is around 80% of the pad radial length for both cases. The optimal length of the elliptical dimples in the circumferential direction is about 30% larger than the value of the rectangular dimples. In the final optimal design, the maximal temperature reduces 1.1% and 1.3% for rectangular and elliptical dimples while the load capacities are maintained at the same level.

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References

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Figures

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Fig. 1

The geometry of the baseline model

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Fig. 2

Boundary conditions in the CFD model: (a) rectangular and (b) elliptical

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Fig. 3

Boundary conditions in the CFD model

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Fig. 4

Pressure distribution of the baseline model: (a) rectangular dimple and (b) elliptical dimple

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Fig. 5

Temperature distribution of the baseline model: (a) rectangular dimple and (b) elliptical dimple

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Fig. 6

Goodness of fit of the response model: (a) rectangular dimple and (b) elliptical dimple

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Fig. 7

Surface response plots for bearing with rectangular dimples: (a) maximal temperature versus rθ and rwt, (b) maximal temperature versus l1 and l2, and (c) maximal temperature versus Sr and Sc

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Fig. 8

Surface response plots for bearing with elliptical dimples: (a) maximal temperature versus rθ and rwt, (b) maximal temperature versus a1 and a2, and maximal temperature versus Sr and Sc

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Fig. 9

Local sensitivity plot: (a) rectangular dimple and (b) elliptical dimple

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Fig. 10

Pareto front: (a) rectangular dimple and (b) elliptical dimple

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Fig. 11

Pressure distribution of the optimal design: (a) rectangular dimple and (b) elliptical dimple

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Fig. 12

Temperature distribution of the optimal design: (a) rectangular dimple and (b) elliptical dimple

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