Load capacity of aerodynamic foil thrust bearings supported by viscoelastic material

Abstract

In recent years aerodynamic bump foil bearings have attracted considerable attention for the field of oil-free turbomachines. However, the shape of the bump foils is usually very complicated and the manufacturing of these bump foils is very troublesome. Moreover, in foil bearings applied to turbomachines, such as compressors and blowers, it is not necessary to use flexible supports made of metals because the operating temperature does not rise much. Therefore, in this article, two types of taper-land foil thrust bearings supported by viscoelastic material are proposed for easier manufacturing of foil bearings. In this work the load capacity of the proposed foil bearings experimentally and numerically was investigated. It was confirmed that the proposed bearings could be easily manufactured and operate well as aerodynamic thrust bearings. In addition, it was found that inserting a metal plate between the top foil and the viscoelastic support at the land region could improve the load capacity, and that the load capacity of the proposed foil bearing reached 160 N at 20 000 r/min.

Keywords

aerodynamic foil bearing thrust bearing viscoelastic material load capacity bearing torque

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References

Ruscitto

McCormick

Gray

‘Hydrodynamic air lubricated compliant surface bearing for an automotive gas turbine engine I - journal bearing performance’ (Cleveland, Ohio: NASA CR-135368, National Aeronautics and Space Administration 1978)

Heshmat

Walowit

J. A.

Pinkus

‘Analysis of gas lubricated foil journal bearing’

Trans. ASME, J. Tribol. 1054 (1983): 647–655

Heshmat

Walowit

J. A.

Pinkus

‘Analysis of gas lubricated compliant thrust bearing’

Trans. ASME, J. Tribol. 1054 (1983): 638–646

Heshmat

‘Advancements in the performance of aerodynamic foil journal bearings: High speed and load capability’

Trans. ASME, J. Tribol. 1164 (1994): 287–295

DellaCorte

Valco

M. J.

Load capacity estimation of foil air journal bearings for oil-free turbomachinery applications

Tribol. Trans. 434 (2000): 795–801

Hou

Xiong

L. Y.

Chen

C. Z.

‘Experimental study of a new compliant foil air bearings with elastic support’

Tribol. Trans. 472 (2004): 308–311

Lee

Y. B.

Kim

T. H.

Kim

C. H.

Lee

N. S.

Choi

D. H.

‘Dynamic characteristics of a flexible rotor system supported by a viscoelastic foil bearing (VEFB)’

Tribol. Int. 379 (2004): 679–687

Heshmat

C. A.

D. S.

Heshmat

‘Analysis of gas lubricated foil thrust bearings using coupled finite element and finite difference methods’

Trans. ASME, J. Tribol. 1221 (2000): 199–204

Bruckner

R. J.

Simulation and modeling of the hydrodynamic, thermal, and structural behavior of foil thrust bearings (: PhD Dissertation, Case Western Reserve University 2004)

10.

Dykas

Factors influencing the performance of foil gas thrust bearing for oil-free turbomachinery application (: PhD Dissertation, Case Western Reserve University 2006)

11.

Park

D. J.

Kim

C. H.

Jang

G. H.

Lee

Y. B.

‘Theoretical considerations of static dynamic characteristics of air foil thrust bearing with tilt and slip flow’

Tribol. Int. 414 (2008): 282–295

12.

Heshmat

High load capacity compliant foil hydrodynamic thrust bearing (: 1999) US Pat. 5961217

13.

Heshmat

Major breakthrough in load capacity, speed and operating temperature of foil thrust bearing. In Proceedings of the World Tribology Congress, Washington, DC, USA, 2005, paper no.WTC2005-63712.