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Research Papers: Hydrodynamic Lubrication

Experimental Evaluation of the Structure Characterization of a Novel Hybrid Bump-Metal Mesh Foil Bearing

[+] Author and Article Information
Kai Feng

State Key Laboratory of Advanced Design and
Manufacturing for Vehicle Body,
College of Mechanical and Vehicle Engineering,
Hunan University,
Changsha, Hunan 410082, China
e-mail: kfeng@hnu.edu.cn

Yuman Liu

State Key Laboratory of Advanced Design and
Manufacturing for Vehicle Body,
College of Mechanical and Vehicle Engineering,
Hunan University,
Changsha, Hunan 410082, China
e-mail: liuyuman@hnu.edu.cn

Xueyuan Zhao

State Key Laboratory of Advanced Design and
Manufacturing for Vehicle Body,
College of Mechanical and Vehicle Engineering,
Hunan University,
Changsha, Hunan 410082, China
e-mail: xy_zhao@hnu.edu.cn

Wanhui Liu

State Key Laboratory of Advanced Design and
Manufacturing for Vehicle Body,
College of Mechanical and Vehicle Engineering,
Hunan University,
Changsha, Hunan 410082, China
e-mail: duozhu@yeah.net

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 4, 2015; final manuscript received August 17, 2015; published online October 15, 2015. Assoc. Editor: Daejong Kim.

J. Tribol 138(2), 021702 (Oct 15, 2015) (9 pages) Paper No: TRIB-15-1108; doi: 10.1115/1.4031496 History: Received April 04, 2015; Revised August 17, 2015

Rotors supported by gas foil bearings (GFBs) experience stability problem caused by subsynchronous vibrations. To obtain a GFB with satisfactory damping characteristics, this study presented a novel hybrid bump-metal mesh foil bearing (HB-MMFB) that consists of a bump foil and metal mesh blocks in an underlying supporting structure, which takes advantage of both bump-type foil bearings (BFBs) and MMFBs. A test rig with a nonrotating shaft was designed to estimate structure characterization. Results from the static load tests show that the proposed HB-MFBs exhibit an excellent damping level compared with the BFBs with a similar size because of the countless microslips in the metal mesh blocks. In the dynamic load tests, the HB-MFB with a metal mesh density of 36% presents a viscous damping coefficient that is approximately twice that of the test BFB. The dynamics structural coefficients of HB-MFBs, including structural stiffness, equivalent viscous damping, and structural loss factor, are all dependent on excitation frequency and motion amplitude. Moreover, they exhibit an obvious decrease with the decline in metal mesh density.

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Figures

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Fig. 1

Schematic of HB-MFB

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Fig. 2

Photograph of HB-MFB

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Fig. 3

Test rig for the static load test

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Fig. 4

Test rig for the dynamic load test

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Fig. 5

Static load versus bearing displacement plots: (a) HB-MFB with a relative density of 36% and (b) BFB

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Fig. 6

Structural stiffness versus bearing displacement plots: (a) HB-MFB with a relative density of 36% and (b) BFB

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Fig. 7

Results of the static load tests of HB-MFBs with different mesh densities (36%, 28%, and 20%): (a) static load versus bearing displacement and (b) structural stiffness versus bearing displacement

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Fig. 8

Dynamic structural characteristics versus excitation frequency with a motion amplitude of 12 m plots for HB-MFB (36%) and BFB: (a) structural stiffness, (b) equivalent viscous damping, and (c) loss factor

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Fig. 9

Dynamic force performance versus the excitation frequency with a motion amplitude of 12 m plots for HB-MFB with metal mesh densities of 36%, 28%, and 20%: (a) calculated dynamic structural stiffness, (b) equivalent viscous damping, and (c) structural loss factor

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Fig. 10

Dynamic structural characteristics versus excitation frequency plots for the increasing motion amplitude of HB-MFB (28%): (a) structural stiffness, (b) equivalent viscous damping, and (c) structural loss factor

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