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Research Papers: Hydrodynamic Lubrication

Identification of Dynamic Characteristics of Hybrid Bump-Metal Mesh Foil Bearings

[+] Author and Article Information
Zilong Zhao

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

Kai Feng

State Key Laboratory of Advanced Design
and Manufacturing for Vehicle Body,
Hunan Provincial Key Laboratory of Intelligent
Laser Manufacturing,
Hunan University,
Changsha 410082, Hunan Province, China
e-mail: kfeng@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 410082, Hunan Province, 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 410082, Hunan Province, China
e-mail: duozhu@yeah.net

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 13, 2016; final manuscript received March 1, 2018; published online April 26, 2018. Assoc. Editor: Daejong Kim.

J. Tribol 140(5), 051702 (Apr 26, 2018) (12 pages) Paper No: TRIB-16-1384; doi: 10.1115/1.4039721 History: Received December 13, 2016; Revised March 01, 2018

The stability of oil-free high-speed turbo-machinery can be effectively improved by increasing the damping characteristic of the gas foil bearing (GFB). Novel hybrid bump-metal mesh foil bearings (HB-MFBs) have been previously developed. Prior experimental results show that the parallel combination of bump structure and metal mesh not only can improve the structure stiffness but also provide better damping property compared with the bump-type foil structure. To investigate the dynamic behavior of floating HB-MFBs and promote its application, this study measured the dynamic force coefficients of HB-MFBs on a rotating test rig. The vibrations of HB-MFBs with different mesh densities (40%, 32.5%, and 25%) and a generation І bump-type foil bearing (BFB) with similar size are measured under static and impact loads to estimate the bearing characteristics. Static load test results show that the linear stiffness decreases when the air film is generated (from 0 rpm to 20 krpm) but increases gradually with speed (from 20 krpm to 30 krpm, and 40 krpm). Moreover, the dynamic force coefficients of HB-MFBs indicate the significant influence of metal mesh density on bearing dynamic characteristics. The growth in block density increases the dynamic stiffness and damping coefficients of bearing. The comparison of HB-MFB (32.5% and 40%) and BFB emphasizes the good damping characteristics of HB-MFB.

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Figures

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Fig. 4

Static load-deflection test results for HB-MFBs with metal mesh density of 40%, 32.5%, and 25% when the rotor operates at (a) 0 rpm, (b) 20 krpm, (c) 30 krpm, and (d) 40 krpm

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Fig. 3

Schematic showing (a) and photograph (b) of the test rig for pull and push load tests

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Fig. 2

Schematic view of the test BFB

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Fig. 1

Schematic view of the test HB-MFBs and metal mesh blocks with densities of 40%, 32.5%, and 25%

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Fig. 5

Schematic showing (a) and photograph (b) of the test rig for impact load tests

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Fig. 6

Inertial coordinate system of the bearing

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Fig. 7

Structural force coefficients versus frequency of HB-MFBs with metal mesh densities of 40%, 32.5%, and 25% and BFB: (a) structural stiffness, (b) structural damping, and (c) structural loss factor with stationary journal

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Fig. 12

Displacement and acceleration of bearing in time and frequency domains

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Fig. 16

Bearing structural stiffness with three different mesh density ((a) 25%, (b) 32.5%, and (c) 40%) versus frequency when the journal rests; results from four different measurements and their average

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Fig. 17

Bearing structural damping with three different mesh density ((a) 25%, (b) 32.5%, and (c) 40%) versus frequency when the journal rests; results from four different measurements and their average

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Fig. 18

Bearing (a) stiffness and (b) damping with mesh density of 25% versus frequency when the journal rotates at 48krpm; results from four different measurements and their average

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Fig. 8

Force coefficients versus frequency of HB-MFB with mesh density of 25%: (a) stiffness, (b) equivalent viscous damping, and (c) loss factor

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Fig. 9

Stiffness of HB-MFBs with mesh densities of 40%, 32.5%, and 25% and BFB in frequency domain with journal rotating at 48 krpm: (a) direct stiffness and (b) cross-coupled stiffness

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Fig. 10

Equivalent viscous damping of HB-MFBs with mesh densities of 40%, 32.5%, and 25% and BFB in frequency domain with journal rotating at 48 krpm: (a) direct damping and (b) cross-coupled damping

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Fig. 11

Loss factor of HB-MFBs with mesh densities of 40%, 32.5%, and 25% and BFB in frequency domain with journal rotating at 48 krpm

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Fig. 13

Amplitudes of bearing cartridge acceleration versus frequency (measured by accelerometer and derived from displacement measured by eddy current sensor)

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Fig. 14

Amplitude of bearing displacement with respect to journal in frequency domain without impact load applied on the bearing when the journal rotates at 48 krpm

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Fig. 15

Amplitude of bearing displacement with respect to journal in frequency domain with impact load (X direction) applied on the bearing when the journal rotates at 48 krpm

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