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Research Papers: Hydrodynamic Lubrication

Performance Analysis of a Nonrecessed Hybrid Conical Journal Bearing Compensated With Capillary Restrictors

[+] Author and Article Information
Prashant G. Khakse

Machine Dynamics and Vibration Laboratory,
Department of Mechanical Engineering,
VJTI,
Mumbai 400019, India
e-mail: prashantkhakse@yahoo.com

Vikas M. Phalle

Associate Professor
Department of Mechanical Engineering,
VJTI,
Mumbai 400019, India
e-mail: vmphalle@gmail.com

S. S. Mantha

Professor
Department of Mechanical Engineering,
VJTI,
Mumbai 400019, India
e-mail: ssmantha@vjti.org.in

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 9, 2015; final manuscript received June 6, 2015; published online August 6, 2015. Assoc. Editor: George K. Nikas.

J. Tribol 138(1), 011703 (Aug 06, 2015) (9 pages) Paper No: TRIB-15-1073; doi: 10.1115/1.4030808 History: Received March 09, 2015

The present paper deals with the performance analysis of a nonrecessed hole-entry hydrostatic/hybrid conical journal bearing with capillary restrictors. Finite element method has been used for solving the modified Reynolds equation governing the flow of lubricant in the clearance space of journal and bearing. The hole-entry hybrid conical journal bearing performance characteristics have been depicted for a wide range of radial load parameter (W¯r  = 0.25–1.5) with uniform distribution of holes at an angle of 30 deg in the circumferential direction. The numerically simulated results have been presented in terms of maximum fluid film pressure, minimum fluid film thickness, lubricant flow rate, direct fluid film stiffness coefficients, direct fluid film damping coefficients, and stability threshold speed. However, the proposed investigation of nonrecess hole-entry hybrid conical journal bearing shows important performance for bearing stiffness and minimum fluid film thickness at variable radial load and at given operating speed.

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Figures

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Fig. 1

(a) Nonrecess hole-entry hydrostatic/hybrid conical journal bearing. (b) Two-dimensional nonrecess hole-entry hydrostatic/hybrid conical journal bearing with semicone angle. (c) Mesh of lubricant flow field.

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Fig. 2

Capillary restrictor

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Fig. 3

Solution procedure flow chart

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Fig. 4

Variation of radial load “ W¯r” with eccentricity ratio “ε

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Fig. 5

Variation of maximum pressure p¯max with radial load W¯r

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Fig. 6

Variation of minimum fluid film thickness h¯min with radial load W¯r

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Fig. 7

Variation of bearing flow () with radial load W¯r

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Fig. 8

Variation of fluid film stiffness S¯11 with radial load W¯r

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Fig. 9

Variation of fluid film stiffness S¯22 with radial load W¯r

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Fig. 10

Variation of fluid film damping C¯11 with radial load W¯r

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Fig. 11

Variation of fluid film damping C¯22 with radial load W¯r

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Fig. 12

Variation of threshold speed ω¯th with radial load W¯r

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