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Research Papers: Hydrodynamic Lubrication

Static and Dynamic Characteristics of Oil Lubricated Beveled-Step Herringbone-Grooved Journal Bearings

[+] Author and Article Information
M. M. Nemat-Alla1

Mechanical Engineering Department, Assiut University, Assiut 71516, Egyptnematala@acc.aun.edu.eg

A. M. Gad, A. A. Khalil, A. M. Nasr

Mechanical Engineering Department, Assiut University, Assiut 71516, Egypt

1

Corresponding author.

J. Tribol 131(1), 011701 (Nov 20, 2008) (7 pages) doi:10.1115/1.2908903 History: Received June 08, 2006; Revised December 06, 2007; Published November 20, 2008

Recently, herringbone-grooved journal bearings (HGJBs) have important applications in high-speed rotating machinery. The groove action in pumping the lubricating fluid inward generates supporting stiffness and improves the stability of the bearing when operating concentrically. Several researchers have investigated the static and dynamic characteristics of HGJBs and grooved thrust bearings. Most of these investigations were theoretical and concentrated on HGJBs with rectangular-profile grooves. In the present work, the static and dynamic characteristics of the beveled-step HGJBs are experimentally investigated. The bearing attitude angle, pressure distribution, and bearing friction torque were measured on a hydrodynamic lubrication unit, and then the static and dynamic characteristics were determined. The obtained experimental results are compared to the obtained experimental results for plain journal bearing. The merits as well as the demerits of the groove profile were discussed through comparisons with plain journal bearings.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Geometry of the beveled-step HGJB

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Figure 2

Pressure distribution at the plane of bearing symmetry for various journal speeds

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Figure 3

Pressure distribution at the axis of bearing symmetry for various applied loads.

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Figure 4

Variations of the attitude angle with eccentricity ratio for various values of the bearing number (Λ)

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Figure 5

Variation of the dimensionless load carrying capacity with the eccentricity ratio (ε) for various values of the bearing number (Λ)

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Figure 6

Variation of the bearing friction torque with eccentricity ratio (ε)

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Figure 7

Pressure distributions, at the axis of symmetry, for beveled-step HGJB and plain journal bearing

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Figure 8

Pressure distribution in the axial direction for beveled-step HGJB and plain journal bearing

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Figure 9

Variation of the bearing attitude angle with eccentricity ratio for beveled-step HGJB and plain journal bearing

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Figure 10

Variation of the dimensionless radial force with the eccentricity ratio (ε)

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Figure 11

Variation of the dimensionless load carrying capacity (W¯) with eccentricity ratio for the beveled-step HGJB and plain journal bearing

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Figure 12

Variation of the dimensionless friction torque (Tr¯) with eccentricity ratio for the beveled-step HGJB and plain journal bearing

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Figure 13

The considered coordinate system

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Figure 14

Variation of the dimensionless direct stiffness coefficient (Kxx¯) with eccentricity ratio for various values of the bearing number

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Figure 15

Variation of the dimensionless direct stiffness coefficient (Kyy¯) with eccentricity ratio for various values of the bearing number

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Figure 16

Variation of the cross-coupled stiffness (Kxy¯−Kyx¯) with eccentricity ratio for various values of the bearing number

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Figure 17

Variation of the dimensionless direct stiffness coefficient (Kxx¯) with eccentricity ratio for beveled-step HGJB and plain journal bearing

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Figure 18

Variation of the dimensionless direct stiffness coefficient (Kyy¯) with eccentricity ratio for beveled-step HGJB and plain journal bearing

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Figure 19

Variation of the cross-coupled stiffness (Kxy¯−Kyx¯) with eccentricity ratio

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