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Research Papers: Hydrodynamic Lubrication

Enhancement of Reversible Rotation Journal Bearing Performance Using Elliptical Grooves

[+] Author and Article Information
Ruey-Hor Yen

Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan

Chien-Yu Chen1

Institute of Nanotechnology and Microsystems Engineering, National Chen Kung University, Tainan 70101, Taiwanjoec@mail.ncku.edu.tw

1

Corresponding author.

J. Tribol 133(1), 011704 (Jan 05, 2011) (9 pages) doi:10.1115/1.4003148 History: Received March 09, 2010; Revised November 24, 2010; Published January 05, 2011; Online January 05, 2011

To improve the performance of a reversible rotation herringbone journal bearing (Rev-HGJB), this study uses reversible elliptical grooves on a journal bearing (Rev-EGJB) and numerically analyzes its characteristics, utilizing the spectral element method. Load capacity, pressure distribution, power loss, and dimensionless radial stiffness of the Rev-EGJB are compared with those of the Rev-HGJB. This comparison shows that the introduced Rev-EGJB exhibits a higher load capacity and a lower power loss than the Rev-HGJB. The pressure region in the Rev-EGJB is higher than that in the Rev-HGJB, which is achieved not only in the pressure-generated region, but also in the pressure-restored region. The load distributions of the Rev-HGJB and Rev-EGJB are also compared in order to determine how the elliptical grooves enhance the load characteristics. The optimum groove parameters of the Rev-EGJB at an eccentricity of 0.1 are investigated by studying the groove parametric matrix, which is given by taking several values in the effective range of each groove parameter. Ultimately, the radial stiffness of the Rev-EGJB with grooved bearing was also shown to be greater compared with that of a Rev-HGJB with optimum geometry; thus, the Rev-EGJB is more stable than the Rev-HGJB when the bearing is grooved.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The reversible rotation type herringbone grooved journal bearing proposed by Kawabata (9)

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Figure 2

Fluid thickness in the ridge or groove regions in terms of circumferential coordinates

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Figure 3

The shape of the reversible rotation journal bearing with elliptical grooves

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Figure 4

The mesh system used in the program for Rev-EGJB

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Figure 5

Grid-independent test to evaluate the load capacity of Rev-EGJB

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Figure 6

Comparison of the load capacities for a HGJB using the present code to the experimental data presented by Hirs (18)

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Figure 7

The numerical program for the Rev-HGJB was verified using the data from Ref. 9

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Figure 8

(a) The numerical program of the Rev-EGJB was validated by increasing the number of groove sides of the Rev-HGJB. (b) Sketch of reversible-elliptical grooves and herringbone grooves with eight sides.

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Figure 9

(a) Comparison of the load capacities of the conventional HGJB, SGJB, and EGJB with the increase of the eccentricity ratio. (b) Comparison of the leakages of the conventional HGJB, SGJB, and EGJB with the increase of the eccentricity ratio. (c) Comparison of the radial stiffness of the conventional HGJB, SGJB, and EGJB with the increase of the eccentricity ratio.

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Figure 10

Comparison of the load capacities of the conventional HGJB, Rev-HGJB, and Rev-EGJB with the increase of the eccentricity ratio (grooved journal)

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Figure 11

The load capacity of the Rev-HGJB and Rev-EGJB with grooved bearing for L/D=1,2

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Figure 12

The pressure distributions of fluid film of a Rev-EGJB and of a Rev-HGJB under the operating conditions in Table 2(ε=0.3)

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Figure 13

The load per unit length along the y-direction

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Figure 14

The influences of elliptical axis ratio of region 1 and region 2 on dimensionless radial stiffness

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Figure 15

The influences of groove depth on dimensionless radial stiffness

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Figure 16

The effect of groove width on dimensionless radial stiffness

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Figure 17

The effect of bearing length of region 2 on dimensionless radial stiffness

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