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Technical Brief

Research on the Static and Dynamic Characteristics of Misaligned Journal Bearing Considering the Turbulent and Thermohydrodynamic Effects

[+] Author and Article Information
Guohui Xu

State Key Laboratory for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: pear_516@126.com

Jian Zhou

State Key Laboratory for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: xuguohui1983@126.com

Haipeng Geng

State Key Laboratory for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: 544089501@qq.com

Mingjian Lu

State Key Laboratory for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: lmj0925@qq.com

Lihua Yang

State Key Laboratory for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: 527405780@qq.com

Lie Yu

State Key Laboratory for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: pear_516@163.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 25, 2014; final manuscript received December 2, 2014; published online January 29, 2015. Assoc. Editor: Joichi Sugimura.

J. Tribol 137(2), 024504 (Apr 01, 2015) (8 pages) Paper No: TRIB-14-1116; doi: 10.1115/1.4029333 History: Received May 25, 2014; Revised December 02, 2014; Online January 29, 2015

Journal misalignment usually exists in journal bearings that affect nearly all the bearings static and dynamic characteristics including minimum oil film thickness, maximum oil film pressure, maximum oil film temperature, oil film stiffness, and damping. The main point in this study is to provide a comprehensive analysis on the oil film pressure, oil film temperature, oil film thickness, load-carrying capacity, oil film stiffness, and damping of journal bearing with different misalignment ratios and appropriately considering the turbulent and thermo effects based on solving the generalized Reynolds equation and energy equation. The results indicate that the oil thermo effects have a significant effect on the lubrication of misaligned journal bearings under large eccentricity ratio. The turbulent will obviously affect the lubrication of misaligned journal bearings when the eccentricity or misalignment ratio is large. In the present design of the journal bearing, the load and speed become higher and higher, and the eccentricity and misalignment ratio are usually large in the operating conditions. Therefore, it is necessary to take the effects of journal misalignment, turbulent, and thermal effect into account in the design and analysis of journal bearings.

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References

Figures

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Fig. 2

System of misaligned journal bearing

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Fig. 3

Flow chart of the misaligned bearing

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Fig. 1

A misaligned journal bearing

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Fig. 4

Performance of the journal bearing (α = 0) at different misalignment ratio (ψ = 0 and ψ = 0.5) with the eccentricity ratio ε considering or without considering turbulent effect. (a1) The load capacity, (a2) the maximum oil pressure, (a3) the maximum oil temperature; (b1) The minimum oil thickness, (b2) the attitude angle, (b3) the direct stiffness of oil; (c1) The direct stiffness of oil, (c2) the cross stiffness of oil, (c3) the cross stiffness of oil; and (d1) The direct damping of oil, (d2) the direct damping of oil, (d3) the cross damping of oil.

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Fig. 5

Distribution of oil pressure and oil film thickness of the journal bearing (φ0 = 0.523, α = 0) at different misalignment ratio ψ with the eccentricity ratio ε = 0.2 considering or without considering turbulent effect. (a1) Oil pressure (ψ = 0, Re* = 0), (a2) oil pressure (ψ = 0.3, Re* = 0), (a3) oil pressure (ψ = 0.6, Re* = 0); (b1) Oil pressure (ψ = 0, Re* = 5000), (b2) oil pressure (ψ = 0.3, Re* = 5000), (b3) oil pressure (ψ = 0.6, Re* = 5000); and (c1) Film thickness (ψ = 0, Re* = 5000), (c2) film thickness (ψ = 0.3, Re* = 5000), (c3) film thickness (ψ = 0.6, Re* = 5000).

Grahic Jump Location
Fig. 6

Performance of the journal bearing (α = 0) at different misalignment ratio (ψ = 0 and ψ = 0.5) with the eccentricity ratio ε when considering or not considering thermal effect. (a1) The load capacity, (a2) the maximum oil pressure, (a3) the maximum oil temperature; (b1) The direct stiffness of oil, (b2) the direct stiffness of oil (b3), the cross stiffness of oil; and (c1) The cross stiffness of oil, (c2) the direct damping of oil, (c3) the direct damping of oil, (c4) the cross damping of oil.

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