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RESEARCH PAPERS

Characteristics of Powder Lubricated Finite-Width Journal Bearings: A Hydrodynamic Analysis

[+] Author and Article Information
Hung-Jung Tsai

Department of Mechanical Engineering, WuFeng Institute of Technology, Chia-Yi, Taiwanhjtsai@mail.wfc.edu.tw

Yeau-Ren Jeng

Department of Mechanical Engineering, National Chung Cheng University, Chia-Yi, Taiwan

J. Tribol 128(2), 351-357 (Oct 16, 2005) (7 pages) doi:10.1115/1.2162558 History: Received January 20, 2005; Revised October 16, 2005

This paper analyzes the performance of hydrodynamic journal bearings by applying the control-volume method to solve the average lubrication equation for grain flow. The grain characteristics, including the particle size and the grain-grain collision elasticity are investigated. The nondimensional load, attitude angle, friction coefficient, and side flow are explored for different eccentricity and diameter-to-width ratios. The numerical results provide an understanding of the performance of powder lubricated journal bearings and are consistent with the experimental findings of Heshmat and Brewe.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 6

(a) Variation of nondimensional load with eccentricity ratio for different diameter-to-width ratio (λk=4, 1, and 1∕2); (b) variation of attitude angle with eccentricity ratio for different diameter-to-width ratio (λk=4, 1, and 1∕2); (c) variation of friction coefficient with eccentricity ratio for different diameter-to-width ratio (λk=4, 1, and 1∕2); (d) variation of side flow with eccentricity ratio for different diameter-to-width ratio (λk=4, 1, and 1∕2)

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Figure 1

Hydrodynamic journal bearing geometry

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Figure 2

Finite-difference grid for control-volume method

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Figure 3

Variation of friction coefficient with nondimensional load: theoretical results of journal bearing (d=1 and 2μm) and experimental results of three-pad journal bearing using MoS2 powder (1995) and WS2 powder (1996)

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Figure 4

(a) Variation of nondimensional load with eccentricity ratio for different particle size (d=1 and 2μm); (b) variation of attitude angle with eccentricity ratio for different particle size (d=1 and 2μm)

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Figure 5

(a) Variation of nondimensional load with eccentricity ratio for different dimensionless ratio (w∕k); (b) variation of attitude angle with eccentricity ratio for different dimensionless ratio (w∕k)

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