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Research Papers: Hydrodynamic Lubrication

Dynamic Characteristics of Aerostatic Porous Journal Bearings With a Surface-Restricted Layer

[+] Author and Article Information
Yuta Otsu

 JTECKT Co., 1-1 Asahi-Machi, Kariya, Aichi 448-8652, Japan

Masaaki Miyatake

 Oiles Co., 8 Kirihara-cho, Fujisawa-shi, Kanagawa-ken 252-0811, Japan

Shigeka Yoshimoto1

Department of Mechanical Engineering, Tokyo University of Science, 1-14-6 Kudankita, Chiyoda-ku, Tokyo 102-0073, Japanyosimoto@rs.kagu.tus.ac.jp

1

Corresponding author.

J. Tribol 133(1), 011701 (Dec 03, 2010) (10 pages) doi:10.1115/1.4002730 History: Received January 20, 2010; Revised September 26, 2010; Published December 03, 2010; Online December 03, 2010

Aerostatic porous bearings have been successfully applied to various precision devices such as machine tools and measuring equipment to achieve a higher accuracy of motion. However, aerostatic porous bearings have a disadvantage in that they are prone to cause pneumatic hammer instability. Therefore, to avoid this instability, a surface-restricted layer that has permeability smaller than the bulk of the porous material is usually formed on the bearing surface. In this paper, the dynamic characteristics of aerostatic porous journal bearings that have a surface-restricted layer are investigated numerically and experimentally. The effects of permeability in bulk porous materials and of a surface-restricted layer on the bearing characteristics are discussed using two kinds of porous material: graphite and metal. It was confirmed that aerostatic porous metal bearings with relatively large permeability could achieve large values of dynamic stiffness and damping coefficients using a low permeability, surface-restricted layer.

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Figures

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Figure 1

Aerostatic porous journal bearing with a surface-restricted layer

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Figure 2

Continuity of mass flow rate in a small control volume

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Figure 3

Relationship between psg and Q

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Figure 4

Aerostatic journal bearing with compound restrictors

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Figure 5

Relationships between h0 and KS: (a) porous graphite model k=2.0×10−9 mm2, (b) porous metal model k=2.0×10−8 mm2, and (c) compound restrictors

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Figure 6

Variations in σ versus Kd and B: (a) porous graphite model k=2.0×10−9 mm2, η=10% and (b) porous metal model k=2.0×10−8 mm2, η=30%

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Figure 7

Comparisons of dynamic characteristics between aerostatic porous bearings and compound restrictors: (a) h0=5 μm and (b) h0=8 μm

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Figure 8

Experimental apparatus

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Figure 9

Relationships between psg and Q: (a) porous graphite bearing and (b) porous metal bearing

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Figure 10

Variations of h0 versus Kd and B: (a) porous graphite bearing and (b) porous metal bearing

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