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


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.

Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

Aerostatic porous journal bearing with a surface-restricted layer

Grahic Jump Location
Figure 2

Continuity of mass flow rate in a small control volume

Grahic Jump Location
Figure 3

Relationship between psg and Q

Grahic Jump Location
Figure 4

Aerostatic journal bearing with compound restrictors

Grahic Jump Location
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

Grahic Jump Location
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%

Grahic Jump Location
Figure 7

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

Grahic Jump Location
Figure 8

Experimental apparatus

Grahic Jump Location
Figure 9

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

Grahic Jump Location
Figure 10

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



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In