0
Research Papers: Hydrodynamic Lubrication

Influence of Wear on the Performance of Multirecess Hydrostatic Journal Bearing Operating With Micropolar Lubricant

[+] Author and Article Information
E. Rajasekhar Nicodemus1

Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand 247667, Indiarajasekhar_mvgr@yahoo.co.in

Satish C. Sharma

Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand 247667, Indiasshmefme@iitr.ernet.in

1

Corresponding author.

J. Tribol 132(2), 021703 (Apr 13, 2010) (11 pages) doi:10.1115/1.4000940 History: Received August 09, 2009; Revised December 19, 2009; Published April 13, 2010; Online April 13, 2010

The objective of the present work is to study theoretically the influence of wear on the performance of four-pocket capillary-compensated hydrostatic journal bearing operating with micropolar lubricant. In the present study, the lubricant containing additives and contaminants is modeled as micropolar fluid. The modified Reynolds equation for micropolar lubricant is solved using finite element method along with capillary restrictor flow equation as a constraint together with appropriate boundary conditions. The performance characteristics of a capillary-compensated four-pocket worn hydrostatic journal bearing operating with micropolar lubricant have been presented for a wide range of values of nondimensional external load, wear depth parameter, and micropolar parameters. The simulated results have also been presented for two different loading arrangements. In arrangement I, the load line acts through centers of the pockets, whereas in arrangement II, the load line bisects the land between two pockets. The simulated results suggest that a bearing lubricated with lubricant having higher micropolar effect has better static and dynamic performance characteristics as compared with Newtonian lubricant but the bearing lubricated with lubricant having higher micropolar effect is predominantly affected by the wear vis a vis static characteristics parameters as compared with Newtonian lubricant for both loading arrangements. However, in the case of stiffness and damping coefficients, loading arrangement II shows a significant higher enhancement in the value of direct stiffness and damping coefficients in z-direction due to micropolar effect as compared with load arrangement I. And also, the effect of wear on stiffness and damping coefficients in z-direction for bearing operating with micropolar lubricant is of same order as Newtonian lubricant for the loading arrangement II. A similar behavior is observed for the case of stiffness and damping coefficients in x-direction for loading arrangement I.

Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

The capillary-compensated four-pocket hydrostatic journal bearing system, coordinate system, and bearing geometry

Grahic Jump Location
Figure 2

Worn journal bearing geometry—load arrangement I

Grahic Jump Location
Figure 3

Worn journal bearing geometry—load arrangement II

Grahic Jump Location
Figure 4

Overall solution scheme

Grahic Jump Location
Figure 5

Variation in Fo with ε

Grahic Jump Location
Figure 6

Variation in h¯min with W¯o

Grahic Jump Location
Figure 7

Variation in h¯min with δ¯w

Grahic Jump Location
Figure 8

Variation in Q¯ with W¯o

Grahic Jump Location
Figure 9

Variation in Q¯ with δ¯w

Grahic Jump Location
Figure 10

Variation in S¯11 with W¯o

Grahic Jump Location
Figure 11

Variation in S¯22 with W¯o

Grahic Jump Location
Figure 12

Variation in S¯11 with δ¯w

Grahic Jump Location
Figure 13

Variation in S¯22 with δ¯w

Grahic Jump Location
Figure 14

Variation in C¯11 with W¯o

Grahic Jump Location
Figure 15

Variation in C¯22 with W¯o

Grahic Jump Location
Figure 16

Variation in C¯11 with δ¯w

Grahic Jump Location
Figure 17

Variation in C¯22 with δ¯w

Tables

Errata

Discussions

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