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Study of Frictional Performance of Textured Journal Bearings
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Journal bearings are used in automobiles as engine main bearings. The application of surface texturing on journal bearings is a hot topic for its possibility in improving tribological performance. However for texturing on the journal surface, more theoretical analysis is needed. This work presented two models for estimating surface textures’ effect on journal bearings’ performance. At first, a model based on Reynolds equation was used to give a brief view on how surface textures may influence the Load Carrying Capacity (LCC) of journal bearings. Contour maps showing the impact of micro-pockets in different dimensions were produced. Then a Computational Fluid Dynamics (CFD) model of a journal bearing was built using commercial software ANSYS CFX 14.0. Modeling and meshing of the fluid part was accomplished using ICEM software. Four dimples were modeled uniformly spaced on the journal surface. A density variation type of cavitation model was also incorporated. The highlight of the CFD model was the stator-rotor interface set-up, which enables the transient simulation of a rotating textured surface. Oscillation induced by approximation of geometric model’s topography was observed in transient simulation, but this will not impact relative comparison between different cases. Using the CFD model, a parametric study was performed on texture dimensions (dimple depth and width). Contour maps were produced for relative LCC and Coefficient of Friction (CoF) to find optimum or preferred texture dimensions. Textures’ influence on film thickness was also investigated. Finally, considering both textures’ influence on friction and film thickness, it was concluded that the texturing on journal surface may incur more disadvantages than benefits. Under very light load, textures in certain dimensions may be beneficial, but under heavy load, textures can only create detrimental effects, which are more severe than the benefits they can bring.

Place, publisher, year, edition, pages
2016.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-159OAI: oai:DiVA.org:ltu-159DiVA, id: diva2:971711
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Examiners
Available from: 2016-09-22 Created: 2016-09-19 Last updated: 2016-09-22Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf