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Studies on tribology

In high speed rotating machines such as turbines and generators, vibrations of a rotating shaft often hinder the smooth operation of the machine or even cause failure. Oil whip is one of such vibrations due to oil film action of journal bearing. Its mechanism and preventive method is explained and p...

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Detalles Bibliográficos
Autores principales: Hori, Yukio, Kato, Koji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Japan Academy 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3722018/
https://www.ncbi.nlm.nih.gov/pubmed/18941304
http://dx.doi.org/10.2183/pjab/84.287
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author Hori, Yukio
Kato, Koji
author_facet Hori, Yukio
Kato, Koji
author_sort Hori, Yukio
collection PubMed
description In high speed rotating machines such as turbines and generators, vibrations of a rotating shaft often hinder the smooth operation of the machine or even cause failure. Oil whip is one of such vibrations due to oil film action of journal bearing. Its mechanism and preventive method is explained and proposed in this paper. Further theoretical and experimental analyses are made for considering heat generation and temperature rise in hydrodynamic lubrication. The usefulness of the lubrication theory based on the k–ε model is also shown for bearings with high eccentricity ratios. In the latter half of this paper, water lubrication, nitrogen gas lubrication and tribo-coated indium lubrication are shown as new promising methods, and their mechanisms are discussed and the importance of tribo-layer is explained. Some mechanisms of wear are introduced for better understanding of tribo-layer. In the last part of this paper, the mechanisms of generating static friction are shown for the cases of plastic contact and elastic contact, which is the base for understanding the mechanism of initiation of macroscopic sliding.
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spelling pubmed-37220182013-08-09 Studies on tribology Hori, Yukio Kato, Koji Proc Jpn Acad Ser B Phys Biol Sci Review In high speed rotating machines such as turbines and generators, vibrations of a rotating shaft often hinder the smooth operation of the machine or even cause failure. Oil whip is one of such vibrations due to oil film action of journal bearing. Its mechanism and preventive method is explained and proposed in this paper. Further theoretical and experimental analyses are made for considering heat generation and temperature rise in hydrodynamic lubrication. The usefulness of the lubrication theory based on the k–ε model is also shown for bearings with high eccentricity ratios. In the latter half of this paper, water lubrication, nitrogen gas lubrication and tribo-coated indium lubrication are shown as new promising methods, and their mechanisms are discussed and the importance of tribo-layer is explained. Some mechanisms of wear are introduced for better understanding of tribo-layer. In the last part of this paper, the mechanisms of generating static friction are shown for the cases of plastic contact and elastic contact, which is the base for understanding the mechanism of initiation of macroscopic sliding. The Japan Academy 2008-10 /pmc/articles/PMC3722018/ /pubmed/18941304 http://dx.doi.org/10.2183/pjab/84.287 Text en © 2008 The Japan Academy This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Review
Hori, Yukio
Kato, Koji
Studies on tribology
title Studies on tribology
title_full Studies on tribology
title_fullStr Studies on tribology
title_full_unstemmed Studies on tribology
title_short Studies on tribology
title_sort studies on tribology
topic Review
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3722018/
https://www.ncbi.nlm.nih.gov/pubmed/18941304
http://dx.doi.org/10.2183/pjab/84.287
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