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Stability evaluation of three-layered journal bearing with slip/partial slip

Purpose - This paper aims to present stability of a three-layered journal bearing considering magnitude of the layers' thicknesses and viscosities with slip/partial slip on the bearing surface. Design/methodology/approach - Modified Reynolds equation based on one-dimensional analysis is derived...

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Main Authors: Rao, T.V.V.L.N., Rani, A.M.A., Awang, M., Hashim, F.M.
Format: Article
Published: Emerald Group Publishing Ltd. 2017
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020928238&doi=10.1108%2fILT-08-2016-0184&partnerID=40&md5=56fa655c5f98a942559323fb48b3de8f
http://eprints.utp.edu.my/19755/
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spelling my.utp.eprints.197552018-04-20T07:37:24Z Stability evaluation of three-layered journal bearing with slip/partial slip Rao, T.V.V.L.N. Rani, A.M.A. Awang, M. Hashim, F.M. Purpose - This paper aims to present stability of a three-layered journal bearing considering magnitude of the layers' thicknesses and viscosities with slip/partial slip on the bearing surface. Design/methodology/approach - Modified Reynolds equation based on one-dimensional analysis is derived for a three-layered journal bearing with slip/partial slip. Dynamic coefficients are derived based on infinitesimal perturbation method. Linearized stability analysis is presented taking into account slip/partial slip on bearing surface; thicknesses and viscosities of bearing surface layer; and core layer and journal surface layer. Findings - Results of threshold speed and critical whirl frequency ratio coefficients (Cω, CΩ), stiffness (Kij for i = x, y) and damping (Bij for i = x, y) coefficients and threshold speed (ωs) and critical whirl frequency ratio (Ωs) are presented. The bearing surface is analyzed for slip (total surface with slip) and partial slip (partial surface with slip). The slip-on bearing surface reduces stability, while partial slip improves bearing stability. The threshold speed coefficient (Cω) decreases with slip on bearing surface. The threshold speed (ωs) and critical whirl frequency ratio (Ωs) are influenced by the variation of threshold speed coefficient (Cω) and critical whirl frequency ratio coefficient (CΩ), respectively. A three-layered journal bearing with partial slip and thick high viscosity bearing surface layer results in higher threshold speed coefficient and has a potential to improve stability of journal bearing. The analyses indicate that optimal angular extent of partial slip region (θs) enhances the stability of journal bearing. Originality/value - The paper presents parametric study of stability coefficients (Cω and CΩ) and evaluation of threshold speed (ωs) and critical whirl frequency ratio (Ωs) of a three-layered journal bearing with slip/partial slip. © 2017 Emerald Publishing Limited. Emerald Group Publishing Ltd. 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020928238&doi=10.1108%2fILT-08-2016-0184&partnerID=40&md5=56fa655c5f98a942559323fb48b3de8f Rao, T.V.V.L.N. and Rani, A.M.A. and Awang, M. and Hashim, F.M. (2017) Stability evaluation of three-layered journal bearing with slip/partial slip. Industrial Lubrication and Tribology, 69 (3). pp. 334-341. http://eprints.utp.edu.my/19755/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description Purpose - This paper aims to present stability of a three-layered journal bearing considering magnitude of the layers' thicknesses and viscosities with slip/partial slip on the bearing surface. Design/methodology/approach - Modified Reynolds equation based on one-dimensional analysis is derived for a three-layered journal bearing with slip/partial slip. Dynamic coefficients are derived based on infinitesimal perturbation method. Linearized stability analysis is presented taking into account slip/partial slip on bearing surface; thicknesses and viscosities of bearing surface layer; and core layer and journal surface layer. Findings - Results of threshold speed and critical whirl frequency ratio coefficients (Cω, CΩ), stiffness (Kij for i = x, y) and damping (Bij for i = x, y) coefficients and threshold speed (ωs) and critical whirl frequency ratio (Ωs) are presented. The bearing surface is analyzed for slip (total surface with slip) and partial slip (partial surface with slip). The slip-on bearing surface reduces stability, while partial slip improves bearing stability. The threshold speed coefficient (Cω) decreases with slip on bearing surface. The threshold speed (ωs) and critical whirl frequency ratio (Ωs) are influenced by the variation of threshold speed coefficient (Cω) and critical whirl frequency ratio coefficient (CΩ), respectively. A three-layered journal bearing with partial slip and thick high viscosity bearing surface layer results in higher threshold speed coefficient and has a potential to improve stability of journal bearing. The analyses indicate that optimal angular extent of partial slip region (θs) enhances the stability of journal bearing. Originality/value - The paper presents parametric study of stability coefficients (Cω and CΩ) and evaluation of threshold speed (ωs) and critical whirl frequency ratio (Ωs) of a three-layered journal bearing with slip/partial slip. © 2017 Emerald Publishing Limited.
format Article
author Rao, T.V.V.L.N.
Rani, A.M.A.
Awang, M.
Hashim, F.M.
spellingShingle Rao, T.V.V.L.N.
Rani, A.M.A.
Awang, M.
Hashim, F.M.
Stability evaluation of three-layered journal bearing with slip/partial slip
author_facet Rao, T.V.V.L.N.
Rani, A.M.A.
Awang, M.
Hashim, F.M.
author_sort Rao, T.V.V.L.N.
title Stability evaluation of three-layered journal bearing with slip/partial slip
title_short Stability evaluation of three-layered journal bearing with slip/partial slip
title_full Stability evaluation of three-layered journal bearing with slip/partial slip
title_fullStr Stability evaluation of three-layered journal bearing with slip/partial slip
title_full_unstemmed Stability evaluation of three-layered journal bearing with slip/partial slip
title_sort stability evaluation of three-layered journal bearing with slip/partial slip
publisher Emerald Group Publishing Ltd.
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020928238&doi=10.1108%2fILT-08-2016-0184&partnerID=40&md5=56fa655c5f98a942559323fb48b3de8f
http://eprints.utp.edu.my/19755/
_version_ 1738656114911739904
score 13.211869

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