ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING WITH AN AXIAL GROOVE

In rotordynamic, hydrodynamic journal bearings are one of the most crucial components due to their wide demand and applications in different industries ranging from small applications, such as those supporting rotating grinders for dentistry, to large applications, like supporting generators, steam...

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Main Author: MOHAMMAD PURE, SHAHAB HAMDAVI
Format: Thesis
Language:English
Published: 2017
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Online Access:http://utpedia.utp.edu.my/22076/1/Shahab%20Hamdavi%20%5BG03106%5D.pdf
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spelling my-utp-utpedia.220762021-10-12T20:36:21Z http://utpedia.utp.edu.my/22076/ ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING WITH AN AXIAL GROOVE MOHAMMAD PURE, SHAHAB HAMDAVI TJ Mechanical engineering and machinery In rotordynamic, hydrodynamic journal bearings are one of the most crucial components due to their wide demand and applications in different industries ranging from small applications, such as those supporting rotating grinders for dentistry, to large applications, like supporting generators, steam turbines, etc. Meanwhile, stability of this kind of bearings is an essential issue and lack of appropriate design can lead to instability and undesirable vibration in the rotor-bearing systems. Surface texturing is a widely-used technique and is reported by other researchers as an appropriate way to improve static and dynamic properties and stability parameters of the hydrodynamic journal bearings. The aim of this work is to study the effects of three parameters namely groove depth, groove width, and eccentricity ratios on the linear stability of rigid rotor-bearing systems supported by two symmetric grooved hydrodynamic journal bearings. To do so, static and dynamic characteristics as well as stability parameters of the grooved hydrodynamic journal bearing need to be investigated. This investigation was conducted when a single axial groove as a subgroup of the surface texturing technique is applied to the bearing surface in the full film region. The range of case studies in this research work are limited to three groups of long, finite-length, and short hydrodynamic journal bearings. The governing equation is Reynolds equation in which three proper theories of Reynolds, finite difference method, and short bearing approximation are applied to the long, finite-length, and short journal bearings, respectively, to ease the numerical procedure. The applied groove resulted in different effects on the considered bearings. For instance, long and finite-length grooved bearings enjoy higher load-carrying capacities compared to plain bearing by 97.90% and 47.63%, respectively. Nevertheless, it cannot be a good option for static coefficients of a short journal bearing, whereby all results for grooved bearings are lower compared to plain bearing. Besides, from a stability point of view, long and short bearings with eccentricity ratios higher and lower than 0.3, respectively, are operating in the stable region. Nonetheless, the finite-length bearing does not operate at stable region and in the best condition operates on threshold contour line for eccentricity ratios higher than 0.5. 2017-07 Thesis NonPeerReviewed application/pdf en http://utpedia.utp.edu.my/22076/1/Shahab%20Hamdavi%20%5BG03106%5D.pdf MOHAMMAD PURE, SHAHAB HAMDAVI (2017) ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING WITH AN AXIAL GROOVE. Masters thesis, Universiti Teknologi PETRONAS.
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Electronic and Digitized Intellectual Asset
url_provider http://utpedia.utp.edu.my/
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
MOHAMMAD PURE, SHAHAB HAMDAVI
ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING WITH AN AXIAL GROOVE
description In rotordynamic, hydrodynamic journal bearings are one of the most crucial components due to their wide demand and applications in different industries ranging from small applications, such as those supporting rotating grinders for dentistry, to large applications, like supporting generators, steam turbines, etc. Meanwhile, stability of this kind of bearings is an essential issue and lack of appropriate design can lead to instability and undesirable vibration in the rotor-bearing systems. Surface texturing is a widely-used technique and is reported by other researchers as an appropriate way to improve static and dynamic properties and stability parameters of the hydrodynamic journal bearings. The aim of this work is to study the effects of three parameters namely groove depth, groove width, and eccentricity ratios on the linear stability of rigid rotor-bearing systems supported by two symmetric grooved hydrodynamic journal bearings. To do so, static and dynamic characteristics as well as stability parameters of the grooved hydrodynamic journal bearing need to be investigated. This investigation was conducted when a single axial groove as a subgroup of the surface texturing technique is applied to the bearing surface in the full film region. The range of case studies in this research work are limited to three groups of long, finite-length, and short hydrodynamic journal bearings. The governing equation is Reynolds equation in which three proper theories of Reynolds, finite difference method, and short bearing approximation are applied to the long, finite-length, and short journal bearings, respectively, to ease the numerical procedure. The applied groove resulted in different effects on the considered bearings. For instance, long and finite-length grooved bearings enjoy higher load-carrying capacities compared to plain bearing by 97.90% and 47.63%, respectively. Nevertheless, it cannot be a good option for static coefficients of a short journal bearing, whereby all results for grooved bearings are lower compared to plain bearing. Besides, from a stability point of view, long and short bearings with eccentricity ratios higher and lower than 0.3, respectively, are operating in the stable region. Nonetheless, the finite-length bearing does not operate at stable region and in the best condition operates on threshold contour line for eccentricity ratios higher than 0.5.
format Thesis
author MOHAMMAD PURE, SHAHAB HAMDAVI
author_facet MOHAMMAD PURE, SHAHAB HAMDAVI
author_sort MOHAMMAD PURE, SHAHAB HAMDAVI
title ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING WITH AN AXIAL GROOVE
title_short ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING WITH AN AXIAL GROOVE
title_full ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING WITH AN AXIAL GROOVE
title_fullStr ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING WITH AN AXIAL GROOVE
title_full_unstemmed ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING WITH AN AXIAL GROOVE
title_sort analysis of hydrodynamic journal bearing with an axial groove
publishDate 2017
url http://utpedia.utp.edu.my/22076/1/Shahab%20Hamdavi%20%5BG03106%5D.pdf
http://utpedia.utp.edu.my/22076/
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score 13.160551