A perspective on oil-whirl using two orthogonal coupled oscillators

Detalhes bibliográficos
Autor(a) principal: Brennan, Michael J. [UNESP]
Data de Publicação: 2016
Outros Autores: Kamesh, Punithavathy
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1177/0954406215578701
http://hdl.handle.net/11449/168458
Resumo: It has been known for many years that rotating machinery with hydrodynamic oil-film bearings can exhibit oil-whirl instability, where the unidirectional oil-film force acts on the rotor causing it to vibrate at a natural frequency. In this article, this phenomenon is investigated using two orthogonal coupled oscillators in which the bearing is modeled using short-bearing theory and an oscillating € oil-film to account for cavitation. It is found that at the point of instability, energy is extracted from the oil-film by one of the oscillators, and this energy is dissipated by the other one, such that there is no net energy gain or loss from the system. When the steady-state eccentricity ratio is such that the whirl frequency goes to zero, the oscillators effectively become undamped so that there is no energy exchange between them, and the system is stable.
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spelling A perspective on oil-whirl using two orthogonal coupled oscillatorsbearingsdynamicshydrodynamicsindustrial machinesVibration theoryIt has been known for many years that rotating machinery with hydrodynamic oil-film bearings can exhibit oil-whirl instability, where the unidirectional oil-film force acts on the rotor causing it to vibrate at a natural frequency. In this article, this phenomenon is investigated using two orthogonal coupled oscillators in which the bearing is modeled using short-bearing theory and an oscillating € oil-film to account for cavitation. It is found that at the point of instability, energy is extracted from the oil-film by one of the oscillators, and this energy is dissipated by the other one, such that there is no net energy gain or loss from the system. When the steady-state eccentricity ratio is such that the whirl frequency goes to zero, the oscillators effectively become undamped so that there is no energy exchange between them, and the system is stable.Department of Mechanical Engineering UNESPInstitute of Sound and Vibration Research University of SouthamptonControls and Data Services Part of the Rolls-Royce GroupDepartment of Mechanical Engineering UNESPUniversidade Estadual Paulista (Unesp)University of SouthamptonPart of the Rolls-Royce GroupBrennan, Michael J. [UNESP]Kamesh, Punithavathy2018-12-11T16:41:21Z2018-12-11T16:41:21Z2016-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article500-505http://dx.doi.org/10.1177/0954406215578701Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, v. 230, n. 4, p. 500-505, 2016.2041-29830954-4062http://hdl.handle.net/11449/16845810.1177/09544062155787012-s2.0-84960155888Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science0,436info:eu-repo/semantics/openAccess2021-10-23T16:16:07Zoai:repositorio.unesp.br:11449/168458Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T16:16:07Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv A perspective on oil-whirl using two orthogonal coupled oscillators
title A perspective on oil-whirl using two orthogonal coupled oscillators
spellingShingle A perspective on oil-whirl using two orthogonal coupled oscillators
Brennan, Michael J. [UNESP]
bearings
dynamics
hydrodynamics
industrial machines
Vibration theory
title_short A perspective on oil-whirl using two orthogonal coupled oscillators
title_full A perspective on oil-whirl using two orthogonal coupled oscillators
title_fullStr A perspective on oil-whirl using two orthogonal coupled oscillators
title_full_unstemmed A perspective on oil-whirl using two orthogonal coupled oscillators
title_sort A perspective on oil-whirl using two orthogonal coupled oscillators
author Brennan, Michael J. [UNESP]
author_facet Brennan, Michael J. [UNESP]
Kamesh, Punithavathy
author_role author
author2 Kamesh, Punithavathy
author2_role author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
University of Southampton
Part of the Rolls-Royce Group
dc.contributor.author.fl_str_mv Brennan, Michael J. [UNESP]
Kamesh, Punithavathy
dc.subject.por.fl_str_mv bearings
dynamics
hydrodynamics
industrial machines
Vibration theory
topic bearings
dynamics
hydrodynamics
industrial machines
Vibration theory
description It has been known for many years that rotating machinery with hydrodynamic oil-film bearings can exhibit oil-whirl instability, where the unidirectional oil-film force acts on the rotor causing it to vibrate at a natural frequency. In this article, this phenomenon is investigated using two orthogonal coupled oscillators in which the bearing is modeled using short-bearing theory and an oscillating € oil-film to account for cavitation. It is found that at the point of instability, energy is extracted from the oil-film by one of the oscillators, and this energy is dissipated by the other one, such that there is no net energy gain or loss from the system. When the steady-state eccentricity ratio is such that the whirl frequency goes to zero, the oscillators effectively become undamped so that there is no energy exchange between them, and the system is stable.
publishDate 2016
dc.date.none.fl_str_mv 2016-03-01
2018-12-11T16:41:21Z
2018-12-11T16:41:21Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1177/0954406215578701
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, v. 230, n. 4, p. 500-505, 2016.
2041-2983
0954-4062
http://hdl.handle.net/11449/168458
10.1177/0954406215578701
2-s2.0-84960155888
url http://dx.doi.org/10.1177/0954406215578701
http://hdl.handle.net/11449/168458
identifier_str_mv Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, v. 230, n. 4, p. 500-505, 2016.
2041-2983
0954-4062
10.1177/0954406215578701
2-s2.0-84960155888
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
0,436
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 500-505
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1803650261071167488

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