A perspective on oil-whirl using two orthogonal coupled oscillators
Autor(a) principal: | |
---|---|
Data de Publicação: | 2016 |
Outros Autores: | |
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. |
id |
UNSP_c8a91c3bb42d34d63817baa76bcb4390 |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/168458 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
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:29462024-08-05T23:00:56.260954Repositório 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_ |
1808129482254450688 |