Effects of the Hot Alignment of a Power Unit on Oil-Whip Instability Phenomena
This paper shows the results of the analysis of the dynamic behaviour of a power unit, whose shaft-train alignment was significantly influenced by the machine thermal state, that was affected in operating condition by high subsynchronous vibrations caused by oil-whip instability phenomena. The dynam...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Wiley
2010-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2010/385947 |
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| _version_ | 1832553757636820992 |
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| author | A. Vania P. Pennacchi |
| author_facet | A. Vania P. Pennacchi |
| author_sort | A. Vania |
| collection | DOAJ |
| description | This paper shows the results of the analysis of the dynamic behaviour of a power unit, whose shaft-train alignment was significantly influenced by the machine thermal state, that was affected in operating condition by high subsynchronous vibrations caused by oil-whip instability phenomena. The dynamic stiffness coefficients of the oil-film journal bearings of the generator were evaluated considering the critical average journal positions that caused the instability onsets. By including these bearing coefficients in a mathematical model of the fully assembled machine, the real part of the eigenvalue associated with the first balance resonance of the generator rotor became positive. This paper shows the successful results obtained by combining diagnostic techniques based on mathematical models of journal bearings and shaft train with detailed analyses of monitoring data aimed to investigate the effects of the hot alignment of rotating machines on the occurrence of oil-whip instability onsets. |
| format | Article |
| id | doaj-art-77a8d183b0ae44f3ba34599691805c7e |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2010-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-77a8d183b0ae44f3ba34599691805c7e2025-02-03T05:53:17ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342010-01-01201010.1155/2010/385947385947Effects of the Hot Alignment of a Power Unit on Oil-Whip Instability PhenomenaA. Vania0P. Pennacchi1Politecnico di Milano, Dipartimento di Meccanica, Via La Masa, 1, 20156 Milano, ItalyPolitecnico di Milano, Dipartimento di Meccanica, Via La Masa, 1, 20156 Milano, ItalyThis paper shows the results of the analysis of the dynamic behaviour of a power unit, whose shaft-train alignment was significantly influenced by the machine thermal state, that was affected in operating condition by high subsynchronous vibrations caused by oil-whip instability phenomena. The dynamic stiffness coefficients of the oil-film journal bearings of the generator were evaluated considering the critical average journal positions that caused the instability onsets. By including these bearing coefficients in a mathematical model of the fully assembled machine, the real part of the eigenvalue associated with the first balance resonance of the generator rotor became positive. This paper shows the successful results obtained by combining diagnostic techniques based on mathematical models of journal bearings and shaft train with detailed analyses of monitoring data aimed to investigate the effects of the hot alignment of rotating machines on the occurrence of oil-whip instability onsets.http://dx.doi.org/10.1155/2010/385947 |
| spellingShingle | A. Vania P. Pennacchi Effects of the Hot Alignment of a Power Unit on Oil-Whip Instability Phenomena International Journal of Rotating Machinery |
| title | Effects of the Hot Alignment of a Power Unit on Oil-Whip Instability Phenomena |
| title_full | Effects of the Hot Alignment of a Power Unit on Oil-Whip Instability Phenomena |
| title_fullStr | Effects of the Hot Alignment of a Power Unit on Oil-Whip Instability Phenomena |
| title_full_unstemmed | Effects of the Hot Alignment of a Power Unit on Oil-Whip Instability Phenomena |
| title_short | Effects of the Hot Alignment of a Power Unit on Oil-Whip Instability Phenomena |
| title_sort | effects of the hot alignment of a power unit on oil whip instability phenomena |
| url | http://dx.doi.org/10.1155/2010/385947 |
| work_keys_str_mv | AT avania effectsofthehotalignmentofapowerunitonoilwhipinstabilityphenomena AT ppennacchi effectsofthehotalignmentofapowerunitonoilwhipinstabilityphenomena |