On the Instability Threshold of Journal Bearing Supported Rotors
Journal bearing supported rotors present two kinds of self-excited vibrations: oil-whirl and oil-whip. The first one is commonly masked by the rotor unbalance, hence being rarely associated with instability problems. Oil-whip is a severe vibration which occurs when the oil-whirl frequency coincides...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2014/351261 |
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| author | Ricardo Ugliara Mendes Katia Lucchesi Cavalca |
| author_facet | Ricardo Ugliara Mendes Katia Lucchesi Cavalca |
| author_sort | Ricardo Ugliara Mendes |
| collection | DOAJ |
| description | Journal bearing supported rotors present two kinds of self-excited vibrations: oil-whirl and oil-whip. The first one is commonly masked by the rotor unbalance, hence being rarely associated with instability problems. Oil-whip is a severe vibration which occurs when the oil-whirl frequency coincides with the first flexural natural frequency of the shaft. In many cases, oil-whip is the only fluid-induced instability considered during the design stage; however, experimental evidences have shown that the instability threshold may occur much sooner, demanding a better comprehension of the instability mechanism. In this context, numerical simulations were made in order to improve the identification of the instability threshold for two test rig configurations: one on which the instability occurs on the oil-whip frequency, and another which became unstable before this threshold. Therefore, the main contribution of this paper is to present an investigation of two different thresholds of fluid-induced instabilities and their detectability on design stage simulations based on rotordynamic analysis using linear speed dependent coefficients for the bearings. |
| format | Article |
| id | doaj-art-c7333c3fe0bd434db8f7f2634ae42062 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-c7333c3fe0bd434db8f7f2634ae420622025-02-03T01:31:04ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342014-01-01201410.1155/2014/351261351261On the Instability Threshold of Journal Bearing Supported RotorsRicardo Ugliara Mendes0Katia Lucchesi Cavalca1Laboratory of Rotating Machinery, Department of Mechanical Design, Faculty of Mechanical Engineering, University of Campinas, 200 Mendeleiev Street, 13083-970 Campinas, SP, BrazilLaboratory of Rotating Machinery, Department of Mechanical Design, Faculty of Mechanical Engineering, University of Campinas, 200 Mendeleiev Street, 13083-970 Campinas, SP, BrazilJournal bearing supported rotors present two kinds of self-excited vibrations: oil-whirl and oil-whip. The first one is commonly masked by the rotor unbalance, hence being rarely associated with instability problems. Oil-whip is a severe vibration which occurs when the oil-whirl frequency coincides with the first flexural natural frequency of the shaft. In many cases, oil-whip is the only fluid-induced instability considered during the design stage; however, experimental evidences have shown that the instability threshold may occur much sooner, demanding a better comprehension of the instability mechanism. In this context, numerical simulations were made in order to improve the identification of the instability threshold for two test rig configurations: one on which the instability occurs on the oil-whip frequency, and another which became unstable before this threshold. Therefore, the main contribution of this paper is to present an investigation of two different thresholds of fluid-induced instabilities and their detectability on design stage simulations based on rotordynamic analysis using linear speed dependent coefficients for the bearings.http://dx.doi.org/10.1155/2014/351261 |
| spellingShingle | Ricardo Ugliara Mendes Katia Lucchesi Cavalca On the Instability Threshold of Journal Bearing Supported Rotors International Journal of Rotating Machinery |
| title | On the Instability Threshold of Journal Bearing Supported Rotors |
| title_full | On the Instability Threshold of Journal Bearing Supported Rotors |
| title_fullStr | On the Instability Threshold of Journal Bearing Supported Rotors |
| title_full_unstemmed | On the Instability Threshold of Journal Bearing Supported Rotors |
| title_short | On the Instability Threshold of Journal Bearing Supported Rotors |
| title_sort | on the instability threshold of journal bearing supported rotors |
| url | http://dx.doi.org/10.1155/2014/351261 |
| work_keys_str_mv | AT ricardougliaramendes ontheinstabilitythresholdofjournalbearingsupportedrotors AT katialucchesicavalca ontheinstabilitythresholdofjournalbearingsupportedrotors |