Study on Thermal Unstable Vibration of Rotor under Journal Whirl with Large Amplitude in Journal Bearing
To investigate the thermal unstable vibration caused by journal whirls with large amplitude in journal bearing, an analysis model of lubricant film thickness is established. The journal surface temperature distribution is solved, and the reason for journal surface temperature difference appearance a...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2020/1980759 |
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| _version_ | 1832546900589412352 |
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| author | Qilong Hu Min Zhu Jiangang Yang |
| author_facet | Qilong Hu Min Zhu Jiangang Yang |
| author_sort | Qilong Hu |
| collection | DOAJ |
| description | To investigate the thermal unstable vibration caused by journal whirls with large amplitude in journal bearing, an analysis model of lubricant film thickness is established. The journal surface temperature distribution is solved, and the reason for journal surface temperature difference appearance and its influence on rotor vibration are analyzed. Taking a turbogenerator as an example, the journal surface temperature difference and the induced rotor thermal bending under synchronous whirl in the bearing are calculated. Meanwhile, an engineering vibration fault with its treatment is presented. Results show that, the journal surface circumferential temperature difference is caused by viscous shearing within lubricant film under journal whirls with large amplitude in journal bearing. The direction of temperature difference is related to the direction of unbalanced force acting on journal. The temperature difference causes rotor thermal bending, which can be converted to a thermal unbalance on the rotor. The rotor vibration is caused by both thermal and initial unbalance. When the rotor is running below or at the critical speed, the vibration is on the increase until it leads to instability of the rotor eventually. When the rotor is running above the critical speed, the rotor vibration fluctuates periodically. Reducing the initial (mechanical) unbalances decreases the rotor vibration and the journal surface circumferential temperature difference. |
| format | Article |
| id | doaj-art-baf26b8fa6094b51b2c92717185ef3b4 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-baf26b8fa6094b51b2c92717185ef3b42025-02-03T06:46:41ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342020-01-01202010.1155/2020/19807591980759Study on Thermal Unstable Vibration of Rotor under Journal Whirl with Large Amplitude in Journal BearingQilong Hu0Min Zhu1Jiangang Yang2National Engineering Research Center of Turbogenerator Vibration, Southeast University, Nanjing 210096, ChinaNational Engineering Research Center of Turbogenerator Vibration, Southeast University, Nanjing 210096, ChinaNational Engineering Research Center of Turbogenerator Vibration, Southeast University, Nanjing 210096, ChinaTo investigate the thermal unstable vibration caused by journal whirls with large amplitude in journal bearing, an analysis model of lubricant film thickness is established. The journal surface temperature distribution is solved, and the reason for journal surface temperature difference appearance and its influence on rotor vibration are analyzed. Taking a turbogenerator as an example, the journal surface temperature difference and the induced rotor thermal bending under synchronous whirl in the bearing are calculated. Meanwhile, an engineering vibration fault with its treatment is presented. Results show that, the journal surface circumferential temperature difference is caused by viscous shearing within lubricant film under journal whirls with large amplitude in journal bearing. The direction of temperature difference is related to the direction of unbalanced force acting on journal. The temperature difference causes rotor thermal bending, which can be converted to a thermal unbalance on the rotor. The rotor vibration is caused by both thermal and initial unbalance. When the rotor is running below or at the critical speed, the vibration is on the increase until it leads to instability of the rotor eventually. When the rotor is running above the critical speed, the rotor vibration fluctuates periodically. Reducing the initial (mechanical) unbalances decreases the rotor vibration and the journal surface circumferential temperature difference.http://dx.doi.org/10.1155/2020/1980759 |
| spellingShingle | Qilong Hu Min Zhu Jiangang Yang Study on Thermal Unstable Vibration of Rotor under Journal Whirl with Large Amplitude in Journal Bearing International Journal of Rotating Machinery |
| title | Study on Thermal Unstable Vibration of Rotor under Journal Whirl with Large Amplitude in Journal Bearing |
| title_full | Study on Thermal Unstable Vibration of Rotor under Journal Whirl with Large Amplitude in Journal Bearing |
| title_fullStr | Study on Thermal Unstable Vibration of Rotor under Journal Whirl with Large Amplitude in Journal Bearing |
| title_full_unstemmed | Study on Thermal Unstable Vibration of Rotor under Journal Whirl with Large Amplitude in Journal Bearing |
| title_short | Study on Thermal Unstable Vibration of Rotor under Journal Whirl with Large Amplitude in Journal Bearing |
| title_sort | study on thermal unstable vibration of rotor under journal whirl with large amplitude in journal bearing |
| url | http://dx.doi.org/10.1155/2020/1980759 |
| work_keys_str_mv | AT qilonghu studyonthermalunstablevibrationofrotorunderjournalwhirlwithlargeamplitudeinjournalbearing AT minzhu studyonthermalunstablevibrationofrotorunderjournalwhirlwithlargeamplitudeinjournalbearing AT jiangangyang studyonthermalunstablevibrationofrotorunderjournalwhirlwithlargeamplitudeinjournalbearing |