Vibration responses of a two-span three-support rotor system with sliding bearing elevation change
<p>The two-span three-support rotor is a typical structure in rotating machinery such as steam turbines and water pumps. The alteration in bearing elevation can result in oil film instability, rotor rub impact, and other malfunctions. In extreme cases, this can cause excessive wear of coupling...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2025-07-01
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| Series: | Mechanical Sciences |
| Online Access: | https://ms.copernicus.org/articles/16/375/2025/ms-16-375-2025.pdf |
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| author | Z. Zhou G. Bin C. Li Y. Gao M. Bayjid Md |
| author_facet | Z. Zhou G. Bin C. Li Y. Gao M. Bayjid Md |
| author_sort | Z. Zhou |
| collection | DOAJ |
| description | <p>The two-span three-support rotor is a typical structure in rotating machinery such as steam turbines and water pumps. The alteration in bearing elevation can result in oil film instability, rotor rub impact, and other malfunctions. In extreme cases, this can cause excessive wear of couplings and other components, leading to accidents. This study derives the dynamic equation of a two-span three-support rotor that accounts for variations in bearing elevation. Meanwhile, the influence of different sliding bearing elevations on the misalignment excitation of the coupling and the stiffness damping coefficient of the bearing is considered, and the vibration response of each bearing is also investigated. Corresponding experiments are designed and conducted to validate the findings. The findings indicate that after raising the elevation of bearing 3 from 1.5 to 2 mm, the amplitude of the fundamental frequency (<span class="inline-formula">1×</span>) at bearing 2 is reduced by 438 %, whereas the amplitude at the second harmonic (<span class="inline-formula">2×</span>) is increased by 128 %. This increase in misalignment excitation causes the axis orbit of disk 1 to change from a crescent shape to a petal shape. This study offers theoretical insights and empirical data that may assist in the structural design and fault diagnosis of two-span three-support rotors.</p> |
| format | Article |
| id | doaj-art-87f8179007cd41e094f5b6b035b57891 |
| institution | Kabale University |
| issn | 2191-9151 2191-916X |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Mechanical Sciences |
| spelling | doaj-art-87f8179007cd41e094f5b6b035b578912025-08-20T03:28:18ZengCopernicus PublicationsMechanical Sciences2191-91512191-916X2025-07-011637539010.5194/ms-16-375-2025Vibration responses of a two-span three-support rotor system with sliding bearing elevation changeZ. Zhou0G. Bin1C. Li2Y. Gao3M. Bayjid Md4Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, ChinaHunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, ChinaHunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, ChinaHunan Electric Power Co Ltd, Xiangtan 411201, ChinaHunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China<p>The two-span three-support rotor is a typical structure in rotating machinery such as steam turbines and water pumps. The alteration in bearing elevation can result in oil film instability, rotor rub impact, and other malfunctions. In extreme cases, this can cause excessive wear of couplings and other components, leading to accidents. This study derives the dynamic equation of a two-span three-support rotor that accounts for variations in bearing elevation. Meanwhile, the influence of different sliding bearing elevations on the misalignment excitation of the coupling and the stiffness damping coefficient of the bearing is considered, and the vibration response of each bearing is also investigated. Corresponding experiments are designed and conducted to validate the findings. The findings indicate that after raising the elevation of bearing 3 from 1.5 to 2 mm, the amplitude of the fundamental frequency (<span class="inline-formula">1×</span>) at bearing 2 is reduced by 438 %, whereas the amplitude at the second harmonic (<span class="inline-formula">2×</span>) is increased by 128 %. This increase in misalignment excitation causes the axis orbit of disk 1 to change from a crescent shape to a petal shape. This study offers theoretical insights and empirical data that may assist in the structural design and fault diagnosis of two-span three-support rotors.</p>https://ms.copernicus.org/articles/16/375/2025/ms-16-375-2025.pdf |
| spellingShingle | Z. Zhou G. Bin C. Li Y. Gao M. Bayjid Md Vibration responses of a two-span three-support rotor system with sliding bearing elevation change Mechanical Sciences |
| title | Vibration responses of a two-span three-support rotor system with sliding bearing elevation change |
| title_full | Vibration responses of a two-span three-support rotor system with sliding bearing elevation change |
| title_fullStr | Vibration responses of a two-span three-support rotor system with sliding bearing elevation change |
| title_full_unstemmed | Vibration responses of a two-span three-support rotor system with sliding bearing elevation change |
| title_short | Vibration responses of a two-span three-support rotor system with sliding bearing elevation change |
| title_sort | vibration responses of a two span three support rotor system with sliding bearing elevation change |
| url | https://ms.copernicus.org/articles/16/375/2025/ms-16-375-2025.pdf |
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