Influence of Varnish on Bearing Performance and Vibration of Rotating Machinery
Varnish is a kind of fouling adhered on bearing inner face near the load zone. The model to analyze its influence on bearing performance and rotor vibration was set up. Pressure and temperature distribution were solved on the basis of the Reynolds equation by the iteration method simultaneously. It...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2017-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2017/9131275 |
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| _version_ | 1832548335760703488 |
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| author | Chu Zhang Jian-Gang Yang Shi Liu Qing-Shui Gao Yi Yang |
| author_facet | Chu Zhang Jian-Gang Yang Shi Liu Qing-Shui Gao Yi Yang |
| author_sort | Chu Zhang |
| collection | DOAJ |
| description | Varnish is a kind of fouling adhered on bearing inner face near the load zone. The model to analyze its influence on bearing performance and rotor vibration was set up. Pressure and temperature distribution were solved on the basis of the Reynolds equation by the iteration method simultaneously. It is found that bearing performance is changed by the step flow effect at the leading edge of the varnish. Its influence is more obvious when the rotating speed is low. Bearing varnish results in a large decrease of minimum clearance and an increase in the oil film temperature and pressure. Loading capacity of bearing is also decreased. It is harmful to the bearing. With the varnish, the minimum oil film thickness decreases. This leads to an increase of bearing stiffness and damping coefficients. Its influence is larger in the horizontal direction than that in the vertical direction. The trend of unbalance response to rotating speed is similar. There is little influence of the varnish on the modal frequency. However, system stability is improved due to the increased bearing damping coefficients. |
| format | Article |
| id | doaj-art-7bbdb5bf4adf49988717bfd4281802f6 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-7bbdb5bf4adf49988717bfd4281802f62025-02-03T06:14:18ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342017-01-01201710.1155/2017/91312759131275Influence of Varnish on Bearing Performance and Vibration of Rotating MachineryChu Zhang0Jian-Gang Yang1Shi Liu2Qing-Shui Gao3Yi Yang4Electric Power Research Institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, ChinaNational Engineering Research Center of Turbo-Generator Vibration, Southeast University, Nanjing 210096, ChinaElectric Power Research Institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, ChinaElectric Power Research Institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, ChinaElectric Power Research Institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, ChinaVarnish is a kind of fouling adhered on bearing inner face near the load zone. The model to analyze its influence on bearing performance and rotor vibration was set up. Pressure and temperature distribution were solved on the basis of the Reynolds equation by the iteration method simultaneously. It is found that bearing performance is changed by the step flow effect at the leading edge of the varnish. Its influence is more obvious when the rotating speed is low. Bearing varnish results in a large decrease of minimum clearance and an increase in the oil film temperature and pressure. Loading capacity of bearing is also decreased. It is harmful to the bearing. With the varnish, the minimum oil film thickness decreases. This leads to an increase of bearing stiffness and damping coefficients. Its influence is larger in the horizontal direction than that in the vertical direction. The trend of unbalance response to rotating speed is similar. There is little influence of the varnish on the modal frequency. However, system stability is improved due to the increased bearing damping coefficients.http://dx.doi.org/10.1155/2017/9131275 |
| spellingShingle | Chu Zhang Jian-Gang Yang Shi Liu Qing-Shui Gao Yi Yang Influence of Varnish on Bearing Performance and Vibration of Rotating Machinery International Journal of Rotating Machinery |
| title | Influence of Varnish on Bearing Performance and Vibration of Rotating Machinery |
| title_full | Influence of Varnish on Bearing Performance and Vibration of Rotating Machinery |
| title_fullStr | Influence of Varnish on Bearing Performance and Vibration of Rotating Machinery |
| title_full_unstemmed | Influence of Varnish on Bearing Performance and Vibration of Rotating Machinery |
| title_short | Influence of Varnish on Bearing Performance and Vibration of Rotating Machinery |
| title_sort | influence of varnish on bearing performance and vibration of rotating machinery |
| url | http://dx.doi.org/10.1155/2017/9131275 |
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