Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators
Based on experimental observations on a set of twenty 700 MW hydrogenerators, compiled from several technical reports issued over the last three decades and collected from the reprocessing of the vibration signals recorded during the last commissioning tests, this paper shows that the accurate deter...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2017/1805051 |
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| _version_ | 1849308448335855616 |
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| author | Geraldo Carvalho Brito Junior Roberto Dalledone Machado Anselmo Chaves Neto Mateus Feiertag Martini |
| author_facet | Geraldo Carvalho Brito Junior Roberto Dalledone Machado Anselmo Chaves Neto Mateus Feiertag Martini |
| author_sort | Geraldo Carvalho Brito Junior |
| collection | DOAJ |
| description | Based on experimental observations on a set of twenty 700 MW hydrogenerators, compiled from several technical reports issued over the last three decades and collected from the reprocessing of the vibration signals recorded during the last commissioning tests, this paper shows that the accurate determination of the journal bearings operating conditions may be a difficult task. It shows that the outsize bearing brackets of large hydrogenerators are subject to substantial dimensional changes caused by external agents, like the generator electromagnetic field and the bearing cooling water temperature. It also shows that the shaft eccentricity of a journal bearing of a healthy large hydrogenerator, operating in steady-state condition, may experience unpredictable, sudden, and significant changes without apparent reasons. Some of these phenomena are reproduced in ordinary commissioning tests or may be noticed even during normal operation, while others are rarely observed or are only detected through special tests. These phenomena modify journal bearings stiffness and damping, changing the hydrogenerator dynamics, creating discrepancies between theoretical predictions and experimental measurements, and making damage detection and diagnostics difficult. Therefore, these phenomena must be analyzed and considered in the application of vibration-based condition monitoring to these rotating machines. |
| format | Article |
| id | doaj-art-0b1cf0b479264053b8347a37ac2c8a62 |
| 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-0b1cf0b479264053b8347a37ac2c8a622025-08-20T03:54:28ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342017-01-01201710.1155/2017/18050511805051Experimental Aspects in the Vibration-Based Condition Monitoring of Large HydrogeneratorsGeraldo Carvalho Brito Junior0Roberto Dalledone Machado1Anselmo Chaves Neto2Mateus Feiertag Martini3Center for Engineering and Exact Sciences, Western Paraná State University (UNIOESTE), Foz do Iguaçu, PR, BrazilNumerical Methods for Engineering Graduate Program, Federal University of Paraná (UFPR), Curitiba, PR, BrazilNumerical Methods for Engineering Graduate Program, Federal University of Paraná (UFPR), Curitiba, PR, BrazilCenter for Engineering and Exact Sciences, Western Paraná State University (UNIOESTE), Foz do Iguaçu, PR, BrazilBased on experimental observations on a set of twenty 700 MW hydrogenerators, compiled from several technical reports issued over the last three decades and collected from the reprocessing of the vibration signals recorded during the last commissioning tests, this paper shows that the accurate determination of the journal bearings operating conditions may be a difficult task. It shows that the outsize bearing brackets of large hydrogenerators are subject to substantial dimensional changes caused by external agents, like the generator electromagnetic field and the bearing cooling water temperature. It also shows that the shaft eccentricity of a journal bearing of a healthy large hydrogenerator, operating in steady-state condition, may experience unpredictable, sudden, and significant changes without apparent reasons. Some of these phenomena are reproduced in ordinary commissioning tests or may be noticed even during normal operation, while others are rarely observed or are only detected through special tests. These phenomena modify journal bearings stiffness and damping, changing the hydrogenerator dynamics, creating discrepancies between theoretical predictions and experimental measurements, and making damage detection and diagnostics difficult. Therefore, these phenomena must be analyzed and considered in the application of vibration-based condition monitoring to these rotating machines.http://dx.doi.org/10.1155/2017/1805051 |
| spellingShingle | Geraldo Carvalho Brito Junior Roberto Dalledone Machado Anselmo Chaves Neto Mateus Feiertag Martini Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators International Journal of Rotating Machinery |
| title | Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators |
| title_full | Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators |
| title_fullStr | Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators |
| title_full_unstemmed | Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators |
| title_short | Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators |
| title_sort | experimental aspects in the vibration based condition monitoring of large hydrogenerators |
| url | http://dx.doi.org/10.1155/2017/1805051 |
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