Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators
Joint Authors
Brito Junior, Geraldo Carvalho
Machado, Roberto Dalledone
Chaves Neto, Anselmo
Martini, Mateus Feiertag
Source
International Journal of Rotating Machinery
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-02-20
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
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.
American Psychological Association (APA)
Brito Junior, Geraldo Carvalho& Machado, Roberto Dalledone& Chaves Neto, Anselmo& Martini, Mateus Feiertag. 2017. Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators. International Journal of Rotating Machinery،Vol. 2017, no. 2017, pp.1-14.
https://search.emarefa.net/detail/BIM-1169479
Modern Language Association (MLA)
Brito Junior, Geraldo Carvalho…[et al.]. Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators. International Journal of Rotating Machinery No. 2017 (2017), pp.1-14.
https://search.emarefa.net/detail/BIM-1169479
American Medical Association (AMA)
Brito Junior, Geraldo Carvalho& Machado, Roberto Dalledone& Chaves Neto, Anselmo& Martini, Mateus Feiertag. Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators. International Journal of Rotating Machinery. 2017. Vol. 2017, no. 2017, pp.1-14.
https://search.emarefa.net/detail/BIM-1169479
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1169479