Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Shaft vibrations in a vertical axis kaplan turbine: an FFT analysis
2001 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This report is an analysis of the relation between shaft vibrations and draft tube pressure pulsations in a hydroelectric power plant. Stave Falls is located about 65 km east of Vancouver, Canada. The original powerhouse was built in 1912 and eventually housed 5 horizontal double runner Francis turbines. The plant was decommissioned in 2000. Between 1995 and 2000 a new 90 MW hydroelectric power plant was constructed. The two new vertical Kaplan turbines were designed to operate from 10 to 45.9 MW on cam. Vibration measurements done to the units during commissioning showed that below 17 MW the shaft vibration increased above what was contractually specified. Some investigations have been done but no definitive cause of the vibrations has been found. The vibration problem included both of the units, and since they are identical in design, this new vibration analysis was performed on Unit 1 only. For this analysis pressure transducers were installed in existing taps above the runner, under the runner and in the spiral case. An accelerometer was placed on the draft tube cone, and signals were from the permanently installed vibration equipment installed in the turbine guide bearing. During the test, the signals from the pressure transducers and the vibration probes was recorded on a digital cassette, and thereafter analysed in an FFT- Analyser. In the analysis of the result could be found some pressure pulsation frequencies that are similar as the vibration frequencies of the shaft. These frequencies might be related to the vibration frequencies of the shaft at the turbine guide bearing. Even if the frequencies are similar it do not say that they are related. Further investigation has to be done to be certain of if there is a relation between the frequencies that has been found. And if so, what and where is the source of these frequencies and what can be done to eliminate or reduce their effect?

Place, publisher, year, edition, pages
2001.
Keyword [en]
Technology, Vibrationer, Maskinvibrationer, Axelvibrationer, Styrlager, FFT-analys
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-53847ISRN: LTU-HIP-EX--01/68--SELocal ID: ad80518f-3edd-45ac-bb05-70f06855936fOAI: oai:DiVA.org:ltu-53847DiVA: diva2:1027224
Subject / course
Student thesis, at least 15 credits
Educational program
Hydropower Engineering, bachelor's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

No full text

Search outside of DiVA

GoogleGoogle Scholar

Total: 29 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf