Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
Case study of resonance phenomena in a vertial hydropower unit
Vattenfall Research & Development.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0001-6016-6342
2008 (English)In: ISROMAC-12: the Twelfth International Symposium on Transport Phenomena and Dynamics of Rotating Machinery ; Honolulu, Hawaii, February 17 - 22, 2008, Pacific Center of Thermal-Fluids Engineering, Honolulu, 2008Conference paper, Published paper (Refereed)
Abstract [en]

In 2005 a vertical 42 MW hydropower unit was upgraded in Sweden. One of the requirements was that the dynamic behaviour of the machine should not be affected. Resonance problems became apparent after the hydropower unit was re-commissioned and, in order to remedy this, new measurements and calculations were undertaken. While measuring, the machine went into resonance twice. During normal operation the shaft displacement showed high amplitudes at a frequency of twice the machine's nominal speed. At resonance the displacement amplitude increased and a dominant frequency occurred at ~2.4x nominal speed. To explain the reason for the resonances, new rotor dynamic calculations were performed using non-isotropic bearing and bracket properties. This model showed good correlation between calculated and measured values for the lowest eigenfrequencies. Probable explanations for the resonance are shape deviation in the generator, misalignment of the shaft and low damping of some critical eigenfrequencies close to twice the nominal speed.

Place, publisher, year, edition, pages
Honolulu, 2008.
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-37897Local ID: c1625840-fb8a-11de-bae5-000ea68e967bOAI: oai:DiVA.org:ltu-37897DiVA: diva2:1011395
Conference
International Symposium on Transport Phenomena and Dynamics of Rotating Machinery : 17/02/2008 - 22/02/2008
Note
Godkänd; 2008; Bibliografisk uppgift: 1 CD-ROM; 20100107 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-10-19Bibliographically approved

Open Access in DiVA

fulltext(294 kB)53 downloads
File information
File name FULLTEXT01.pdfFile size 294 kBChecksum SHA-512
0c24fcb845e1b3a73308314e3b6c4a42531cb2e7628d0c3269df4dc868dbbf48b53dce2fde28f17c48dc1bb325bb4f51af902e25b6f56e6526e90f4c2bba30b7
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Nässelqvist, MattiasAidanpää, Jan-Olov
By organisation
Mechanics of Solid Materials
Applied Mechanics

Search outside of DiVA

GoogleGoogle Scholar
Total: 53 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 16 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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