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
STIFFNESS ASSESSMENT OF TRANSITION PIECE ON HYBRID WIND TOWER: EIGENFREQUENCY ANALYSIS OF FINITE ELEMENT MODELS
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A transition piece has responsibility to transmit forces from one member to another member. But when doing it, the transition piece must be stiff enough. Studying what parameter of the transition piece is contributing to the stiffness the most, will give economic advantages. Studies on the stiffness when introducing a transition piece on a hybrid tower will be carried out with an analytical procedure through Finite element method, with the software Abaqus. A linear perturbation, with a frequency step where extraction of the eigenfrequency value will be obtained. The value will reflect the stiffness of the structure, because it has a linear relation between each other. Higher eigenfrequency means higher stiffness and vice versa. The first model (Case A) is model of a fixed tubular tower. The frequency of case A is desired because it’s stiff at the bottom. Therefore a comparison has been made when introducing the transition piece.The eigenfrequency of the tubular tower (Case A) is 0,36765 Hz. And The eigenfrequency of the structure (Case D) is 0,21964 Hz, which make a stiffness reduction of 40,3 % when introducing the transition piece. 60,6 % of the total reduction is due to the bridging ring. The most efficient change on the bridging ring that will obtain a higher stiffness on the entire structure is to increase mid-plates layers.

Place, publisher, year, edition, pages
2017.
National Category
Other Civil Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-65308OAI: oai:DiVA.org:ltu-65308DiVA, id: diva2:1135988
Educational program
Civil Engineering, master's level
Supervisors
Examiners
Available from: 2017-12-15 Created: 2017-08-24 Last updated: 2017-12-15Bibliographically approved

Open Access in DiVA

fulltext(3539 kB)45 downloads
File information
File name FULLTEXT01.pdfFile size 3539 kBChecksum SHA-512
5c67eaf95c7877499910bd64219df1faf53855addcc5ddd010e95dcaf2b69361c1b93218a1fe34f4917d41397a94779f45c43c7ceaf82c8c9b57ccb2ff597788
Type fulltextMimetype application/pdf

By organisation
Structural and Construction Engineering
Other Civil Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 45 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

urn-nbn

Altmetric score

urn-nbn
Total: 69 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