Study on Parametric Excitation of a Spar Platform

• ABE Kumiko

  京都大学工学部

• UTSUNOMIYA Tomoaki

  京都大学大学院工学研究科

Bibliographic Information

Other Title

• スパー型浮体におけるパラメータ励振に関する研究

Abstract

A floating offshore wind tubine using spar platform as the floating foundation is considered here. It is known that a spar platform may show Mathiew instability in its dynamic motions. This is because the equations of motions in heave and pitch directions couple each other, and the equation of motion in pitch direction reduces to Mathiew equation in its approximated form.<br>In this paper, we propose a stability diagram of the parametric excitation for a spar platform, where the effects of damping and wave elevation are both considered. Then, the applicability of the derived stability diagram is validated by numerical examples using a spar platform model, where the upper part of the spar has a reduced diameter. Some design guidelines concerning the ratio of pitch/heave natural periods are also given.

Journal

• Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))

  Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 68 (2), I_813-I_822, 2012

  Japan Society of Civil Engineers

Keywords

• floating wind turbine
• spar platform
• Mathieu instability
• parametric excitation

Details

• CRID: 1390282680327433216
• NII Article ID: 130004557329
• DOI: 10.2208/jscejam.68.i_813
• ISSN: 21854661
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed