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Hydroelastic Analysis of a Hybrid-Type VLFS in Water of Variable Depth

[+] Author Affiliations
Tomoaki Utsunomiya, Eiichi Watanabe

Kyoto University, Kyoto, Japan

Takatoshi Noguchi

Ministry of Land, Infrastructure, Transport and Tourism, Yokohama, Japan

Syuji Yamamoto

Coastal Development Institute of Technology, Tokyo, Japan

Tadasu Kusaka, Tatsunori Ogamo

Chuden Engineering Consultants Co., Ltd., Hiroshima, Japan

Paper No. OMAE2008-57180, pp. 733-742; 10 pages
doi:10.1115/OMAE2008-57180
From:
  • ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology; Ocean Space Utilization
  • Estoril, Portugal, June 15–20, 2008
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4820-3 | eISBN: 0-7918-3821-8
  • Copyright © 2008 by ASME

abstract

This paper presents a hydroelastic analysis of a hybrid-type VLFS in variable sea depth. The VLFS model is the prototype of a floating runway with dimension 3120m in length, 524m in width, 1.5m in draft for pontoon part and 11.5m in draft for semisubmersible part. A three dimensional Finite Element model using beams and quadrilateral plate elements are used in the hydroelastic analysis in order to obtain an accurate approximation. An equivalent plate model having the same eigenfrequencies and eigenmodes in air is also used in the analysis. The results using the 3D model and the plate model have been compared and their agreement is satisfying. In order to examine the variable sea depth at the expected site, the hydroelastic analysis is carried out for a flat bottom, a constant slope, and a variable sea depth case. The effect of variable sea depth is found to be significant.

Copyright © 2008 by ASME

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