Offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs

A comparison study was conducted between a conventional four-legged and a newly-developed three-legged bottom fixed jacket substructure for offshore wind applications. Fatigue (FLS) and ultimate limit state (ULS) analyses were performed, and results show that the three-legged concept is feasible as...

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Main Authors: Chew, Kok Hon, Ng, E. Y. K., Tai, Kang, Muskulus, Michael, Zwick, Daniel
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2014
Subjects:
Online Access:https://hdl.handle.net/10356/100546
http://hdl.handle.net/10220/24149
http://www.isope.org/publications/jowe/jowe-01-2/abst-01-2-p074-jc-r-09-Chew.pdf
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Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-100546
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spelling sg-ntu-dr.10356-1005462021-01-05T06:43:44Z Offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs Chew, Kok Hon Ng, E. Y. K. Tai, Kang Muskulus, Michael Zwick, Daniel School of Mechanical and Aerospace Engineering DNV GL Energy Research Institute @ NTU (ERI@N) DRNTU::Engineering::Civil engineering::Structures and design DRNTU::Engineering::Mechanical engineering::Alternative, renewable energy sources A comparison study was conducted between a conventional four-legged and a newly-developed three-legged bottom fixed jacket substructure for offshore wind applications. Fatigue (FLS) and ultimate limit state (ULS) analyses were performed, and results show that the three-legged concept is feasible as an interesting alternative to the four-legged design, while potentially more cost-efficient, with a 17-percent reduction of structural mass and a 25-percent reduction in the number of welded joints. Further analyses were carried out to evaluate the sensitivity of the dynamic performance with respect to different load cases, loading directionality, and wind-wave misalignment effects. Results show that both designs are highly susceptible to the change-of-load direction, therefore recommending a finer incident angle resolution (a gap of 15 degrees or less) to be used in the analysis. The overall wind-wave misalignment effect is comparably smaller, but could contribute to a significant impact if the joints are close to being critical. EDB (Economic Devt. Board, S’pore) 2014-10-29T03:38:09Z 2019-12-06T20:24:16Z 2014-10-29T03:38:09Z 2019-12-06T20:24:16Z 2014 2014 Journal Article Chew, K. H., Ng, E. Y. K., Tai, K., Muskulus, M., & Zwick, D. (2014). Offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs. Journal of ocean and wind energy, 1(2), 74-81. 2310-3604 https://hdl.handle.net/10356/100546 http://hdl.handle.net/10220/24149 http://www.isope.org/publications/jowe/jowe-01-2/abst-01-2-p074-jc-r-09-Chew.pdf en Journal of ocean and wind energy © 2014 The International Society of Offshore and Polar Engineers. 8 p.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Structures and design
DRNTU::Engineering::Mechanical engineering::Alternative, renewable energy sources
spellingShingle DRNTU::Engineering::Civil engineering::Structures and design
DRNTU::Engineering::Mechanical engineering::Alternative, renewable energy sources
Chew, Kok Hon
Ng, E. Y. K.
Tai, Kang
Muskulus, Michael
Zwick, Daniel
Offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs
description A comparison study was conducted between a conventional four-legged and a newly-developed three-legged bottom fixed jacket substructure for offshore wind applications. Fatigue (FLS) and ultimate limit state (ULS) analyses were performed, and results show that the three-legged concept is feasible as an interesting alternative to the four-legged design, while potentially more cost-efficient, with a 17-percent reduction of structural mass and a 25-percent reduction in the number of welded joints. Further analyses were carried out to evaluate the sensitivity of the dynamic performance with respect to different load cases, loading directionality, and wind-wave misalignment effects. Results show that both designs are highly susceptible to the change-of-load direction, therefore recommending a finer incident angle resolution (a gap of 15 degrees or less) to be used in the analysis. The overall wind-wave misalignment effect is comparably smaller, but could contribute to a significant impact if the joints are close to being critical.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Chew, Kok Hon
Ng, E. Y. K.
Tai, Kang
Muskulus, Michael
Zwick, Daniel
format Article
author Chew, Kok Hon
Ng, E. Y. K.
Tai, Kang
Muskulus, Michael
Zwick, Daniel
author_sort Chew, Kok Hon
title Offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs
title_short Offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs
title_full Offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs
title_fullStr Offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs
title_full_unstemmed Offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs
title_sort offshore wind turbine jacket substructure : a comparison study between four-legged and three-legged designs
publishDate 2014
url https://hdl.handle.net/10356/100546
http://hdl.handle.net/10220/24149
http://www.isope.org/publications/jowe/jowe-01-2/abst-01-2-p074-jc-r-09-Chew.pdf
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