The University of Southampton
University of Southampton Institutional Repository

Proxy model for the design of extensible floating offshore wind turbine mooring systems

Proxy model for the design of extensible floating offshore wind turbine mooring systems
Proxy model for the design of extensible floating offshore wind turbine mooring systems
Mooring systems for floating offshore wind turbines (FOWTs) are
designed to resist extreme loads, employing heavy mooring lines and
large anchors which contribute to high capital expenditure. Incorporating
extensible sections to mooring lines reduces peak dynamic
loading, enabling the use of smaller, easier to install and therefore
cheaper anchors. Finite element (F.E.) modelling of extensible mooring
lines is time consuming and is not well suited to optimization since
all the mooring line variables must be defined a priori. This paper
presents a quick and versatile approach to exploring the effect of linear
and non-linear stiffness extensible moorings on the FOWT system,
which can be used for automated optimization of one variable for
given constraints in the others. The proxy model was based on data
from fully-coupled F.E. analyses of the DeepCwind semi-submersible
FOWT. The proxy model is formed of numerical relationships between
environmental loads, fairlead tension, platform surge, and extensible
section design parameters (length L, axial stiffness EA). From these
relationships, the model can determine optimal extensible section
parameters which minimise fairlead tension for a given surge criterion,
or minimise surge for a given maximum tension criterion. When applied
to an example design scenario, results from the proxy model show good
agreement with F.E. results, with a maximum error of 1.2% for linear
stiffness results and 4.3% for non-linear stiffness section properties.
International Society of Offshore and Polar Engineers
Festa, Oscar, George
4710abfd-aa37-478e-98c8-21bc2e292384
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Sobey, Adam
e850606f-aa79-4c99-8682-2cfffda3cd28
Festa, Oscar, George
4710abfd-aa37-478e-98c8-21bc2e292384
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Sobey, Adam
e850606f-aa79-4c99-8682-2cfffda3cd28

Festa, Oscar, George, Gourvenec, Susan and Sobey, Adam (2022) Proxy model for the design of extensible floating offshore wind turbine mooring systems. In Proc. 32nd International Symposium on Ocean and Polar Engineering (ISOPE), June 5 – 10 (virtual). International Society of Offshore and Polar Engineers..

Record type: Conference or Workshop Item (Paper)

Abstract

Mooring systems for floating offshore wind turbines (FOWTs) are
designed to resist extreme loads, employing heavy mooring lines and
large anchors which contribute to high capital expenditure. Incorporating
extensible sections to mooring lines reduces peak dynamic
loading, enabling the use of smaller, easier to install and therefore
cheaper anchors. Finite element (F.E.) modelling of extensible mooring
lines is time consuming and is not well suited to optimization since
all the mooring line variables must be defined a priori. This paper
presents a quick and versatile approach to exploring the effect of linear
and non-linear stiffness extensible moorings on the FOWT system,
which can be used for automated optimization of one variable for
given constraints in the others. The proxy model was based on data
from fully-coupled F.E. analyses of the DeepCwind semi-submersible
FOWT. The proxy model is formed of numerical relationships between
environmental loads, fairlead tension, platform surge, and extensible
section design parameters (length L, axial stiffness EA). From these
relationships, the model can determine optimal extensible section
parameters which minimise fairlead tension for a given surge criterion,
or minimise surge for a given maximum tension criterion. When applied
to an example design scenario, results from the proxy model show good
agreement with F.E. results, with a maximum error of 1.2% for linear
stiffness results and 4.3% for non-linear stiffness section properties.

Text
2022-Festa_et_al_ISOPE - Author's Original
Download (2MB)

More information

Published date: 1 June 2022

Identifiers

Local EPrints ID: 457472
URI: http://eprints.soton.ac.uk/id/eprint/457472
PURE UUID: 7d15b17a-1e7a-4ff6-aa40-c6b52397d564
ORCID for Susan Gourvenec: ORCID iD orcid.org/0000-0002-2628-7914
ORCID for Adam Sobey: ORCID iD orcid.org/0000-0001-6880-8338

Catalogue record

Date deposited: 09 Jun 2022 16:54
Last modified: 10 Jun 2022 01:48

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×