Transportation and Installation of the TetraSpar Floating Offshore Wind Turbine
Authors
Gonzalez Leon, Cristino Manuel ; Martin, Nils Gilbert Karl ; Villaespesa, Eduardo Benitez
Term
4. term
Education
Publication year
2018
Submitted on
2018-06-15
Pages
80
Abstract
Efterhånden som havvind rykker mod dybere farvande, bliver flydende fundamenter centrale for at reducere omkostninger og udvide markedet. Dette speciale undersøger transport og installation af TetraSpar, et innovativt flydende fundament, der kombinerer principper fra spar-, semi-sub- og TLP-koncepter og befinder sig på Technology Readiness Level 6. Indtil nu er kun den fuldt installerede struktur testet; her adresseres videnshullet fra søsætning i havn til driftsfase gennem fire trin: bugsering, hook-up, sænkning og ballastning af modvægt. Specialets hovedspørgsmål er, hvordan modvægtsplacering og bugseringsretning påvirker den hydrodynamiske respons og sikkerhed, samt hvilke procedurer der muliggør sikker og effektiv installation under de dimensionerende miljøforhold. Metodisk bygger arbejdet på eksperimentelle skalaforsøg med bugserings- og installationsvurderinger, suppleret af numeriske og analytiske analyser af strømkræfter og dynamisk respons. På den baggrund udvælges en transportkonfiguration til detaljeret installationsstudie, strukturens bevægelser og laster vurderes i relevante søtilstande, og der gives praktiske anbefalinger for transport og installation af TetraSpar. Konkrete kvantitative resultater er ikke gengivet i uddraget, men specialet sigter mod at dokumentere sikkerhed inden for de fastlagte miljøbetingelser og at støtte industrialiseret udrulning af flydende havvind.
As offshore wind expands into deeper waters, floating foundations are key to cutting costs and unlocking new sites. This thesis investigates the transportation and installation of TetraSpar, an innovative floating foundation that combines features of spar, semi-submersible, and tension-leg concepts and is currently at Technology Readiness Level 6. To date, only the fully installed structure has been tested; this work addresses the gap from harbor launch to operation across four stages: tow-out, hook-up, lowering, and ballasting of the counterweight. The central question is how counterweight placement and towing direction affect hydrodynamic response and safety, and which procedures enable safe, efficient installation under the design environmental conditions. The study employs experimental scale-model tests for towing and installation assessments, complemented by numerical and analytical analyses of current forces and dynamic response. Based on these analyses, a transportation configuration is selected for detailed installation study, motions and loads are evaluated in relevant sea states, and practical recommendations are provided for the transport and installation of TetraSpar. While detailed quantitative findings are not included in this excerpt, the work aims to demonstrate safety within specified environmental limits and to support the industrialization of floating offshore wind.
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