• Login
    View Item 
    •   Home
    • Theses & Dissertations
    • 2022 - Mines Theses & Dissertations
    • View Item
    •   Home
    • Theses & Dissertations
    • 2022 - Mines Theses & Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Mines RepositoryCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    Login

    Mines Links

    Arthur Lakes LibraryColorado School of Mines

    Statistics

    Display Statistics

    Structural assessment and platform actuation of a novel semi-submersible floating offshore wind turbine substructure

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Dinius_mines_0052N_12470.pdf
    Size:
    12.74Mb
    Format:
    PDF
    Download
    Author
    Dinius, James D.
    Advisor
    Johnson, Kathryn E.
    Damiani, Rick
    Date issued
    2022
    Keywords
    floating offshore wind energy
    renewable energy
    wind energy
    
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/11124/15517
    Abstract
    Floating offshore wind turbines (FOWTs) represent a valuable resource as governments plan how to transition from fossil fuels to renewables. However, there are both technical and economic challenges to overcome before floating offshore wind becomes a commercially viable option. Due to high deployment, capital, and development costs (due to the relative novelty of the technology), floating offshore wind currently has a much higher energy cost than other renewable options such as fixed bottom offshore or land-based wind turbines. The design of FOWTs also presents many engineering hurdles, such as maintaining platform stability without excessive system mass and cost, keeping the Levelized Cost of Energy (LCOE) competitive with other energy production methods, and ensuring the structure can withstand environmental loading from waves, wind, and turbine actions. SpiderFLOAT is a novel semi-submersible floating offshore wind substructure designed by the USFLOWT team under the ARPA-E ATLANTIS program. SpiderFLOAT is a flexible substructure consisting of a central column with three legs attached by moment-free connections and supported by tensioned stay-cables. Buoyancy cans are attached at the ends of the legs. This structure is designed to shed loading via structural compliance, reducing the structural requirements to sustain wind and wave loading in an offshore environment. This keeps system mass, and by extension material costs, lower than other FOWT substructure designs. This thesis investigates a few SpiderFLOAT substructure alterations to the design to mitigate loading and improve system stability while keeping system mass low. Two types of design alterations were considered: alterations to the structural geometry and the introduction of substructure actuation mechanisms. Structural alterations included system draft, buoyancy can size, stay cable attachment points, and the number of legs. Actuation mechanisms included the tension of the stay cables, the ballast level in the buoyancy cans, and adjustments in mooring-line length and thus tension.
    Rights
    Copyright of the original work is retained by the author.
    Collections
    2022 - Mines Theses & Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2023)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.