• Active Load Mitigation to Counter the Fatigue Damage Contributions From Unavailability in Offshore Wind Turbines 

      Sørum, Stian Høegh; Smilden, Emil; Amdahl, Jørgen; Sørensen, Asgeir Johan (Chapter, 2018)
      The offshore wind industry continues to grow, but there is still a need for more economical designs. As unavailability conditions can be critical for the fatigue damage in support structures, design standards use conservative ...
    • Comparison of numerical response predictions for a bottom-fixed offshore wind turbine 

      Sørum, Stian Høegh; Horn, Jan-Tore H.; Amdahl, Jørgen (Journal article; Peer reviewed, 2017)
      Numerical simulations are widely used for response calculations on offshore wind turbines. Code-to-code comparisons are frequently used for verification of the codes, as full-scale measurements can be difficult to obtain. ...
    • Environmental lumping for efficient fatigue assessment of large-diameter monopile wind turbines 

      Katsikogiannis, George; Sørum, Stian Høegh; Bachynski, Erin Elizabeth; Amdahl, Jørgen (Peer reviewed; Journal article, 2021)
      Fatigue damage is one of the governing factors for the design of offshore wind turbines. However, the full fatigue assessment is a time-consuming task. During the design process, the site-specific environmental parameters ...
    • Fatigue design sensitivities of large monopile offshore wind turbines 

      Sørum, Stian Høegh; Katsikogiannis, Georgios; Bachynski-Polic, Erin Elizabeth; Amdahl, Jørgen; Page, Ana M.; Klinkvort, Rasmus Tofte (Peer reviewed; Journal article, 2022)
      The input for fatigue analyses of offshore wind turbines is typically chosen based on design values provided by design standards. While this provides a straightforward design methodology, the contribution of different input ...
    • Lateral response controlfor large-diameter monopile offshore wind turbines 

      Stava, Simon (Master thesis, 2020)
      Offshore vindturbiner er regulert av et kontrollsystem med det overordnede målet å optimalisere for energiproduksjon. Dette systemet kontrollerer generatorens dreiemoment og rotorblad-pitch med hensyn til den innkommende ...
    • Post‐installation adaptation of offshore wind turbine controls 

      Smilden, Emil; Sørum, Stian Høegh; Bachynski, Erin Elizabeth; Sørensen, Asgeir Johan; Amdahl, Jørgen (Journal article; Peer reviewed, 2020)
      The cost of offshore wind energy can be reduced by incorporating control strategies to reduce the support structures' load effects into the structural design process. While effective in reducing the cost of support structures, ...
    • SPAR Type Offshore Wind Turbine Subjected to Ship Impacts 

      Engevik, Anders (Master thesis, 2021)
      Et økende fokus på fornybar energi har ført til en rask utvikling av havvindindustrien de siste årene. For å takle det økende kraftbehovet økes størrelsen av vindturbinene og de flyttes lenger offshore. Det fører til at ...
    • Stochastic, Dynamic Analysis of Offshore Wind Turbines 

      Sørum, Stian Høegh (Master thesis, 2017)
      In the last 25 years, offshore wind turbines (OWTs) have moved from small machines of less that 500 kW in a few metres of water to large multi-megawatt machines in water depths exceeding 30 meters. On monopile foundations, ...
    • Tower Design for a 10MW Floating Offshore Wind Turbine with Reduced Stiffness 

      Fiskvik, Stian (Master thesis, 2020)
      Abstract will be available on 2023-07-01
    • Uncertainties in the Design of Monopile Offshore Wind Turbines 

      Sørum, Stian Høegh (Doctoral theses at NTNU;2023:276, Doctoral thesis, 2023)
      English summary If the ambitious targets for growth in installed capacity of offshore wind turbines over the next decades are to be met, more cost-efficient wind farms need to be developed. One way of achieving this can ...
    • Validation of Numerical Models of the Offshore Wind Turbine From the Alpha Ventus Wind Farm Against Full-Scale Measurements Within OC5 Phase III 

      Popko, Wojciech; Robertson, Amy; Jonkman, Jason; Wendt, Fabian; Thomas, Philipp; Müller, Kolja; Kretschmer, Matthias L.; Hagen, Torbjørn Ruud; Galinos, Christos; Dreff, Jean-Baptiste Le; Gilbert, Philippe; Auriac, Bertrand; Oh, Sho; Qvist, Jacob; Sørum, Stian Høegh; Suja, Loup; Shin, Hyunkyoung; Molins, Climent; Trubat, Pau; Bonnet, Paul; Bergua, Roger; Wang, Kai; Fu, Pengcheng; Cai, Jifeng; Cai, Zhisong; Alexandre, Armando; Harries, Robert (Peer reviewed; Journal article, 2020)
      The main objective of the Offshore Code Comparison Collaboration Continuation, with Correlation (OC5) project is validation of aero-hydro-servo-elastic simulation tools for offshore wind turbines (OWTs) through comparison ...
    • Validation of Numerical Models of the Offshore Wind Turbine From the Alpha Ventus Wind Farm Against Full-Scale Measurements Within OC5 Phase III 

      Popko, Wojciech; Robertson, Amy; Jonkman, Jason; Wendt, Fabian; Thomas, Philipp; Müller, Kolja; Kretschmer, Matthias L.; Hagen, Torbjørn Ruud; Galinos, Christos; Dreff, Jean-Baptiste Le; Gilbert, Philippe; Auriac, Bertrand; Oh, Sho; Qvist, Jacob; Sørum, Stian Høegh; Suja, Loup; Shin, Hyunkyoung; Molins, Climent; Trubat, Pau; Bonnet, Paul; Bergua, Roger; Wang, Kai; Fu, Pengcheng; Cai, Jifeng; Cai, Zhisong; Alexandre, Armando; Harries, Robert (Chapter, 2019)
      The main objective of the Offshore Code Comparison Collaboration Continuation, with Correlation (OC5) project is validation of aero-hydro-servo-elastic simulation tools for offshore wind turbines (OWTs) through comparison ...
    • Verification of Numerical Offshore Wind Turbine Models Based on Full Scale Alpha Ventus Data within OC5 Phase III 

      Popko, Wojciech; Huhn, Matthias L.; Robertson, Amy N.; Jonkman, Jason M.; Wendt, Fabian; Müller, Kolja; Kretschmer, Matthias L.; Vorpahl, Fabian; Hagen, Torbjørn Ruud; Galinos, Christos; Dreff, Jean-Baptiste Le; Gilbert, Philippe; Auriac, Bertrand; Villora, Francisco Navarro; Schünemann, Paul; Bayati, Ilmas; Oh, Sho; Totsuka, Yoshitaka; Qvist, Jacob; Bachynski, Erin Elizabeth; Sørum, Stian Høegh; Thomassen, Paul Edgar; Shin, Hyun Kyoung; Vittori, Felipe; Galvan, Josean; Molins, Climent; Bonnet, Paul; Zee, Tjeerd van der; Bergua, Roger; Wang, Kai; Fu, Pengcheng; Cai, Jifeng (Chapter, 2018)
      The main objective of the Offshore Code Comparison Collaboration Continuation, with Correlation (OC5) project, is validation of aero-hydro-servo-elastic simulation tools for offshore wind turbines (OWTs) through comparison ...
    • Wind and soil model influences on the uncertainty in fatigue of monopile supported wind turbines 

      Sørum, Stian Høegh; Bachynski-Polic, Erin Elizabeth; Amdahl, Jørgen (Peer reviewed; Journal article, 2022)
      Several alternative engineering models are available for the use in analysis of offshore wind turbines. However, it is not always clear which of the models will yield the most accurate or sufficiently conservative results. ...
    • Wind-wave directional effects on fatigue of bottom-fixed offshore wind turbine 

      Sørum, Stian Høegh; Krokstad, Jørgen R; Amdahl, Jørgen (Journal article; Peer reviewed, 2019)
      The current trend for offshore wind energy is that larger turbines are placed on monopile foundations at increasing water depth. This requires larger foundations, increasing the importance of hydrodynamic loading. It is ...