Blar i NTNU Open på forfatter "Krokstad, Jørgen R"
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A new combination of conditional environmental distributions
Horn, Jan-Tore H.; Bitner-Gregersen, Elzbieta M.; Krokstad, Jørgen R; Leira, Bernt Johan; Amdahl, Jørgen (Journal article, 2018)In this paper, a joint distribution of all relevant environmental parameters used in design of offshore structures including directional components is presented, along with a novel procedure for dependency modelling between ... -
Critical assessment of hydrodynamic load models for a monopile structure in finite water depth
Suja, Loup; Bachynski, Erin Elizabeth; Pierella, Fabio; Borg, Michael; Krokstad, Jørgen R; Bredmose, Henrik (Peer reviewed; Journal article, 2020)The response from steep and breaking waves for a monopile structure is investigated by analysis of experimental results and by application of numerical models for six irregular sea states. The experimental monopile was ... -
Critical assessment of non-linear hydrodynamic load models for a fully flexible monopile offshore wind turbine
Suja, Loup; Krokstad, Jørgen R; Bachynski, Erin Elizabeth (Journal article; Peer reviewed, 2018)This paper presents a comparison between experimental data of a model-scale 4 MW monopile offshore wind turbine subjected to extreme irregular sea states in finite water and the numerical models suggested in offshore wind ... -
Experimental results of a multimode monopile offshore wind turbine support structure subjected to steep and breaking irregular waves
Suja-Thauvin, Loup; Krokstad, Jørgen R; Bachynski, Erin Elizabeth; de Ridder, Erik-Jan (Journal article; Peer reviewed, 2017)We present experimental data from MARIN on a bottom-fixed offshore wind turbine mounted on a monopile in intermediate water depth subjected to severe irregular wave conditions. Two models are analysed: the first model is ... -
Impact of model uncertainties on the fatigue reliability of offshore wind turbines
Horn, Jan-Tore H.; Krokstad, Jørgen R; Leira, Bernt Johan (Journal article; Peer reviewed, 2019)The impact of environmental load uncertainties on the spatial fatigue reliability of offshore wind turbine foundations is discussed and exemplified. Design procedures are utilizing overall or partial safety factors to ... -
Joint Probability Distribution of Environmental Conditions for Design of Offshore Wind Turbines
Horn, Jan-Tore H.; Krokstad, Jørgen R; Amdahl, Jørgen (Chapter; Peer reviewed, 2017)The design process for offshore wind turbines includes a fatigue life evaluation of the structure with the relevant environmental conditions at the specified wind farm location. Such analyses require long-term distributions ... -
Long-Term Fatigue Damage Sensitivity to Wave Directionality in Extra Large Monopile Foundations
Horn, Jan-Tore H.; Krokstad, Jørgen R; Amdahl, Jørgen (Journal article, 2017)The fatigue damage sensitivity to wave directionality on large-diameter monopile foundations for use in the offshore wind turbine industry is investigated. A frequency domain approach with the Dirlik method is used for a ... -
The Dimensioning Sea Loads (DIMSELO) project
Pierella, Fabio; Bredmose, Henrik; De Vaal, Jacobus Bernardus; Eliassen, Lene; Krokstad, Jørgen R; Nygaard, Tor Anders; Oggiano, Luca; Stenbro, Roy (Journal article; Peer reviewed, 2018)DIMSELO is a Competence Building for Industry project (KPN), granted by the Norwegian Research Council under the ENERGIX program, which ran from 2013 to 2017. The project's objective was to quantify the consequences of ... -
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 ...