Browsing NTNU Open by Author "Horn, Jan-Tore H."
Now showing items 1-8 of 8
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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 ... -
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. ... -
Extreme response estimation of offshore wind turbines with an extended contour-line method
Horn, Jan-Tore H.; Winterstein, Steven R. (Journal article; Peer reviewed, 2018)The contour-line method is a simplified approach for finding the long-term extreme values by a small number of short-term analyses. It is assumed the response with a return period of T years occurs during a sea-state with ... -
Fatigue reliability assessment of offshore wind turbines with stochastic availability
Horn, Jan-Tore H.; Leira, Bernt Johan (Journal article; Peer reviewed, 2019)In this paper, the impact on lifetime estimation of an offshore wind turbine by introducing a stochastic model for the availability is investigated. Offshore bottom-fixed wind turbines typically have an average downtime ... -
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 ... -
Reducing uncertainty of Monte Carlo estimated fatigue damage in offshore wind turbines using FORM
Horn, Jan-Tore H.; Jensen, Jørgen Juncher (Chapter, 2016)Uncertainties related to fatigue damage estimation of non-linear systems are highly dependent on the tail behaviour and extreme values of the stress range distribution. By using a combination of the First Order Reliability ...