Browsing NTNU Open by Author "Page, Ana M."
Now showing items 1-13 of 13
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A macro-element for integrated time domain analyses representing bucket foundations for offshore wind turbines
Skau, Kristoffer Skjolden; Grimstad, Gustav; Page, Ana M.; Eiksund, Gudmund Reidar; Jostad, Hans Petter (Journal article; Peer reviewed, 2018)The paper presents a macro-element model for bucket foundations to be used in integrated time domain analyses of offshore wind turbines. The macro-element has been formulated in the multi-surface plasticity framework, and ... -
A macro-element model for multidirectional cyclic lateral loading of monopiles in clay
Page, Ana M.; Grimstad, Gustav; Eiksund, Gudmund Reidar; Jostad, Hans Petter (Journal article; Peer reviewed, 2018)This paper investigates numerically the impact of multidirectional cyclic loads on the response of a monopile in clay supporting an offshore wind turbine (OWT). The results indicate that multidirectional loading modifies ... -
A macro-element pile foundation model for integrated analyses of monopilebased offshore wind turbines
Page, Ana M.; Grimstad, Gustav; Eiksund, Gudmund Reidar; Jostad, Hans Petter (Journal article; Peer reviewed, 2018)The design of OWTs relies on integrated load analyses tools that simulate the response of the entire OWT (including the rotor-nacelle assembly, support structure and foundation) under combined aerodynamic and hydrodynamic ... -
A New Foundation Model for Integrated Analyses of Monopile-based Offshore Wind Turbines
Page, Ana M.; Skau, Kristoffer Skjolden; Jostad, Hans Petter; Eiksund, Gudmund Reidar (Journal article; Peer reviewed, 2017)Offshore wind turbines are highly dynamic and tightly coupled systems subjected to variable cyclic loads. Designing and optimizing the support structure is a complex task, where several load scenarios have to be analysed ... -
Alternative Numerical Pile Foundation Models for Integrated Analyses of Monopile-based Offshore Wind Turbines
Page, Ana M.; Schafhirt, Sebastian; Eiksund, Gudmund Reidar; Skau, Kristoffer Skjolden; Jostad, Hans Petter; Sturm, Hendrik (Chapter, 2016)Lowering the cost for offshore wind energy remains a major challenge. Increasing the accuracy of analysis tools used in the design and optimization process can strengthen the reliability and reduce conservatism, thereby ... -
Dynamic Response of A Large-Diameter Monopile Considering 35-Hour Storm Conditions
Bachynski, Erin Elizabeth; Page, Ana M.; Katsikogiannis, George (Journal article; Peer reviewed, 2019)As a part of the assessment of foundation resistance for monopiles, several offshore wind standards prescribe symmetric 35-hour (or 42-hour) storm sequences in terms of wind speed and significant wave height. The temporal ... -
Effect of foundation modelling on the fatigue lifetime of a monopile-based offshore wind turbine
Aasen, Steffen; Page, Ana M.; Skau, Kristoffer Skjolden; Nygaard, Tor Anders (Journal article; Peer reviewed, 2017)everal studies have emphasized the importance of modelling foundation response with representative damping and stiffness characteristics in integrated analyses of offshore wind turbines (OWTs). For the monopile foundation, ... -
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 ... -
Fatigue sensitivity to foundation modelling in different operational states for the DTU 10MW monopile-based offshore wind turbine
Katsikogiannis, George; Bachynski, Erin Elizabeth; Page, Ana M. (Journal article; Peer reviewed, 2019)The importance of foundation modelling for the support-structure fatigue damage estimation of a 10 MW monopile based offshore wind turbine is investigated in different operational states and wind-wave misalignment conditions. ... -
Impact of foundation modelling in offshore wind turbines: Comparison between simulations and field data
Page, Ana M.; Næss, Veronika; De Vaal, Jacobus Bernardus; Eiksund, Gudmund Reidar; Nygaard, Tor Anders (Journal article; Peer reviewed, 2019)The design of Offshore Wind Turbines (OWTs) relies on integrated simulation tools capable of predicting the system dynamic characteristics and the coupled loads and responses. Despite allefforts to develop accurate integrated ... -
Influence of Soil Parameters on the Fatigue Lifetime of Offshore Wind Turbines with Monopile Support Structure
Schafhirt, Sebastian; Page, Ana M.; Eiksund, Gudmund Reidar; Muskulus, Michael (Journal article; Peer reviewed, 2016)Designing support structures for offshore wind turbines is a complex task as these are highly dynamic systems subjected to long-term cyclic loads with variable amplitude. Long-term cyclic loading may cause stiffening or ... -
Optimization of Piles Supporting Monopile-Based Offshore Wind Turbines by Improved Foundation Models
Næss, Veronika (Master thesis, 2018)With the focus on renewable energy sources over the last decades, offshore wind has become a popular source of energy harvesting. Among the different foundation concepts, the monopile is, by far, the most favourable for ... -
REDWIN – REDucing cost in offshore WINd by integrated structural and geotechnical design
Skau, Kristoffer Skjolden; Page, Ana M.; Kaynia, Amir M.; Løvholt, Finn; Norén-Cosgriff, Karin; Sturm, Hendrik; Andersen, H.S.; Nygaard, Tor Anders; Jostad, Hans Petter; Eiksund, Gudmund Reidar; Havmøller, O.; Strøm, P.; Eichler, D. (Journal article; Peer reviewed, 2018)The cost of offshore wind energy production has to be reduced continuously to improve its competitiveness compared to other energy sources. To contribute to this goal, a 4- year research project REDWIN – REDucing cost of ...