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Floating wind turbine optimization via surrogate modelling

KALIMERIS, THEODORE (author)

In recent years, the interest in deep-water wind energy projects has drastically increased, driven by the considerable wind resource in deep-water locations. In such locations, floating wind turbines are more economically attractive than bottom-fixed wind turbines. Nevertheless, the floating wind industry faces numerous challenges. One major...

master thesis 2023

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Offshore Methane Pyrolysis: A techno-economic analysis to assess the feasibility of offshore methane pyrolysis for the production of hydrogen

Stroo, Aike (author)

Methane pyrolysis is a technology that has the potential to greatly reduce the CO2 emissions of hydrogen production on a large scale. The process generates solid carbon instead of gaseous, thereby inhibiting emissions and has a relatively low process energy demand.<br/><br/>A three-step approach was taken to investigate the feasibility of...

master thesis 2023

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Influence of static–cyclic load misalignment on the drained tilting response of offshore monopiles in sand

Li, Z. (author), Liu, Haoyuan (author), Hicks, M.A. (author), Pisano, F. (author)

Offshore monopile foundations are exposed to misaligned wind and wave loadings, which are respectively dominated by (nearly) static and cyclic load components. While the response of these systems to unidirectional cyclic loading has been extensively investigated, only a few studies have been devoted to the realistic case of misaligned static...

journal article 2023

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Preloading of four-legged jack-ups in clay: Geotechnical time effects and fulfilment of preloading criteria

Sonnema, Wouter (author), Brinkman, Sanne (author), Brinkgreve, R.B.J. (author), Pisano, F. (author)

Presented here is a numerical study on the preloading of four-legged jack-ups, such as those commonly employed in the construction of offshore wind farms. The need for reducing jack-up installation time is particularly felt within the offshore industry, especially when multiple preloading cycles are necessary in clayey soils to fulfil given...

journal article 2023

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Rigid body dynamic response of a floating offshore wind turbine to waves: Identification of the instantaneous centre of rotation through analytical and numerical analyses

Patryniak, Katarzyna (author), Collu, Maurizio (author), Coraddu, A. (author)

Floating Offshore Wind Turbines (FOWT) can harness the abundant offshore wind resource at reduced installation requirements. However, a further decrease in the development risks through higher confidence in the design and analysis methods is needed. The dynamic behaviour of FOWT systems is complex due to the strong interactions between the...

journal article 2023

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Modelling mechanical behavior of offshore floating solar concepts

Janssen, Tjeerd (author)

The world is currently in a global energy transition. To reach the global energy goals requires massive deployment of clean and efficient energy technologies. The use of solar photovoltaic (PV) therefore has to be scaled up. Offshore deployment of floating PV would be a suitable solution. There are currently different concepts in development for...

master thesis 2022

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The relationship between soil index properties and the cyclic shear strength from undrained cyclic tests

van der Klooster, Marjanne (author)

Offshore wind power structures are subjected to cyclic loading. Several loads like wind and wave loading are acting on the structure and therefore its foundation. It is important to involve the impact of this cyclic loading into the design of the structure. A cyclic load influences the strength and deformation characteristics of the soil. Due to...

master thesis 2021

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On the effects of non-linearities in DP systems

Quast, Arnout (author)

In offshore operations a trend is forming where vessels are more often required to do multiple short operations within a small-time frame. Traditional mooring systems require execution time far beyond the operation time. Dynamic positioning systems offer great advantages for short time span operations such as crew transfer or lift operations. ...

master thesis 2021

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Lateral response of rigid monopiles subjected to cyclic loading: Centrifuge modelling

Li, Q. (author), Askarinejad, A. (author), Gavin, Kenneth (author)

In this study, a total number of 20 centrifuge tests were carried out to investigate monopile behaviour under lateral cyclic loading. The instrumented model pile simulates an offshore wind turbine foundation with an embedment ratio of 5 installed in sand layers with two relative densities of 80% and 50%. The influence of the directional...

journal article 2021

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New insights into the failure mechanisms of horizontal plate anchors in clay during pull-out

Jalilvand, Soroosh (author), Gavin, Kenneth (author), Sivakumar, Vinayagamoothy (author), Gilbert, Robert B. (author), Bradshaw, Aaron (author)

Offshore wind developments are moving towards deep-water regions where energy is abundant, visual impact is minimised and the larger turbine sizes can make the energy production more cost-effective. One of the key challenges facing the industry is the development of reliable substructures. While fixed foundation systems are widely used for...

journal article 2021

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From cyclic sand ratcheting to tilt accumulation of offshore monopiles: 3D FE modelling using SANISAND-MS

Liu, H. (author), Kementzetzidis, E. (author), Abell, J. A. (author), Pisano, F. (author)

Serviceability criteria for offshore monopiles include the estimation of long-term, permanent tilt under repeated operational loads. In the lack of well-established analysis methods, experimental and numerical research has been carried out in the last decade to support the fundamental understanding of monopile-soil interaction mechanisms, and...

journal article 2021

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Upscaling the TetraSpar: Large-scale floating offshore wind turbines design methodology and modelling

Verbeeten, Gijs (author)

During the past decade, the offshore wind energy industry evolved to bigger turbines, going into deeper waters and farther offshore. As bottom-fixed wind turbines are limited to shallow water depths, floating wind structures are the next frontier to unlock the vast potential of wind energy. Despite many techno-economic challenges, several full...

master thesis 2020

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Ground response during offshore pile driving in a sandy slope

Lamens, Pascale (author), Askarinejad, A. (author), Sluijsmans, Robbin W. (author), Feddema, Antoine (author)

This paper presents an analysis of field measurements obtained during pile installation tests in a submerged sandy slope. The field test was performed in 2016 as part of the construction of a new sea lock in the Netherlands. Ground vibrations and excess pore pressures were to be limited in order to prevent damage to neighbouring locks and...

journal article 2020

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Field experiments at three sites to investigate the effects of age on steel piles driven in sand

Carroll, R. (author), Carotenuto, P. (author), Dano, C. (author), Salama, I. (author), Silva, M. (author), Rimoy, S. (author), Gavin, Kenneth (author), Jardine, R. (author)

This paper investigates the influences that steel type, in situ soil properties, water table depth, pile diameter, roughness and driving procedures have on the ageing behaviour of piles driven in sand. Tension tests have been performed on 51 open-ended steel micro-piles, with 48 to 60 mm outside diameter, driven at well-established research...

journal article 2020

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Monotonic laterally loaded pile testing in a stiff glacial clay till at Cowden

Byrne, Byron W. (author), McAdam, Ross A. (author), Burd, Harvey J. (author), Beuckelaers, William J.A.P. (author), Gavin, Kenneth (author), Houlsby, Guy T. (author), Igoe, David J.P. (author), Jardine, Richard J. (author), Martin, Christopher M. (author)

This paper describes the results obtained from a field testing campaign on laterally loaded monopiles conducted at Cowden, UK, where the soil consists principally of a heavily overconsolidated glacial till. These tests formed part of the PISA project on the development of improved design methods for monopile foundations for offshore wind...

journal article 2020

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PISA design model for monopiles for offshore wind turbines: Application to a stiff glacial clay till

Byrne, Byron W. (author), Houlsby, Guy T. (author), Burd, Harvey J. (author), Gavin, Kenneth (author), Igoe, David J.P. (author), Jardine, Richard J. (author), Martin, Christopher M. (author), McAdam, Ross A. (author), Potts, David M. (author)

Offshore wind turbines in shallow coastal waters are typically supported on monopile foundations. Although three-dimensional (3D) finite-element methods are available for the design of monopiles in this context, much of the routine design work is currently conducted using simplified one-dimensional (1D) models based on the p-y method. The p-y...

journal article 2020

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Monotonic laterally loaded pile testing in a dense marine sand at Dunkirk

McAdam, Ross A. (author), Byrne, Byron W. (author), Houlsby, Guy T. (author), Beuckelaers, William J.A.P. (author), Burd, Harvey J. (author), Gavin, Kenneth (author), Igoe, David J.P. (author), Jardine, Richard J. (author), Martin, Christopher M. (author)

The results obtained from a field testing campaign on laterally loaded monopiles, conducted at a dense sand site in Dunkirk, northern France are described. These tests formed part of the PISA project on the development of improved design methods for monopile foundations for offshore wind turbines. Results obtained from monotonic loading tests...

journal article 2020

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Finite-element modelling of laterally loaded piles in a stiff glacial clay till at Cowden

Zdravkovic, Lidija (author), Taborda, David M.G. (author), Potts, David M. (author), Abadias, David (author), Burd, Harvey J. (author), Byrne, Byron W. (author), Gavin, Kenneth (author), Houlsby, Guy T. (author), Jardine, Richard J. (author)

The PISA project was a combined field testing/numerical modelling study with the aim of developing improved design procedures for large-diameter piles subjected to lateral loading. This paper describes the development of a three-dimensional finite-element model for the medium-scale pile tests that were conducted in Cowden till as part of the...

journal article 2020

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PISA design model for monopiles for offshore wind turbines: Application to a marine sand

Burd, Harvey J. (author), Taborda, David M.G. (author), Zdravkovic, Lidija (author), Abadie, Christelle N. (author), Byrne, Byron W. (author), Houlsby, Guy T. (author), Gavin, Kenneth (author), Igoe, David J.P. (author), Jardine, Richard J. (author)

This paper describes a one-dimensional (1D) computational model for the analysis and design of laterally loaded monopile foundations for offshore wind turbine applications. The model represents the monopile as an embedded beam and specially formulated functions, referred to as soil reaction curves, are employed to represent the various...

journal article 2020

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New data analysis methods for instrumented medium-scale monopile field tests

Burd, Harvey J. (author), Beuckelaers, William J.A.P. (author), Byrne, Byron W. (author), Gavin, Kenneth (author), Houlsby, Guy T. (author), Igoe, David J.P. (author), Jardine, Richard J. (author), Martin, Christopher M. (author), McAdam, Ross A. (author)

The PISA Joint Industry Research Project was concerned with the development of improved design methods for monopile foundations in offshore wind applications. PISA involved large-scale pile tests in overconsolidated glacial till at Cowden, north-east England, and in dense, normally consolidated marine sand at Dunkirk, northern France. This...

journal article 2020