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Contributed
20 records found
QUAD Lift Workability Analysis
Evaluating the Dynamic Interaction Between Two Dual crane Vessels using a Frequency Domain Modelling Technique
A QUAD lift is a new lifting method in which dual crane vessels combine their vessel capability to increase their offshore lift performance. The use of the Jumbo J-Class vessels in a QUAD lift creates the opportunity to increase the offshore lift capacity and to install structure
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Workability optimisation of the Stella Synergy
During monopile installation with a motion-compensated gripper and using its DP-system
Using a floating vessel operating on its DP-system and using a motion-compensated pile gripper to install monopiles could be the installation method of the future. Therefore, this thesis focuses on this method. The main objective of this thesis project is to build a model that ac
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Mooring analysis for a TLP supporting a 15MW wind turbine
Identifying critical design parameters that influence the design life of a mooring system regarding higher-order loads for a TLP supporting a 15MW wind turbine
With the pressing matter of climate change, the importance of renewable energy sources is increasing day by day. A large portion of this renewable energy is to be generated with the use of wind turbines, which are commonly located onshore. In recent decades, great effort has been
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Mooring system design, related to Pioneering Spirit
Improvement of a mooring system to secure a barge alongside Pioneering Spirit in offshore conditions, including an evaluation of the dynamic loads
Continuous development in the wind turbine industry leads to increasing size of wind turbines. Allseas investigates the possibility to enter the offshore wind turbine installation industry with Pioneering Spirit.
For Allseas’ preliminary wind turbine installation design, wind tur
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A hydrodynamic study on floating export cable systems
Using finite element method modelling to study the hydrodynamic behaviour and optimise the design of floating export cable systems
During ‘float-out’ installation of export cables, the cable is pulled to shore while floating, supported by inflatable floaters. Understanding the hydrodynamic behaviour of these cable-floater-systems (CFS’s) is important, to be able to relate the hydraulic environment to the cab
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Preference and Performance Based Design & Decision Systems in Offshore & Dredging Engineering
A multi-objective design/decision optimisation approach based on sound mathematical modelling of both preference and physical design performance functions
Why do engineers often design what people don't want? And why do people often want solutions that are not feasible? This is because the current design and decision support optimisation methodologies are one-sided and ignore or fail to capture the dynamic interaction between peopl
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Design of a suction pile installation template
A case study on the implementation and design of a suction pile installation template as an installation aid for suction pile foundation installations
For the installation of suction pile jackets, a new installation method initiated by SPT Offshore could extend the allowable size for suction pile jackets used as foundations for offshore wind turbines. This method involves installing the suction piles separately from the jacket
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Floating Solar
A Hydroelastic Method
With the climate goals of the Paris Agreement and the European Green Deal, countries need to reduce their carbon footprint and increase their renewable energy production. For countries with high population density, land-based photovoltaics (solar) takes up valuable space. Therefo
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Advantages and Challenges of Perforated Monopiles in Deep Water Sites
Comprehensive study of stress concentrations and fatigue loads of monopile foundations in deep water sites
The potential for developing more efficient offshore wind support structures becomes increasingly critical as the offshore wind sector is faced with challenges such as rising commodity prices and shrinking profit margins. These challenges not only impact the industry’s capacity t
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Systematic approach to find a suitable floating PV-structure on a given location
Comparing the environmental loads on different types of floating solar structures
The Netherlands has agreed, by signing the Paris Agreement, to be climate-neural by 2050. To reach this goal, many large-scale renewable energy projects need to be developed in the coming years using for example wind, geothermal or solar energy. The problem with these projects is
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Two raft wave energy converters
A combined optimisation of annual energy conversion and stability
Global warming has caused an increasing demand for renewable energy. Currently, 50% of the renewable energy is provided by wind and solar combined. However, these renewable energy sources are highly volatile. Wave energy converters can provide a stable renewable energy source. Pr
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Hydroelastic wave deformation of Very Flexible Floating Structures
A performance study of a monolithic finite element model
At the moment, the world is at the verge of an energy transition. One of the most promising green resources is solar energy, which is a rapidly growing market. However, to fully use its potential of economy of scale, the application of offshore floating solar should be explored.
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Installation of perforated monopiles
And the associated fatigue damage
The European offshore wind industry has experienced significant growth in the past decade, mainly focusing on shallow areas in the North Sea to reduce the Levelised Cost of Electricity (LCoE) and compete with fossil fuels. However, as shallow areas become scarcer and the industry
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Using CFD to design riprap bed protections downstream of underflow weirs
Weir design of the future
Weirs are constructed inside rivers to manage the water level. On the one hand they need to be designed sufficiently strong to prevent failure or destruction, while on the other hand they need to be economically feasible. If a structure is designed too strong, unnecessary costs a
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Fatigue Safety Factors for Dynamic Power Cables
A reliability based approach
In contrast to traditional power cables for bottom-founded offshore wind turbines, power cables for floating wind turbines penetrate the water column and are exposed to cyclic loading. Due to the dynamic nature of the cable loading, the cables are prone to fatigue failure. Since
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Homogenization Techniques in Digital Rock Physics
Revisiting the Hill-Mandel principle and determination of the evolution law of the convergence cone
The first part of the thesis explores the process of homogenization, particularly for the permeability properties of rock samples. The Hill-Mandel postulate of energy consistency throughout the transitioning of scales is revisited since traditional homogenization methods rely on
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Floating Spar Optimization
A constraint set investigation for the use of simulated annealing for substructure optimization
With the increase in need for offshore wind exploitation a research is set up with aims to develop a preliminary design tool. The introduction begins with background information on what role floating wind will play in the offshore wind industry and why this is a relevant topic. A
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Wind Farm Design
Strategy-based IMAP optimization for parametrically scalable offshore wind farm design
Offshore wind farms, critical for sustainable energy production, face the challenge of optimization among many parameters influencing the objectives in conflicting ways. In response, this research introduces the novel Integrative Maximized Aggregated Preference Wind Farm Optimiza
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Wind Farm Design
Strategy-based IMAP optimization for parametrically scalable offshore wind farm design
Offshore wind farms, critical for sustainable energy production, face the challenge of optimization among many parameters influencing the objectives in conflicting ways. In response, this research introduces the novel Integrative Maximized Aggregated Preference Wind Farm Optimiza
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