Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Offshore wind turbine"”.
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Foundations for an offshore wind turbine
… Renewable energy sources, such as solar and wind, are abundant but have very low power densities. The US is in the process of approving its first offshore wind farm, located in Nantucket Sound. Geotechnical factors will play a large role in the development of offshore wind projects due to the …
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Monopile Foundation Offshore Wind Turbine Simulation and Retrofitting
<p>Offshore wind turbines (OWT) provide a renewable source of energy with great proximity to many large cities. This has caused a major increase in OWT development and implementation, primarily in Europe, but spreading throughout the world. There are a multitude of different foundation options, …
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Offshore wind turbine nonlinear wave loads and their statistics
… influence of lateral flexible vibrations on offshore wind turbine foundations and the higher natural frequencies of the offshore wind turbine foundation relative to the dominant frequencies of the linear wave load model, the modeling of the dynamic behavior of the foundation under nonlinear …
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Extended tension leg platform design for offshore wind turbine systems
The rise of reliable wind energy application has become a primary alternative to conventional fossil fuel power plants in the United States and around the world. The feasibility of building large scale wind farms has become increasingly dependent on location. The ideal locations require placement …
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Structural fatigue assessment and optimisation of offshore wind turbine jacket foundations.
Offshore Wind Turbine (OWT) is an expensive type of renewable energy system, and there is a continuous effort to lower the capital and operational costs. Jacket foundations are increasingly used in offshore wind due to their relatively light weight and adaptability in deep waters. However, the …
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Fracture mechanics analysis of offshore wind turbine monopile structures for lifetime extension
As more early offshore wind farms reach the end of their design life, the wind industryneeds to prepare for end-of-life decision making for offshore wind turbine (OWT). One idea gaining traction is lifetime extension, that is, operating an OWT monopile beyond its original lifetime if it can be …
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Design of 10 MW low inductance PM generator for direct drive offshore wind turbine
… magnet synchronous generators (PMSG) in wind turbine applications are becoming increasingly popular due to their reliability compared to medium speed generators with a gearbox. A proposed generator-drive scheme with reduced active switching provides a way to reduce the power electronics …
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Modeling a Semi-Submersible Floating Offshore Wind Turbine With Tuned Inerter Dampers Within the Platform
… interest in renewable energy, resources like offshore wind are projected to grow in the near future. One key issue within offshore wind is how to stabilize the floating system when it experiences large wind and wave forces that impact its performance and shorten its operating life. Researchers …
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An Assessment of Surface Ice Sheet Loads and Their Effects on an Offshore Wind Turbine Structure
… examines the effects of surface ice sheets on an offshore wind turbine. First, the main ice load cases are presented, and methods used to calculate the loads from each of these cases are explained. These load cases consist of loads from moving ice sheets, loads from non-moving ice sheets, and …
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Industrial policy, skill formation, and job quality in the Danish, German and English offshore wind turbine industries
… policy, skill formation, and job quality in the offshore wind turbine manufacturing industry in Denmark, Germany and England. It engages with the comparative industrial relations, skill formation, and job quality literature and proposes an alternative analytical and theoretical framework to the …
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Industrial policy, skill formation, and job quality in the Danish, German and English offshore wind turbine industries
… policy, skill formation, and job quality in the offshore wind turbine manufacturing industry in Denmark, Germany and England. It engages with the comparative industrial relations, skill formation, and job quality literature and proposes an alternative analytical and theoretical framework to the …
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Real-time monitoring of scour and sediment deposition evolution at bridges and offshore wind turbine foundations based on soil electromagnetic properties
… and sediment) that will vary in a practical offshore installation environment. Results indicate that both prototype sensors can accurately measure scour and re-deposited sediment processes, potentially offering an accurate and low-cost alternative to existing scour monitoring instruments. …
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An Efficient Method to Assess Reliability under Dynamic Stochastic Loads
… in modeling the input. For instance, for an offshore wind turbine, there are considerable uncertainties in the power spectral density functions of the wave elevations or the wind speeds. Therefore, it is necessary to evaluate the reliability of a system for different power spectral density …
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Sizing Tool for Quadrotor Biplane Tailsitter UAS
… with aggressive cruise requirements, such as offshore wind turbine inspections, wherein transition from a quadcopter configuration to a QBT allows for a 5:1 trade of battery weight for wing weight. A 3D, unsteady panel method utilizing a nonlinear implementation of the Kutta-Joukowsky …
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A finite element analysis of the pullout capacity of suction caissons in clay
… becoming the foundation of choice for offshore structures in deep water. They are used extensively in Tension Leg Platforms and provide the most efficient foundations for many offshore wind turbine structures. One of their major advantages is the ability to withstand large uplift forces …
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Computation of nonlinear hydrodynamic loads on floating wind turbines using fluid-impulse theory
Wind energy is one of the more viable sources of renewable energy and offshore wind turbines represent a promising technology for the cost effective harvesting of this abundant source of energy. To capture wind energy offshore, horizontal-axis wind turbines can be installed on offshore platforms …
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Innovative hull design for servicing offshore wind turbines
Accessing turbines for maintenance is a key operational issue for an offshore wind farm. Currently there is a 1.5m significant wave height (Hs) limit for the standard “step over” method of transferring personnel to an offshore wind turbine, though this varies with, vessel type, wave period and …
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The infuence of hail on wind turbine blade leading edge erosion and damage
Wind turbine blade damage, particularly leading edge erosion, is a signifcant problem faced by the renewable energy industry. Wind turbines are subject to a wide range of environmental factors during a 20+ year lifespan, with hailstones often touted as a key contributor to the deterioration of …
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Frequency-domain modelling of floating wind turbines
The development of new types of offshore wind turbine on floating platforms requires the development of new approaches to modelling the combined platform-turbine system. In this thesis a linearised frequency-domain approach is developed which gives fast but approximate results: linearised models of …
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Advanced controls for floating wind turbines
Floating Offshore Wind Turbines (FOWT) is a technology that stands to spearhead the rapid growth of the offshore wind energy sector and allow the exploration of vast high quality wind resources over coastal and offshore areas with intermediate and large water depths. This generates the need for a …
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