Browsing Institutt for marin teknikk by Subject "Wind Energy, Offshore Engineering"
Now showing items 1-20 of 31
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A Winkler Model for the Seismic Analysis of Monopile Foundations - An Exploratory Study on the Modelling of Soil-Structure Interaction during Earthquakes
(Master thesis, 2018)The growing interest in the development of offshore wind farms in seismic active areas demands a better insight into the requirements earthquakes impose on the design of wind turbine foundations. The complexity of the ... -
Analysis of the Parametric Instability of the STC Combined Wind and Wave Energy Concept
(Master thesis, 2017)The purpose of this study is to numerically predict such unstable motions for regular and irregular wave conditions and to compare the results with the experimental observations. First, a literature study on Mathieu ... -
Analysis of the Reduced Wake Effect for Available Wind Power Calculation during Curtailment - Including Validation Experiments
(Master thesis, 2017)With increasing wind power capacity, the impact of wind power on power system operation increases. For a mature integration of large amounts of wind power, controlling wind farm output by temporary curtailment becomes ... -
Comparison of vertically sided model structures with circular and rectangular cross section subjected to ice-induced vibrations in the frequency lock-in regime
(Master thesis, 2017)Very recently, offshore wind energy has begun expanding into subarctic regions with seasonally ice-infested waters like the Baltic Sea. For offshore wind turbines with conventional support structures including monopiles ... -
Computation of Nonlinear Wave Loads on Floating Structures
(Master thesis, 2017)Floating wind turbines (FWTs) are proposed as a method to harness the significant wind energy resource in deep water. International research efforts have led to the development of coupled numerical global analysis tools ... -
Design and analysis of a large wind floater - A reinforced concrete pontoon-type semi-submersible supporting the DTU 10MW reference turbine
(Master thesis, 2014)In the project work, the candidate has made a preliminary design of a concrete semi-submersible floater for supporting the DTU 10MW wind turbine. In particular, the focus was the design of pontoons and columns of this ... -
Design and Analysis of Semi-submersible Floating Wind Turbines with focus on Structural Response Reduction
(Master thesis, 2015)Floating structures as spar, semi-submersibles and TLP have been proposed for offshore wind turbines for deep waters (>60m) according to the report of Arapogianni, Moccia, Williams, & Phillips (2011), where bottom fixed ... -
Design and Dynamic Analysis of a Steel Pontoon-type Semi-submersible Floater Supporting the DTU 10MW Reference Turbine
(Master thesis, 2014)In recent years, oshore wind energy has experienced a huge development. Floating wind turbines may become competitive for water depth larger than 50m. However, high cost is still the main challenge for the oshore wind ... -
Design of a Counter Weight Suspension System for the TetraSpar Floating Offshore Wind Turbine
(Master thesis, 2018)New floating wind turbine designs are needed to reduce production costs and to increase mass production feasibility. The TetraSpar floating wind turbine achieves these goals by being constructed using components highly ... -
Design of Monopile Foundations to Support the DTU 10 MW Offshore Wind Turbine
(Master thesis, 2016)Further advancements in the offshore wind industry, which come with the use of larger wind turbines at deeper water, require larger support structures. For shallow and intermediate water depths, monopile foundations still ... -
Dynamic Analysis of a Floating Vertical Axis Wind Turbine using the Actuator Cylinder Flow Theory - Comparative study on a land-based versus spar vertical axis wind turbine concept and a code-to-code comparison
(Master thesis, 2016)An ever-increasing demand for electricity pushes the wind energy industry to deep waters that favor floating concepts. Vertical axis wind turbines (VAWTs) failed for onshore applications in the 1980s, but its advantages ... -
Dynamic Analysis of a Monopile Offshore Wind Support Structure Subjected to Earthquakes - A Comparative Study Between the Responses of an Elastic and an Inelastic Soil-Structure Interaction Model Through Incremental Dynamic Analysis
(Master thesis, 2018)It was shown that the response of the structure is highly sensitive to the amplitude of the earthquake, following a nonlinear increase in response with increasing PGD. Even at the recorded moderate earthquake level, nonlinear ... -
A Dynamic Approach to Evaluating the Effect of Slamming on a Jacket Foundation Template Lowered Through the Wave Zone
(Master thesis, 2015)The joint venture between Boskalis and VolkerWessels is responsible for installing 70 jacket foundations for the Wikinger offshore wind farm. The critical phase in this installation procedure is lowering a jacket foundation ... -
Dynamic Response Analysis of a Spar Floating Wind Turbine in Level Ice with Varying Thickness
(Master thesis, 2016)This master thesis is the final step before graduation from the Offshore Engineering track of the European Wind Energy Master. Both the Diploma award universities contributed significantly in the completion if this work ... -
Efficient Response Simulation Strategies for Jacket-based Offshore Wind Turbines - An integrated approach combining model reduction and nonlinear irregular wave theory
(Master thesis, 2014)The offshore wind industry has been growing exponentially over the last two decades, thereby establishing itself as one of the most promising alternative energy sources. Technological developments are required to reach ... -
Efficient rotor modelling for real-time hybrid testing
(Master thesis, 2017)Small-scale model tests in wave basins are important tools for validating numerical tools, evaluating system performance, and studying physical phenomena related to floating wind turbines. Hydrodynamic tests generally ... -
Evaluation of the Fatigue Resistance of Offshore Jacket Joints by Numerical Approaches
(Master thesis, 2017)Jacket support structures are a preferred solution for offshore wind turbines in deeper waters. Extensive knowledge exists in relation to its construction technique as well as its crucial components, but due to considerable ... -
Experimental set-up of the Double Slip Joint - Investigating the settling behaviour
(Master thesis, 2015)The Double Slip Joint (DSJ) is a new design to connect the transition piece to the foundation pile of an oshore wind turbine. It potentially oers high dynamic strength and reliability at a lower cost thereby assisting the ... -
Gradient-based Optimization of Jacket Support Structure for Offshore Wind Turbines with the Local Approach
(Master thesis, 2017)The objective of this thesis is the development of a gradient based optimization framework for the local optimization of structural members of an offshore wind turbine with jacket support structure and the implementation ... -
Hydrodynamic loads on an inclined monopile in the splash zone
(Master thesis, 2018)The thesis is about a relatively new installation method for monopile foundations for offshore wind turbines. For this method, the monopiles are upended from horizontal to vertical position using an upending tool and a ...