Fully Vs Sequentially Coupled Loads Analysis Of Offshore Wind Turbines
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Fully Vs Sequentially Coupled Loads Analysis Of Offshore Wind Turbines
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Author :
language : en
Publisher:
Release Date : 2017
Fully Vs Sequentially Coupled Loads Analysis Of Offshore Wind Turbines written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The design and analysis methods for offshore wind turbines must consider the aerodynamic and hydrodynamic loads and response of the entire system (turbine, tower, substructure, and foundation) coupled to the turbine control system dynamics. Whereas a fully coupled (turbine and support structure) modeling approach is more rigorous, intellectual property concerns can preclude this approach. In fact, turbine control system algorithms and turbine properties are strictly guarded and often not shared. In many cases, a partially coupled analysis using separate tools and an exchange of reduced sets of data via sequential coupling may be necessary. In the sequentially coupled approach, the turbine and substructure designers will independently determine and exchange an abridged model of their respective subsystems to be used in their partners' dynamic simulations. Although the ability to achieve design optimization is sacrificed to some degree with a sequentially coupled analysis method, the central question here is whether this approach can deliver the required safety and how the differences in the results from the fully coupled method could affect the design. This work summarizes the scope and preliminary results of a study conducted for the Bureau of Safety and Environmental Enforcement aimed at quantifying differences between these approaches through aero-hydro-servo-elastic simulations of two offshore wind turbines on a monopile and jacket substructure.
A Comparison Of Ultimate Loads From Fully And Sequentially Coupled Analyses
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Author :
language : en
Publisher:
Release Date : 2017
A Comparison Of Ultimate Loads From Fully And Sequentially Coupled Analyses written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
This poster summarizes the scope and preliminary results of a study conducted for the Bureau of Safety and Environmental Enforcement aimed at quantifying differences between two modeling approaches (fully coupled and sequentially coupled) through aero-hydro-servo-elastic simulations of two offshore wind turbines on a monopile and jacket substructure.
Loads Analysis Of A Floating Offshore Wind Turbine Using Fully Coupled Simulation
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Author :
language : en
Publisher:
Release Date : 2007
Loads Analysis Of A Floating Offshore Wind Turbine Using Fully Coupled Simulation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Deep-sea mooring categories.
The vast deepwater wind resource represents a potential to use floating offshore wind turbines to power much of the world with renewable energy. Comprehensive simulation tools that account for the coupled excitation and response of the complete system, including the influences of wind-inflow, aerodynamics, structural dynamics, controls, and, for offshore systems, waves, currents, and hydrodynamics, are used to design and analyze wind turbines. The application of such tools in the analysis of floating offshore wind turbines has previously been investigated to only a limited extent. There are numerous possible concepts for floating offshore wind turbine platforms, including a variety of configurations currently used in the offshore oil and gas industries. Coupled analyses are needed to determine their technical and economic feasibility. This paper presents the use of fully coupled aero-hydro-servo-elastic simulation tools to perform a preliminary loads analysis of a 5-MW offshore wind turbine supported by a barge with catenary moorings, which is one of the many promising floating platform concepts.
Dynamics Modeling And Loads Analysis Of An Offshore Floating Wind Turbine
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Author : Jason Mark Jonkman
language : en
Publisher:
Release Date : 2007
Dynamics Modeling And Loads Analysis Of An Offshore Floating Wind Turbine written by Jason Mark Jonkman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Deep-sea mooring categories.
The objectives of the work described in this report are to develop a comprehensive simulation tool that can model the coupled dynamic response of offshore floating wind turbines, verify the simulation capability through model-to-model comparisons, and apply the simulation tool in an integrated loads analysis for one of the promising floating support platform concepts.
Dynamics Modeling And Loads Analysis Of An Offshore Floating Wind Turbine
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Author :
language : en
Publisher:
Release Date : 2007
Dynamics Modeling And Loads Analysis Of An Offshore Floating Wind Turbine written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
This report describes the development, verification, and application of a comprehensive simulation tool for modeling coupled dynamic responses of offshore floating wind turbines.
Wind Wave Misalignment In The Loads Analysis Of A Floating Offshore Wind Turbine Preprint
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Author :
language : en
Publisher:
Release Date : 2014
Wind Wave Misalignment In The Loads Analysis Of A Floating Offshore Wind Turbine Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Wind resources far from the shore and in deeper seas have encouraged the offshore wind industry to look into floating platforms. The International Electrotechnical Commission (IEC) is developing a new technical specification for the design of floating offshore wind turbines that extends existing design standards for land-based and fixed-bottom offshore wind turbines. The work summarized in this paper supports the development of best practices and simulation requirements in the loads analysis of floating offshore wind turbines by examining the impact of wind/wave misalignment on the system loads under normal operation. Simulations of the OC3-Hywind floating offshore wind turbine system under a wide range of wind speeds, significant wave heights, peak-spectral periods and wind/wave misalignments have been carried out with the aero-servo-hydro-elastic tool FAST [4]. The extreme and fatigue loads have been calculated for all the simulations. The extreme and fatigue loading as a function of wind/wave misalignment have been represented as load roses and a directional binning sensitivity study has been carried out. This study focused on identifying the number and type of wind/wave misalignment simulations needed to accurately capture the extreme and fatigue loads of the system in all possible metocean conditions considered, and for a down-selected set identified as the generic US East Coast site. For this axisymmetric platform, perpendicular wind and waves play an important role in the support structure and including these cases in the design loads analysis canimprove the estimation of extreme and fatigue loads. However, most structural locations see their highest extreme and fatigue loads with aligned wind and waves. These results are specific to the spar type platform, but it is expected that the results presented here will be similar to other floating platforms.
Fully Coupled Dynamic Analysis Of A Floating Wind Turbine System
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Author : Jon E. Withee
language : en
Publisher:
Release Date : 2004
Fully Coupled Dynamic Analysis Of A Floating Wind Turbine System written by Jon E. Withee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Wind power categories.
The use of wind power is in a period of rapid growth worldwide and wind energy systems have emerged as a promising technology for utilizing offshore wind resources for the large scale generation of electricity Drawing upon the maturity of wind turbine and floater technologies developed by the wind energy and oil and gas industries, respectively, large offshore wind energy systems have been developed and are being proposed for operation in offshore areas where environmental restrictions are less restrictive, large wind resources exist, and open sea areas are available for wind farm development. A fully coupled dynamic analysis/technique was developed to predict the response of a floating wind turbine system in a stochastic wind and wave environment This technique incorporated both non-linear wave loading on the submerged floater and the aerodynamic loading on the wind turbine A tension leg spar buoy was designed to support the wind turbine This design was chosen due to its relatively small size and hence lower potential cost per wind turbine The system's tethers were attached to the ends of spokes which radiated out from the spar cylinder This arrangement of lines and spokes promised to be very stiff in the roll and pitch modes of motion.
An Integrated Nonlinear Wind Waves Model For Offshore Wind Turbines
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Author : Enzo Marino
language : en
Publisher: Firenze University Press
Release Date : 2010
An Integrated Nonlinear Wind Waves Model For Offshore Wind Turbines written by Enzo Marino and has been published by Firenze University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Coastal engineering categories.
This thesis presents a numerical model capable of simulating offshore wind turbines exposed to extreme loading conditions. External condition-based extreme responses are reproduced by coupling a fully nonlinear wave kinematic solver with a hydro-aero-elastic simulator. First, a two-dimensional fully nonlinear wave simulator is developed. The transient nonlinear free surface problem is formulated assuming the potential theory and a high-order boundary element method is implemented to discretize Laplace's equation. For temporal evolution a second-order Taylor series expansion is used. The code, after validation with experimental data, is successfully adopted to simulate overturning plunging breakers which give rise to dangerous impact loads when they break against wind turbine substructures. Emphasis is then placed on the random nature of the waves. Indeed, through a domain decomposition technique a global simulation framework embedding the numerical wave simulator into a more general stochastic environment is developed. The proposed model is meant as a contribution to meet the more and more pressing demand for research in the offshore wind energy sector as it permits taking into account dangerous effects on the structural response so as to increase the global structural safety level.
Coupled Dynamic Analysis Of Floating Offshore Wind Farms
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Author : Sangyun Shim
language : en
Publisher:
Release Date : 2010
Coupled Dynamic Analysis Of Floating Offshore Wind Farms written by Sangyun Shim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
During the past decade, the demand for clean renewable energy continues to rise drastically in Europe, the US, and other countries. Wind energy in the ocean can possibly be one of those future renewable clean energy sources as long it is economically feasible and technologically manageable. So far, most of the offshore wind farm research has been limited to fixed platforms in shallow-water areas. In the water depth deeper than 30m, however, floating-type wind farms tend to be more feasible. Then, the overall design and engineering becomes more complicated than fixed platforms including the coupled dynamics of platforms, mooring lines, and blades. In the present study, a numerical time-domain model has been developed for the fully coupled dynamic analysis of an offshore floating wind turbine system including blade-rotor dynamics and platform motions. As a test case, the TLP-type floater system with 3 blades of 70-m diameter designed by the National Renewable Energy Laboratory (NREL) is selected to analyze the dynamic coupling effects among floating system, mooring lines, and wind turbine. The performance of the selected system in a typical wind-wave-current condition has been simulated and analyzed. A similar study for the floater and rotor coupled dynamic analysis was conducted by MIT and NREL. However, in the present case, the dynamic coupling between platform and mooring lines are also considered in addition to the rotor-floater dynamic coupling. It is seen that the rotor-floater coupling effects increase with wind velocity and blade size. The increased coupling effects tend to increase the dynamic tension of TLP tethers. The developed technology and numerical tool are applicable to the new offshore floating wind farms planned in the future.
Model Development And Loads Analysis Of A Wind Turbine On A Floating Offshore Tension Leg Platform
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Author :
language : en
Publisher:
Release Date : 2010
Model Development And Loads Analysis Of A Wind Turbine On A Floating Offshore Tension Leg Platform written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
This report presents results of the analysis of a 5-MW wind turbine located on a floating offshore tension leg platform (TLP) that was conducted using the fully coupled time-domain aero-hydro-servo-elastic design code FAST with AeroDyn and HydroDyn. Models in this code are of greater fidelity than most of the models that have been used to analyze floating turbines in the past--which have neglected important hydrodynamic and mooring system effects. The report provides a description of the development process of a TLP model, which is a modified version of a Massachusetts Institute of Technology design derived from a parametric linear frequency-domain optimization process. An extensive loads and stability analysis for ultimate and fatigue loads according to the procedure of the International Electrotechnical Commission offshore wind turbine design standard was performed with the verified TLP model. Response statistics, extreme event tables, fatigue lifetimes, and selected time histories of design-driving extreme events are analyzed and presented. Loads for the wind turbine on the TLP are compared to those of an equivalent land-based turbine in terms of load ratios. Major instabilities for the TLP are identified and described.