Loads Analysis Of A Floating Offshore Wind Turbine Using Fully Coupled Simulation
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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 categories.
This paper presents the use of fully coupled aero-hydro-servo-elastic simulation tools to perform a loads analysis of a 5-MW offshore wind turbine supported by a barge with moorings, one of many promising floating platform concepts.
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.
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.
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 Deep-sea moorings 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.
Model Development And Loads Analysis Of An Offshore Wind Turbine On A Tension Leg Platform With A Comparison To Other Floating Turbine Concepts
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Author : Denis Matha
language : en
Publisher:
Release Date : 2010
Model Development And Loads Analysis Of An Offshore Wind Turbine On A Tension Leg Platform With A Comparison To Other Floating Turbine Concepts written by Denis Matha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Deep-sea moorings 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. The report also provides a description of the development process of the TLP model. The model has been verified via comparisons to frequency-domain calculations. Important differences have been identified between the frequency-domain and time-domain simulations, and have generated implications for the conceptual design process. An extensive loads and stability analysis for ultimate and fatigue loads according to the procedure of the IEC 61400-3 offshore wind turbine design standard was performed with the verified TLP model. This report compares the loads for the wind turbine on the TLP to those of an equivalent land-based turbine. Major instabilities for the TLP are identified and described.
Model Development And Loads Analysis Of An Offshore Wind Turbine On A Tension Leg Platform With A Comparison To Other Floating Turbine Concepts
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Author : Denis Matha
language : en
Publisher:
Release Date : 2010
Model Development And Loads Analysis Of An Offshore Wind Turbine On A Tension Leg Platform With A Comparison To Other Floating Turbine Concepts written by Denis Matha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Deep-sea moorings 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. The report also provides a description of the development process of the TLP model. The model has been verified via comparisons to frequency-domain calculations. Important differences have been identified between the frequency-domain and time-domain simulations, and have generated implications for the conceptual design process. An extensive loads and stability analysis for ultimate and fatigue loads according to the procedure of the IEC 61400-3 offshore wind turbine design standard was performed with the verified TLP model. This report compares the loads for the wind turbine on the TLP to those of an equivalent land-based turbine. Major instabilities for the TLP are identified and described.
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 Simulation And Analysis Of A Floating Offshore Wind Turbine
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Author : Mohammed Khair Al-Solihat
language : en
Publisher:
Release Date : 2018
Dynamics Modeling Simulation And Analysis Of A Floating Offshore Wind Turbine written by Mohammed Khair Al-Solihat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
" Floating Offshore Wind Turbines (FOWTs) are a promising technology to harness the abundant offshore wind energy resources in open ocean areas. A FOWT consists of a floating platform, the moorings, and the wind turbine structure (tower + Rotor-Nacelle Assembly (RNA)). The main focus of this thesis is to develop multibody dynamic models that integrate the structural dynamics, and hydrostatic, hydrodynamic, aerodynamic and mooring system loads. Special efforts are also devoted to characterize the mooring and hydrostatic loads as main sources of systems stiffness that shapes the dynamic behavior of the system. Two approaches for modeling the platform/tower dynamics are developed, a rigid multibody model and a coupled rigid-flexible multibody model. Both models treat the platform, nacelle and rotor as six-degrees-of-freedom (6-DOF) rigid bodies. However, modeling the wind turbine tower dynamics differs between these approaches. The rigid model considers the tower as a 6-DOF rigid body while the flexible model represents the tower as a three-dimensional (3D) tapered damped Euler-Bernoulli beam undergoing coupled general rigid body and elastic motions. In both approaches, the wind turbine drivetrain dynamics is also considered to capture the rotor spin response. The equations of motions of both models are derived symbolically using Lagrange's equations. The hydrostatic restoring loads are evaluated through development of a novel nonlinear hydrostatic approach. This approach allows evaluating the exact hydrostatic force and moment and position of the center of buoyancy as function of the platform displacement and finite rotation. New exact expressions for the water plane area restoring moments are developed. The hydrostatic stiffness matrix at an arbitrary position and orientation of the platform is subsequently derived. A quasi-static approach is then developed to determine the cable tensions of the single-segment and multi-segment mooring system configurations proposed to moor the platform to the seabed. The approach uses different governing equations, depending on whether the mooring lines partially rest on the seabed; are suspended; or fully taut. The exact mooring stiffness is subsequently derived and the influence of several mooring system parameters on the mooring system stiffness is investigated. As an alternative to the quasi-static cable model, a lumped mass cable model incorporating the cable-seabed contact effect is developed to integrate the cable dynamics into the FOWT system dynamics. The equations of motion of the mooring line nodes are assembled for the two mooring system configurations under consideration. A new methodology is also presented to calculate the equilibrium profile of the mooring line lying on a seabed as desirable initial conditions for solving the discretized cable equations of motion. Finally, the theoretical models are implemented through a large simulation tool to analyze the dynamic behavior of the spar FOWT system under study. A series of simulations under defined external loads (load cases) are performed to validate the dynamic models. The simulation results are compared with similar results obtained from well-known offshore wind design codes. The simulation results are found to be in very good agreement with the reported results. Numerical experiments are also performed to investigate the influence of the tower flexibility, mooring system configuration, tower twist and cable dynamics on the system dynamic behavior. The results show that the system responses obtained from the rigid body model under-predict the platform yaw response and exhibit less damping than those obtained from the flexible model. It is also found that the mooring system configuration choice does not influence the platform roll and pitch responses or tower elastic deflections." --
Development Of Fully Coupled Aeroelastic And Hydrodynamic Models For Offshore Wind Turbines
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Author : Jason Mark Jonkman
language : en
Publisher:
Release Date : 2006
Development Of Fully Coupled Aeroelastic And Hydrodynamic Models For Offshore Wind Turbines 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 2006 with Deep-sea moorings categories.
Aeroelastic simulation tools are routinely used to design and analyze onshore wind turbines, in order to obtain cost effective machines that achieve favorable performance while maintaining structural integrity. These tools employ sophisticated models of wind-inflow; aerodynamic, gravitational, and inertial loading of the rotor, nacelle, and tower; elastic effects within and between components; and mechanical actuation and electrical responses of the generator and of control and protection systems. For offshore wind turbines, additional models of the hydrodynamic loading in regular and irregular seas, the dynamic coupling between the support platform motions and wind turbine motions, and the dynamic characterization of mooring systems for compliant floating platforms are also important. Hydrodynamic loading includes contributions from hydrostatics, wave radiation, and wave scattering, including free surface memory effects. The integration of all of these models into comprehensive simulation tools, capable of modeling the fully coupled aeroelastic and hydrodynamic responses of floating offshore wind turbines, is presented.
Development Of Fully Coupled Aeroelastic And Hydrodynamic Models For Offshore Wind Turbines
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Author : J. M. Jonkman
language : en
Publisher:
Release Date : 2006
Development Of Fully Coupled Aeroelastic And Hydrodynamic Models For Offshore Wind Turbines written by J. M. Jonkman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.