Comparison Of Second Order Loads On A Semisubmersible Floating Wind Turbine Preprint
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| Author | : Joao Cruz |
| Publisher | : Springer |
| Total Pages | : 345 |
| Release | : 2016-08-20 |
| Genre | : Technology & Engineering |
| ISBN | : 3319293982 |
This book provides a state-of-the-art review of floating offshore wind turbines (FOWT). It offers developers a global perspective on floating offshore wind energy conversion technology, documenting the key challenges and practical solutions that this new industry has found to date. Drawing on a wide network of experts, it reviews the conception, early design stages, load & structural analysis and the construction of FOWT. It also presents and discusses data from pioneering projects. Written by experienced professionals from a mix of academia and industry, the content is both practical and visionary. As one of the first titles dedicated to FOWT, it is a must-have for anyone interested in offshore renewable energy conversion technologies.
| Author | : I. Bayati |
| Publisher | : |
| Total Pages | : 10 |
| Release | : 2014 |
| Genre | : Hydrodynamics |
| ISBN | : |
The objective of this paper is to assess the second-order hydrodynamic effects on a semisubmersible floating offshore wind turbine. Second-order hydrodynamics induce loads and motions at the sum- and difference-frequencies of the incident waves. These effects have often been ignored in offshore wind analysis, under the assumption that they are significantly smaller than first-order effects. The sum- and difference-frequency loads can, however, excite eigenfrequencies of the system, leading to large oscillations that strain the mooring system or vibrations that cause fatigue damage to the structure. Observations of supposed second-order responses in wave-tank tests performed by the DeepCwind consortium at the MARIN offshore basin suggest that these effects might be more important than originally expected. These observations inspired interest in investigating how second-order excitation affects floating offshore wind turbines and whether second-order hydrodynamics should be included in offshore wind simulation tools like FAST in the future. In this work, the effects of second-order hydrodynamics on a floating semisubmersible offshore wind turbine are investigated.
| Author | : Martin O. L. Hansen |
| Publisher | : Routledge |
| Total Pages | : 192 |
| Release | : 2013-05-13 |
| Genre | : Technology & Engineering |
| ISBN | : 1136572260 |
Aerodynamics of Wind Turbines is the established essential text for the fundamental solutions to efficient wind turbine design. Now in its second edition, it has been entirely updated and substantially extended to reflect advances in technology, research into rotor aerodynamics and the structural response of the wind turbine structure. Topics covered include increasing mass flow through the turbine, performance at low and high wind speeds, assessment of the extreme conditions under which the turbine will perform and the theory for calculating the lifetime of the turbine. The classical Blade Element Momentum method is also covered, as are eigenmodes and the dynamic behaviour of a turbine. The new material includes a description of the effects of the dynamics and how this can be modelled in an ?aeroelastic code?, which is widely used in the design and verification of modern wind turbines. Further, the description of how to calculate the vibration of the whole construction, as well as the time varying loads, has been substantially updated.
| Author | : Emmanuel Branlard |
| Publisher | : Springer |
| Total Pages | : 632 |
| Release | : 2017-04-05 |
| Genre | : Technology & Engineering |
| ISBN | : 3319551647 |
The book introduces the fundamentals of fluid-mechanics, momentum theories, vortex theories and vortex methods necessary for the study of rotors aerodynamics and wind-turbines aerodynamics in particular. Rotor theories are presented in a great level of details at the beginning of the book. These theories include: the blade element theory, the Kutta-Joukowski theory, the momentum theory and the blade element momentum method. A part of the book is dedicated to the description and implementation of vortex methods. The remaining of the book focuses on the study of wind turbine aerodynamics using vortex-theory analyses or vortex-methods. Examples of vortex-theory applications are: optimal rotor design, tip-loss corrections, yaw-models and dynamic inflow models. Historical derivations and recent extensions of the models are presented. The cylindrical vortex model is another example of a simple analytical vortex model presented in this book. This model leads to the development of different BEM models and it is also used to provide the analytical velocity field upstream of a turbine or a wind farm under aligned or yawed conditions. Different applications of numerical vortex methods are presented. Numerical methods are used for instance to investigate the influence of a wind turbine on the incoming turbulence. Sheared inflows and aero-elastic simulations are investigated using vortex methods for the first time. Many analytical flows are derived in details: vortex rings, vortex cylinders, Hill's vortex, vortex blobs etc. They are used throughout the book to devise simple rotor models or to validate the implementation of numerical methods. Several Matlab programs are provided to ease some of the most complex implementations.
| Author | : Arvid Naess |
| Publisher | : Cambridge University Press |
| Total Pages | : 425 |
| Release | : 2013 |
| Genre | : Mathematics |
| ISBN | : 0521881552 |
For students and professionals, this covers theory and methods for stochastic modelling and analysis of marine structures under environmental loads.
| Author | : Peter Jamieson |
| Publisher | : John Wiley & Sons |
| Total Pages | : 467 |
| Release | : 2018-03-12 |
| Genre | : Technology & Engineering |
| ISBN | : 1119137942 |
Aktualisiert und erweiterte Neuauflage dieses umfassenden Leitfadens zu Innovationen in der Entwicklung von Windkraftanlagen Die 2. Auflage von Innovation in Wind Turbine Design beschäftigt sich im Detail mit den Designgrundlagen, erläutert die Entscheidungsgründe für ein bestimmtes Design und beschreibt Methoden zur Bewertung innovativer Systeme und Komponenten. Die 2. Auflage wurde wesentlich erweitert und insgesamt aktualisiert. Neue Inhalte befassen sich mit den theoretischen Grundlagen von Antriebsscheiben in Bezug auf induktionsarme Rotoren. Wesentlich erweitert wurden die Abschnitte zu Offshore-Fragen und Flugwindkraftsystemen. Aktualisierte Inhalte beziehen sich auf Antriebsstränge und die grundlegende Theorie von Planetengetrieben und Differenzialgetrieben. Die Grundlagen der Windenergie und Irrtümer hinsichtlich des Designs von Rotoren mit Luftkanälen, Labor- und Feldtests der Rotorsysteme Katru und Wind Lens werden deutlicher herausgearbeitet. LiDAR wird kurz vorgestellt, ebenso die neuesten Entwicklungen beim Multi-Rotor-Konzept, darunter das Vier-Rotor-System von Vestas. Ein neues Kapitel beschäftigt sich mit dem innovativen DeepWind VAWT. Das Buch ist in vier Hauptabschnitte gegliedert: Hintergrundinformationen zu Designs, Technologiebewertung, Designthemen und innovative Technologiebeispiele. Wichtige Merkmale: - Stark erweiterte und um neue Inhalte ergänzt. - Deckt die Designgrundlagen umfassend ab, erläutert die Entscheidungsgründe für ein bestimmtes Design und beschreibt Methoden zur Bewertung innovativer Systeme und Komponenten. - Enthält innovative Beispiele aus der Praxis. - Jetzt mit Informationen zu den neuesten Entwicklungen in dem Fachgebiet. Dieses Buch ist ein Muss für Windkraftingenieure, Energieingenieure und Turbinenentwickler, Berater, Forscher und Studenten höherer Semester.
| Author | : Tony Burton |
| Publisher | : John Wiley & Sons |
| Total Pages | : 648 |
| Release | : 2001-12-12 |
| Genre | : Technology & Engineering |
| ISBN | : 9780471489979 |
As environmental concerns have focused attention on the generation of electricity from clean and renewable sources wind energy has become the world's fastest growing energy source. The Wind Energy Handbook draws on the authors' collective industrial and academic experience to highlight the interdisciplinary nature of wind energy research and provide a comprehensive treatment of wind energy for electricity generation. Features include: An authoritative overview of wind turbine technology and wind farm design and development In-depth examination of the aerodynamics and performance of land-based horizontal axis wind turbines A survey of alternative machine architectures and an introduction to the design of the key components Description of the wind resource in terms of wind speed frequency distribution and the structure of turbulence Coverage of site wind speed prediction techniques Discussions of wind farm siting constraints and the assessment of environmental impact The integration of wind farms into the electrical power system, including power quality and system stability Functions of wind turbine controllers and design and analysis techniques With coverage ranging from practical concerns about component design to the economic importance of sustainable power sources, the Wind Energy Handbook will be an asset to engineers, turbine designers, wind energy consultants and graduate engineering students.
| Author | : Colin Anderson |
| Publisher | : Cambridge University Press |
| Total Pages | : 325 |
| Release | : 2020-02-20 |
| Genre | : Science |
| ISBN | : 1108478328 |
Explains the key aspects of wind turbine technology and its application in a single readable text.
| Author | : Laura Castro-Santos |
| Publisher | : Springer |
| Total Pages | : 204 |
| Release | : 2016-03-05 |
| Genre | : Technology & Engineering |
| ISBN | : 3319279726 |
This book provides an overview of floating offshore wind farms and focuses on the economic aspects of this renewable-energy technology. It presents economic maps demonstrating the main costs, and explores various important aspects of floating offshore wind farms. It examines topics including offshore wind turbines, floating offshore wind platforms, mooring and anchoring, as well as offshore electrical systems. It is a particularly useful resource in light of the fact that most water masses are deep and therefore not suitable for fixed offshore wind farms. A valuable reference work for students and researchers interested in naval and ocean engineering and economics, this book provides a new perspective on floating offshore wind farms, and makes a useful contribution to the existing literature.
| Author | : N. D. P. Barltrop |
| Publisher | : Butterworth-Heinemann |
| Total Pages | : 785 |
| Release | : 2013-10-22 |
| Genre | : Technology & Engineering |
| ISBN | : 1483162559 |
Dynamics of Fixed Marine Structures, Third Edition proves guidance on the dynamic design of fixed structures subject to wave and current action. The text is an update of the ""UR8"" design guide ""Dynamics of Marine Structures"" with discussion of foundations, wind turbulence, offshore installations, earthquakes, and strength and fatigue. The book employs analytical methods of static and dynamic structural analysis techniques, particularly the statistical and spectral methods when applied to loading and in the calculating dynamic responses. The statistical methods are explained when used to wave, wind, and earthquake calculations, together with the problems encountered in actual applications. Of importance to fixed offshore platforms are the soil properties and foundation covering soil behavior, site investigation, testing, seabed stability, gravity structures, and the use of single piles. Methods of forecasting, measuring, and modeling of waves and currents are also presented in offshore structure construction. Basic hydrodynamics is explained in understanding wave theory, and some description is given to forecasting of environmental conditions that will affect the structures. The effects of vortex-induced vibrations on the structure are explained, and the three methods that can prevent vortex-induced oscillations are given. Wind turbulence or wind loads are analyzed against short natural period or long natural periods of structures. The transportation of offshore platforms, installation, and pile driving, including examples of the applications found in the book, are given as well. The guide is helpful for offshore engineers, designers of inshore jetties, clients needing design and analysis work, specialists related to offshore structural engineering, and students in offshore engineering.
