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Computation Of Wave Loads Under Multidirectional Sea States For Floating Offshore Wind Turbines Preprint
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Book Synopsis Computation of Wave Loads under Multidirectional Sea States for Floating Offshore Wind Turbines: Preprint by :
Download or read book Computation of Wave Loads under Multidirectional Sea States for Floating Offshore Wind Turbines: Preprint written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper focuses on the analysis of a floating wind turbine under multidirectional wave loading. Special attention is given to the different methods used to synthesize the multidirectional sea state. This analysis includes the double-sum and single-sum methods, as well as an equal-energy discretization of the directional spectrum. These three methods are compared in detail, including theergodicity of the solution obtained. From the analysis, the equal-energy method proved to be the most computationally efficient while still retaining the ergodicity of the solution. This method was chosen to be implemented in the numerical code FAST. Preliminary results on the influence of these wave loads on a floating wind turbine showed significant additional roll and sway motion of theplatform.
Book Synopsis Computation of wave loads under multidirectional sea states for floating offshore wind turbines by : T. Duarte
Download or read book Computation of wave loads under multidirectional sea states for floating offshore wind turbines written by T. Duarte and published by . This book was released on 2014 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wave Loads on Offshore Wind Turbines by :
Download or read book Wave Loads on Offshore Wind Turbines written by and published by . This book was released on 2015 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean energy is one of the most important sources of alternative energy and offshore floating wind turbines are considered viable and economical means of harnessing ocean energy. The accurate prediction of nonlinear hydrodynamic wave loads and the resulting nonlinear motion and tether tension is of crucial importance in the design of floating wind turbines. A new theoretical framework is presented for analyzing hydrodynamic forces on floating bodies which is potentially applicable in a wide range of problems in ocean engineering. The total fluid force acting on a floating body is obtained by the time rate of change of the impulse of the velocity potential flow around the body. This new model called Fluid Impulse Theory is used to address the nonlinear hydrodynamic wave loads and the resulting nonlinear responses of floating wind turbine for various wave conditions in a highly efficient and robust manner in time domain. A three-dimensional time domain hydrodynamic wave-body interaction computational solver is developed in the frame work of a boundary element method based on the transient free-surface Green-function. By applying a numerical treatment that takes the free-surface boundary conditions linearized at the incident wave surface and takes the body boundary condition satisfied on the instantaneous underwater surface of the moving body, it simulates a potential flow in conjunction with the Fluid Impulse Theory for nonlinear wave-body interaction problems of large amplitude waves and motions in time domain. Several results are presented from the application of the Fluid Impulse Theory to the extreme and fatigue wave load model: the time domain analysis of nonlinear dynamic response of floating wind turbine for extreme wave events and the time domain analysis of nonlinear wave load for an irregular sea state followed by a power spectral density analysis.
Book Synopsis An Efficient Numerical Scheme for Simulating Unidirectional Irregular Waves Based on a Hybrid Wave Model by : Dongxing Jia
Download or read book An Efficient Numerical Scheme for Simulating Unidirectional Irregular Waves Based on a Hybrid Wave Model written by Dongxing Jia and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Unidirectional Hybrid Wave Model (UHWM) predicts irregular wave kinematics and pressure accurately in comparison with its linear counterpart and modification, especially near the free surface. Hence, in using the Morrison equation it has been employed in the computation of wave loads on a moored floating structure, such as Spar or TLP (Tension Leg Platform), which can be approximated by a slender body or a number of slender components. Dr. Jun Zhang, with his former and current graduate students, have developed a numerical code, known as COUPLE, over the past two decades, simulating 6 Degree Of Freedom (DOF) motions of a moored floating structures interacting with waves, current and wind. COUPLE employs UHWM as a module for computing wave loads on a floating structure. However, when the duration of simulating the wave-structure interaction is long, say 3 hours (typically required by the offshore industry for extreme storm cases), the computation time of using UHWM increases significantly in comparisons with the counterpart based upon linear wave theory. This study is to develop a numerical scheme which may significantly reduce the CPU time in the use of UHWM and COUPLE. In simulating irregular (or random) waves following a JONSWAP spectrum of a given cut off frequency, the number of free wave components in general grows linearly with the increase of the simulation duration. The CPU time for using a linear spectral method to simulate irregular waves is roughly proportion to N2, where N is the number of free wave components used in simulating irregular waves, while that for using a nonlinear wave model, such as UHWM, it is roughly proportional to N3. Therefore, to reduce the CPU time, the total simulation duration is divided into a number of segments. However, due to the nature of Fast Fourier Transform (FFT), the connection between the two neighboring surface elevations segments is likely discontinuous. To avoid the discontinuity, an overlapped duration between the two neighboring segments is adopted. For demonstration, a free-wave spectrum is input to COUPLE for simulating the 6 DOF motions of a floating 5-MW wind turbine installed on an OC3 moored Spar and tensions in the mooring lines. It is shown that the CPU time for the above simulation for duration of 2048 seconds is reduced from more than16 hours when the irregular wave elevation and kinematics are calculated without dividing into segments to less than three hours when those are calculated by dividing into five segments. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148395
Book Synopsis High-fidelity Simulation and Analysis of a Floating Offshore Wind Turbine Under Extreme Wave and Wind Conditions by : Friedemann Borisade
Download or read book High-fidelity Simulation and Analysis of a Floating Offshore Wind Turbine Under Extreme Wave and Wind Conditions written by Friedemann Borisade and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Suitability of Wave Loading Models for Offshore Wind Turbine Monopiles in Rough Seas by : Agota Mockute
Download or read book Suitability of Wave Loading Models for Offshore Wind Turbine Monopiles in Rough Seas written by Agota Mockute and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stochastic Variables in Modelling of the Wave Loads on Offshore Wind Turbine Structures by : Ana Glisic
Download or read book Stochastic Variables in Modelling of the Wave Loads on Offshore Wind Turbine Structures written by Ana Glisic and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling Nonlinear Stochastic Ocean Loads as Diffusive Stochastic Differential Equations to Derive the Dynamic Responses of Offshore Wind Turbines by : David F. H. Larson
Download or read book Modeling Nonlinear Stochastic Ocean Loads as Diffusive Stochastic Differential Equations to Derive the Dynamic Responses of Offshore Wind Turbines written by David F. H. Larson and published by . This book was released on 2016 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: A procedure is developed for modeling stochastic ocean wave and wind loads as diffusive stochastic differential equations (SDE) in a state space form to derive the response statistics of offshore structures, specifically wind turbines. Often, severe wind and wave systems are highly nonlinear and thus treatment as linear systems is not applicable, leading to computationally expensive Monte Carlo simulations. Using Stratonovich-form diffusive stochastic differential equations, both linear and nonlinear components of the wind thrust can be modeled as 2 state SDE. These processes can be superposed with both the linear and nonlinear (inertial and viscous) wave forces, also modeled as a multi-dimensional state space SDE. Furthermore, upon implementing the ESPRIT algorithm to fit the autocorrelation function of any real sea state spectrum, a simple 2-state space model can be derived to completely describe the wave forces. The resulting compound state-space SDE model forms the input to a multi-dimension state-space Fokker-Planck equation, governing the dynamical response of the wind turbine structure. Its solution yields response, fatigue and failure statistics-information critical to the design of any offshore structure. The resulting Fokker-Planck equation can be solved using existing numerical schemes.
Book Synopsis SImulation-length Requirements in the Loads Analysis of Offshore Floating Wind Turbines by : Lorenz Haid
Download or read book SImulation-length Requirements in the Loads Analysis of Offshore Floating Wind Turbines written by Lorenz Haid and published by . This book was released on 2013 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preprints - Offshore Technology Conference by :
Download or read book Preprints - Offshore Technology Conference written by and published by . This book was released on 1970 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 9th Australasian Conference on Coastal and Ocean Engineering, Adelaide, 4-8 December 1989 by :
Download or read book 9th Australasian Conference on Coastal and Ocean Engineering, Adelaide, 4-8 December 1989 written by and published by . This book was released on 1989 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preprints of papers read at the Dec. 1989 meeting in Adelaide. It is Institute of Engineers, Australia National Conference Publication no. 89/20. They deal with: results of theoretical and experimental research; data collection analysis and interpretation; estuary and lagoon hydrodynamics; coastal erosion and protection; environmental aspects of beaches and estuaries; strategies for long-term coastal management; and offshore engineering. No index. Acidic paper. Annotation copyrighted by Book News, Inc., Portland, OR
Book Synopsis Floating Offshore Wind Energy by : Joao Cruz
Download or read book Floating Offshore Wind Energy written by Joao Cruz and published by Springer. This book was released on 2016-08-20 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Ocean Wave Energy written by Joao Cruz and published by Springer Science & Business Media. This book was released on 2007-12-22 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors of this timely reference provide an updated and global view on ocean wave energy conversion – and they do so for wave energy developers as well as for students and professors. The book is orientated to the practical solutions that this new industry has found so far and the problems that any device needs to face. It describes the actual principles applied to machines that convert wave power to electricity and examines state-of-the-art modern systems.
Book Synopsis Ocean Wave Energy Conversion by : Aurelien Babarit
Download or read book Ocean Wave Energy Conversion written by Aurelien Babarit and published by Elsevier. This book was released on 2017-11-17 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The waves that animate the surface of the oceans represent a deposit of renewable energy that for the most part is still unexploited today. This is not for lack of effort, as for more than two hundred years inventors, researchers and engineers have struggled to develop processes and systems to recover the energy of the waves. While all of these efforts have failed to converge towards a satisfactory technological solution, the result is a rich scientific and technical literature as well as extensive and varied feedback from experience. For the uninitiated, this abundance is an obstacle. In order to facilitate familiarization with the subject, we propose in this work a summary of the state of knowledge on the potential of wave energy as well as on the processes and technologies of its recovery (wave energy converters). In particular, we focus on the problem of positioning wave energy in the electricity market, the development of wave energy conversion technologies from a historical perspective, and finally the energy performance of the devices. This work is aimed at students, researchers, developers, industry professionals and decision makers who wish to acquire a global perspective and the necessary tools to understand the field. Reviews the state of knowledge and developments on wave energy recovery Presents the history of wave energy recovery Classifies the various systems for recovering this type of energy
Book Synopsis Journal of Offshore Mechanics and Arctic Engineering by :
Download or read book Journal of Offshore Mechanics and Arctic Engineering written by and published by . This book was released on 1987 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bramwell's Helicopter Dynamics by : A. R. S. Bramwell
Download or read book Bramwell's Helicopter Dynamics written by A. R. S. Bramwell and published by Elsevier. This book was released on 2001-04-06 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the original publication of 'Bramwell's Helicopter Dynamics' in 1976, this book has become the definitive text on helicopter dynamics and a fundamental part of the study of the behaviour of helicopters. This new edition builds on the strengths of the original and hence the approach of the first edition is retained. The authors provide a comprehensive overview of helicopter aerodynamics, stability, control, structural dynamics, vibration, aeroelastic and aeromechanical stability. As such, Bramwell's Helicopter Dynamics is essential for all those in aeronautical engineering. THE single volume comprehensive guide for anyone working with helicopters Written by leading worldwide experts in the field
Book Synopsis Submerged and Floating Photovoltaic Systems by : Marco Rosa-Clot
Download or read book Submerged and Floating Photovoltaic Systems written by Marco Rosa-Clot and published by Academic Press. This book was released on 2017-11-16 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Submerged and Floating Photovoltaic Systems: Modelling, Design and Case Studies investigates how the use of photovoltaic systems in and on the water can create a positive synergy by increasing the cost effectiveness of PV systems, satisfying the local energy demand and creating positive effects on water. Tina and Rosa-Clot combine their wealth of experience to present a theoretical, numerical, experimental and design-focused analysis of water-integrated PV systems. The book is dedicated to providing a very accessible and understandable analysis of the theoretical and modeling aspects of these PV systems. The authors explore and analyze many existing projects and case studies which provide the reader with an understanding of common design and installation problems, as well as a thorough economic study to help the reader justify the adoption of this very clean method of creating renewable energy. Investigates the installation of photovoltaic systems and storage systems over and under the water’s surface Offers theoretical and practical explanations of how to study, analyze and design photovoltaic energy systems which are complemented by MATLAB simulations for an enhanced learning experience Considers how the use of submerged and floating photovoltaic systems can work to fulfill domestic energy demand
