Analysis Of A Rotatable Wind Turbine Tower By Means Of Aero Servo Elastic Load Aimulations
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Analysis Of A Rotatable Wind Turbine Tower By Means Of Aero Servo Elastic Load Simulations
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Author : Struve, Achim
language : en
Publisher: KIT Scientific Publishing
Release Date : 2021-04-12
Analysis Of A Rotatable Wind Turbine Tower By Means Of Aero Servo Elastic Load Simulations written by Struve, Achim and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-04-12 with Technology & Engineering categories.
This work highlights how the costs and CO2-emissions of land-based wind turbines can be reduced by means of an innovative and material efficient support structure concept. Thereby the yaw system is placed at the tower base, allowing the whole wind turbine tower to be rotated. The potential of a rotatable inclined lattice tower concept was analysed by means of aero-servo-elastic load simulations in the FAST environment. A balance between different cost aspects revealed significant savings.
Analysis Of A Rotatable Wind Turbine Tower By Means Of Aero Servo Elastic Load Aimulations
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Author : Achim Struve
language : en
Publisher:
Release Date : 2020*
Analysis Of A Rotatable Wind Turbine Tower By Means Of Aero Servo Elastic Load Aimulations written by Achim Struve and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020* with categories.
Load Direction Derived Support Structures For Wind Turbines A Lattice Tower Concept And Preparations For Future Certifications Preprint
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Author :
language : en
Publisher:
Release Date : 2017
Load Direction Derived Support Structures For Wind Turbines A Lattice Tower Concept And Preparations For Future Certifications 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 2017 with categories.
The call for more cost-effective and environmentally friendly tower concepts is motivated by tower costs [1] and tower CO2-emission contributions [2], which are high relative to the whole wind turbine system. The proposed rotatable tower concept with yaw bearing at the bottom instead of the top of the tower will provide beneficial economic and environmental impacts to the turbine system. This wind alignment capability indicates a load-direction-derived tower design. By combining this approach with a lattice concept, large material and cost savings for the tower can be achieved. This paper presents a way to analyze and verify the proposed design through aero-servo-elastic simulations, which make future certifications of rotatable tower concepts viable. For this reason, the state-of-the-art, open-source lattice-tower finite-element-method (FEM) module SubDyn [10], developed by the National Renewable Energy Laboratory, has been modified to account for arbitrary member cross-sections. Required changes in the beam element stiffness and mass matrix formulation took place according to an energy method [13]. All validated adaptions will be usable within the aero-servo-elastic simulation framework FAST and are also beneficial for other nonrotatable lattice structures.
Design Of Cast Steel Components Under Cyclic Loading
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Author : Nagel, Sven
language : en
Publisher: KIT Scientific Publishing
Release Date : 2022-05-27
Design Of Cast Steel Components Under Cyclic Loading written by Nagel, Sven and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-05-27 with Technology & Engineering categories.
This work presents a design approach that links fatigue resistance of cast steel component to permissible defect sizes. It is based on fractures mechanics, is in line with experiences of the last 60 years and validated by extensive experimental as well as numerical investigations on different scales and under consideration of real casting defects. By following established assessment methods, the design concept is adapted to practical building applications.
Finite Element Simulation Of Residual Stresses From Welding And High Frequency Hammer Peening
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Author : Gkatzogiannis, Stefanos
language : en
Publisher: KIT Scientific Publishing
Release Date : 2022-06-30
Finite Element Simulation Of Residual Stresses From Welding And High Frequency Hammer Peening written by Gkatzogiannis, Stefanos and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-30 with Technology & Engineering categories.
Research goal of the present monograph is the establishment of an efficient engineering approach, which will include straightforward but accurate simulation models, in order to estimate the residual stress fields of welded joints introduced during welding and their post-weld treatment with High Frequency Hammer Peening. The present subject lies on the intersection of structural engineering, material science and computational mechanics.
Reliability Based Optimization Of Floating Wind Turbine Support Structures
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Author : Mareike Leimeister
language : en
Publisher: Springer Nature
Release Date : 2023-01-01
Reliability Based Optimization Of Floating Wind Turbine Support Structures written by Mareike Leimeister and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-01-01 with Technology & Engineering categories.
This book pursues the ambitious goal of combining floating wind turbine design optimization and reliability assessment, which has in fact not been done before. The topic is organized into a series of very ambitious objectives, which start with an initial state-of-the-art review, followed by the development of high-fidelity frameworks for a disruptive way to design next generation floating offshore wind turbine (FOWT) support structures. The development of a verified aero-hydro-servo-elastic coupled numerical model of dynamics for FOWTs and a holistic framework for automated simulation and optimization of FOWT systems, which is later used for the coupling of design optimization with reliability assessment of FOWT systems in a computationally and time-efficient manner, has been an aim of many groups internationally towards implementing a performance-based/goal-setting approach in the design of complex engineering systems. The outcomes of this work quantify the benefits of an optimal design with a lower mass while fulfilling design constraints. Illustrating that comprehensive design methods can be combined with reliability analysis and optimization algorithms towards an integrated reliability-based design optimization (RBDO) can benefit not only the offshore wind energy industry but also other applications such as, among others, civil infrastructure, aerospace, and automotive engineering.
Wind Turbine Aerodynamics And Vorticity Based Methods
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Author : Emmanuel Branlard
language : en
Publisher: Springer
Release Date : 2017-04-05
Wind Turbine Aerodynamics And Vorticity Based Methods written by Emmanuel Branlard and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-04-05 with Technology & Engineering categories.
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.
Elastic Actuator Line Modelling For The Wake Induced Fatigue Analysis Of Horizontal Wind Turbine
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Author : Hang Meng
language : en
Publisher:
Release Date : 2018
Elastic Actuator Line Modelling For The Wake Induced Fatigue Analysis Of Horizontal Wind Turbine written by Hang Meng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Metals categories.
The fatigue damage on wind turbine blades will threaten the safety and stability of the wind turbine and thus lower the efficiency and economy of the power generation system. The wake-induced fatigue plays an important role in this fatigue damage, which has not been deeply studied in the previous research of this domain. This is because the calculation of fatigue damage on a wind turbine blade under wake conditions will include the knowledge of wind turbine wake (fluid mechanics), composite structure modelling (solid structure modelling), aero-elastic modelling (coupling between fluid and structures), and fatigue analysis. Moreover, the anisotropic composite wind turbine blade, e.g. bendtwist coupling blade, will also bring challenges for the structural modelling. To propose a model to solve the above problems holistically is the motivation of the thesis. In this thesis, to construct the aero-elastic model under wake conditions for fatigue analysis, the elastic actuator line model is proposed and verified. To consider the anisotropic properties of composite wind turbine blade, e.g. bend-twist coupling wind turbine blade, the anisotropic wind turbine blade structure model is constructed. Based on the structure model and cross sectional analysis method (BECAS), the fatigue analysis methodology is proposed. Due to the similarity between the anisotropic wind turbine blade structure model and Maxwell's equation (electromagnetic equations), the FDTD method, which is a FDM based method and long been used in electromagnetic simulation, is applied to construct a novel anisotropic wind turbine blade structure model. Specifically, firstly, the actuator line model is validated in terms of thrust coefficient and flow field prediction. It is found that the nacelle effect has impact on the velocity profile around wake center region. And the proposed single-point nacelle model, single momentum source point smeared by Gaussian function, can be used to correct the prediction not only for RANS turbulence model but also for LES turbulence model. Secondly, Based on NREL SOWFA, the elastic actuator line model is constructed as an aero-elastic model for wake conditions to simulate the dynamic loading of wind turbine blade. The stochastic and deterministic wake-induced fatigue loading are reproduced by the proposed elastic actuator line model. Compared with the explicit elastic actuator line model, the implicit elastic actuator line can run with larger time step. However, the accuracy of implicit method will decrease. Thirdly, the performance of normal and bend-twist coupling wind turbine blade with anisotropic composite materials in wake conditions are studied by using the fatigue analysis methodology based on anisotropic structure model, cross sectinal analysis, and fatigue analysis method. Based on this fatigue analysis methodology, the fatigue life of NREL 5MW wind turbine blade is analysed. The predicted fatigue life (26.0187 years) of the main structure (spar caps) is very close to the design life (20 years). From the fatigue analysis for wind turbines in wake conditions, it is found that the wake-induced fatigue has a significant impact on the fatigue life of wind turbine blades (fatigue life drops from 26.0187 years to 1.7388 years under compact layout). And wind farm layout can affect the wake-induced fatigue damage (increase from 1.7388 years (compact layout) to 6.9084 years (normal layout)). Furthermore, it is also found that the bend-twist coupling wind turbine blade can alleviate the fatigue load under wake condition. Lastly, the structure model based on FDTD method is constructed for anisotropic wind turbine blade and validated in terms of beams with deformation coupling, non-inertia coordinate system, and non-uniform sections (real wind turbine blade). The stability analysis for the proposed FDTD model is carried out, which shows that the root cause of the numerical instability for the proposed method is the highest-frequency mode in numerical model. Based on this analysis, the unconditionally stable explicit FDTD structure model is proposed and constructed, which strikes a balance between accuracy and efficiency. Compared with implicit method, the unconditionally stable explicit FDTD model overcomes its limitations on time step with little effect on its solution accuracy.
Mare Wint
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Author : Wiesław Ostachowicz
language : en
Publisher: Springer
Release Date : 2016-08-30
Mare Wint written by Wiesław Ostachowicz and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-30 with Technology & Engineering categories.
This book provides a holistic, interdisciplinary overview of offshore wind energy, and is a must-read for advanced researchers. Topics, from the design and analysis of future turbines, to the decommissioning of wind farms, are covered. The scope of the work ranges from analytical, numerical and experimental advancements in structural and fluid mechanics, to novel developments in risk, safety & reliability engineering for offshore wind.The core objective of the current work is to make offshore wind energy more competitive, by improving the reliability, and operations and maintenance (O&M) strategies of wind turbines. The research was carried out under the auspices of the EU-funded project, MARE-WINT. The project provided a unique opportunity for a group of researchers to work closely together, undergo multidisciplinary doctoral training, and conduct research in the area of offshore wind energy generation. Contributions from expert, external authors are also included, and the complete work seeks to bridge the gap between research and a rapidly-evolving industry.
Aeroelastic Simulation Of Wind Turbines Using Free Vortex Methods And Strategies For Accelerating The Computation
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Author : Shujian Liu
language : en
Publisher:
Release Date : 2018
Aeroelastic Simulation Of Wind Turbines Using Free Vortex Methods And Strategies For Accelerating The Computation written by Shujian Liu 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.
This dissertation integrated the free vortex method code Wake Induced Dynamics Simulator (WInDS), which was developed by Sebastian et al., into the open source and widely-used software FAST. A range of computational strategies including paral- lelization and Treecode algorithms are used to increase the computational efficiency of the software. Full aero-hydro-servo-elastic simulations with free vortex method are conducted, which focus on an in-depth study on the influence of the aeroelasticity of the wind turbine and platform motions on the unsteadiness of the aerodynamics, and the comparison of aeroelastic responses of two floating wind turbine concepts. This dissertation also applies long short-term memory (LSTM) architecture for fast wind power prediction.