scholarly journals Critical assessment of non-linear hydrodynamic load models for a fully flexible monopile offshore wind turbine

2018 ◽  
Vol 164 ◽  
pp. 87-104 ◽  
Author(s):  
Loup Suja-Thauvin ◽  
Jørgen R. Krokstad ◽  
Erin E. Bachynski
Keyword(s):  
Wind Turbine ◽  
Critical Assessment ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Hydrodynamic Load ◽  
Load Models ◽  
Non Linear

Dynamic Response of a Semi-Submersible Floating Offshore Wind Turbine in Storm Condition

2012 ◽  
Vol 260-261 ◽  
pp. 273-278 ◽  
Author(s):  
Hai Tao Wu ◽  
Jin Jiang ◽  
Jing Zhao ◽  
Xiao Rong Ye
Keyword(s):  
Dynamic Response ◽  
Wind Turbine ◽  
Time History ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Offshore Platforms ◽  
Hydrodynamic Load ◽  
Floating Offshore Wind Turbine ◽  
The Time Domain ◽  
Storm Condition

The paper focuses on a semi-submersible floating offshore wind turbine (FOWT) and analyses its dynamic response in storm condition. The wind load is calculated based on wind block model; the hydrodynamic load is modeled using Potential Theory and Morison Equation. The time-domain dynamic response of the FOWT is simulated by SESAM software with duration of 3 hours. The performance of the FOWT is analyzed based on time history responses and response spectrums. The results show some unique characteristics that differ from offshore platforms and the analysis proofs that the performance is acceptable and the design is reliable.

Non-Linear Response Analysis of Jacket Supported Offshore Wind Turbine under Seismic Loads using Hilbert-Huang Transform

2021 ◽  
Author(s):  
Subham Kashyap ◽  
Nilanjan Saha ◽  
K. A. Abhinav
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Offshore Wind ◽  
Resonance Phenomenon ◽  
Complete Analysis ◽  
Offshore Wind Turbine ◽  
Site Class ◽  
Hilbert Huang Transform ◽  
Class D ◽  
Non Linear

Abstract The present work studies the performance of an offshore wind turbine system in an earthquake coupled with wave and wind loading. The NREL 5 MW offshore wind turbine, supported on the OC4 jacket [14], has been analysed within a finite element framework. A coupled model of hydrodynamics and soil-structure interaction has been implemented. The structure-foundation system is analysed under earthquakes recorded close to offshore waters and at sites with shear-wave velocities, classified under Site-Class D or Site-Class E as per API RP: 2EQ [8]. The soil conditions emulate characteristics of a prospective offshore wind turbine site along the west coast of India, which falls within the Site-Class D classification mentioned above. The geotechnical modelling is done as per the soil curves prescribed by the non-linear Winkler springs along the pile’s length. The complete analysis has been processed in a finite-element framework through the commercial program USFOS [16]. The Hilbert-Huang transform [29] of the tower-responses suggests the increased vulnerability to the resonance phenomenon with 1P and 3P loading. It also suggests an involvement of higher modes in the tower-response. The change in the frequency of the structure-foundation system during and post-earthquake has also been studied.

scholarly journals Geotechnical aspects of offshore wind turbine dynamics from 3D non-linear soil-structure simulations

2019 ◽  
Vol 120 ◽  
pp. 181-199 ◽  
Author(s):  
Evangelos Kementzetzidis ◽  
Simone Corciulo ◽  
Willem G. Versteijlen ◽  
Federico Pisanò
Keyword(s):  
Wind Turbine ◽  
Soil Structure ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Non Linear

Modeling a Non-Linear Mooring System for Floating Offshore Wind Using a Hydraulic Cylinder Analogy

2019 ◽  
Author(s):  
Magnus J. Harrold ◽  
Philipp R. Thies ◽  
David Newsam ◽  
Claudio Bittencourt Ferreira ◽  
Lars Johanning
Keyword(s):  
Numerical Model ◽  
Wind Turbine ◽  
Hydrodynamic Stability ◽  
Dynamic Performance ◽  
Hydraulic Cylinder ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Mooring System ◽  
Linear Deformation ◽  
Non Linear

Abstract The mooring system for a floating offshore wind turbine is a critical sub-system that ensures the safe station keeping of the platform and has a key influence on hydrodynamic stability. R&D efforts have increasingly explored the benefits of nonlinear mooring systems for this application, as they have the potential to reduce the peak mooring loads and fatigue cycling, ultimately reducing the system cost. This paper reports on a hydraulic based mooring component that possesses these characteristics, attributable mostly to the non-linear deformation of a flexible bladder. This is not a typical hydraulic component and, as a consequence, modeling its dynamic performance is non-trivial. This paper addresses this by introducing an analogy to numerically model the system, in which the functionality of the mooring component is compared to that of a hydraulic cylinder. The development of a working model in Simscape Fluids is outlined, and is subsequently used to simulate the IMS in a realistic environment. It is found that the numerical model captures a number of the dynamic performance characteristics observed in a previously tested prototype of the IMS.

scholarly journals Alternative linearisation methodology for aero-elastic Floating Offshore Wind Turbine non-linear models

2018 ◽  
Vol 1037 ◽  
pp. 062019 ◽  
Author(s):  
Joannes Olondriz ◽  
Josu Jugo ◽  
Iker Elorza ◽  
Santiago Alonso-Quesada ◽  
Aron Pujana-Arrese
Keyword(s):  
Wind Turbine ◽  
Linear Models ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Floating Offshore Wind Turbine ◽  
Non Linear

Hydrodynamic and Aerodynamic Loads on the Behaviour of Offshore Wind Farm

2011 ◽  
Author(s):  
Wei Gong
Keyword(s):  
Wind Turbine ◽  
Wind Farm ◽  
Wave Theory ◽  
Wind Load ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Offshore Wind Farm ◽  
Wave Load ◽  
Aerodynamic Loads ◽  
Load Models

Renewable energy provides a solution for complex current and future social and environmental problems whereas offshore industry has a large potential for providing renewable energy for future. Currently, offshore technology making use of wind for energy generation purpose becomes a hot spot with highly advanced research and development going on on one side and complex and critical problems present and difficult to solve on the other. This paper is trying to study problems related to the quantification of the hydrodynamic and aerodynamic loads for the design of offshore wind turbine support structures in the offshore wind farm. Both the hydrodynamic and aerodynamic conditions in the offshore site are extremely complex resulting in the difficulty of reasonable determination for the external loads on the wind turbine support structures. However, due to the increasing global demands for future energy solution, the design, analysis and optimization of offshore wind turbine is nevertheless an important issue. The paper first gives an introduction of the offshore wind farm and the complexity of the offshore environment. Wave load is explored with introduction of existing wave load models, comparison of their characteristics while the focus is placed on the nonlinear wave load by means of the Stokes higher order wave theory. Properties of a single regular wave based on methods of linear wave theory and Stokes higher order wave theory are compared which lead to differences in the results of wave load models when these two different methods are used. Wind load model is introduced briefly, followed by the introduction of current methods for determination or approximation of combined wave and wind load and also recommendations for practice. Park effect of the wind load and wave load is also introduced at limited depth in the latter stage as a direction for future research. Conclusion and recommendations based on all the above are therefore given at the last section of the paper.

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