A method for identification of an effective Winkler foundation for large-diameter offshore wind turbine support structures based on in-situ measured small-strain soil response and 3D modelling

2016 ◽  
Vol 124 ◽  
pp. 221-236 ◽  
Author(s):  
W.G. Versteijlen ◽  
A.V. Metrikine ◽  
K.N. van Dalen
Keyword(s):  
Wind Turbine ◽  
Large Diameter ◽  
Small Strain ◽  
3D Modelling ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Winkler Foundation ◽  
Support Structures ◽  
Soil Response

scholarly journals Finite Element Modelling and In Situ Modal Testing of an Offshore Wind Turbine

2018 ◽  
Vol 6 (2) ◽  
pp. 101-106 ◽  
Author(s):  
Erfan Asnaashari ◽  
Andy Morris ◽  
Ian Andrew ◽  
Wolfgang Hahn ◽  
Jyoti K. Sinha
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Finite Element Modelling ◽  
Modal Testing ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Element Modelling

Fatigue Life Analysis of Offshore Wind Turbine Support Structures in an Offshore Wind Farm

2018 ◽  
Author(s):  
Bryan Nelson ◽  
Yann Quéméner
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Wind Farm ◽  
The Body ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Analysis Tool ◽  
Support Structures ◽  
Offshore Wind Farm ◽  
Actuator Disk

This study evaluated, by time-domain simulations, the fatigue lives of several jacket support structures for 4 MW wind turbines distributed throughout an offshore wind farm off Taiwan’s west coast. An in-house RANS-based wind farm analysis tool, WiFa3D, has been developed to determine the effects of the wind turbine wake behaviour on the flow fields through wind farm clusters. To reduce computational cost, WiFa3D employs actuator disk models to simulate the body forces imposed on the flow field by the target wind turbines, where the actuator disk is defined by the swept region of the rotor in space, and a body force distribution representing the aerodynamic characteristics of the rotor is assigned within this virtual disk. Simulations were performed for a range of environmental conditions, which were then combined with preliminary site survey metocean data to produce a long-term statistical environment. The short-term environmental loads on the wind turbine rotors were calculated by an unsteady blade element momentum (BEM) model of the target 4 MW wind turbines. The fatigue assessment of the jacket support structure was then conducted by applying the Rainflow Counting scheme on the hot spot stresses variations, as read-out from Finite Element results, and by employing appropriate SN curves. The fatigue lives of several wind turbine support structures taken at various locations in the wind farm showed significant variations with the preliminary design condition that assumed a single wind turbine without wake disturbance from other units.

scholarly journals Study of the Bearing Capacity of Stiffened Tall Offshore Wind Turbine Towers during the Erection Phase

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5102
Author(s):  
Yu Hu ◽  
Jian Yang ◽  
Charalampos Baniotopoulos
Keyword(s):  
Wind Energy ◽  
Bearing Capacity ◽  
Wind Turbine ◽  
Structural Response ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Nonlinear Buckling ◽  
Wind Turbine Towers ◽  
Nonlinear Buckling Analysis

Offshore wind energy is a rapidly maturing renewable energy technology that is poised to play an important role in future energy systems. The respective advances refer among others to the monopile foundation that is frequently used to support wind turbines in the marine environment. In the present research paper, the structural response of tall wind energy converters with various stiffening schemes is studied during the erection phase as the latter are manufactured in modules that are assembled in situ. Rings, vertical stiffeners, T-shaped stiffeners and orthogonal stiffeners are considered efficient stiffening schemes to strengthen the tower structures. The loading bearing capacity of offshore monopile wind turbine towers with the four types of stiffeners were modeled numerically by means of finite elements. Applying a nonlinear buckling analysis, the ultimate bearing capacity of wind turbine towers with four standard stiffening schemes were compared in order to obtain the optimum stiffening option.

State-of-the-art design processes for offshore wind turbine support structures

Stahlbau ◽  
2016 ◽  
Vol 85 (9) ◽  
pp. 583-590 ◽  
Author(s):  
Marc Seidel ◽  
Sven Voormeeren ◽  
Jan-Bart van der Steen
Keyword(s):  
Wind Turbine ◽  
State Of The Art ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structures ◽  
Design Processes ◽  
Art Design
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