scholarly journals Scenario analysis for techno-economic model development of U.S. offshore wind support structures

Wind Energy ◽  
2016 ◽  
Vol 20 (4) ◽  
pp. 731-747 ◽  
Author(s):  
R. Damiani ◽  
A. Ning ◽  
B. Maples ◽  
A. Smith ◽  
K. Dykes
Keyword(s):  
Scenario Analysis ◽  
Economic Model ◽  
Model Development ◽  
Offshore Wind ◽  
Support Structures ◽  
Wind Support

Bolted ring flanges in offshore-wind support structures - in-situ validation of load-transfer behaviour

2021 ◽  
Vol 176 ◽  
pp. 106361
Author(s):  
Wout Weijtjens ◽  
Andre Stang ◽  
Christof Devriendt ◽  
Peter Schaumann
Keyword(s):  
Load Transfer ◽  
Offshore Wind ◽  
Support Structures ◽  
Wind Support

Soil–Structure Interaction Effects in Offshore Wind Support Structures Under Seismic Loading

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Fani M. Gelagoti ◽  
Rallis S. Kourkoulis ◽  
Irene A. Georgiou ◽  
Spyros A. Karamanos
Keyword(s):  
Soil Structure ◽  
Nonlinear Response ◽  
Large Diameter ◽  
Seismic Loading ◽  
Offshore Wind ◽  
Wind Loading ◽  
Simultaneous Action ◽  
Offshore Wind Turbine ◽  
Support Structures ◽  
Wind Support

This paper explores the performance of a 10 MW offshore wind turbine (OWT) supported either on a large diameter monopile or a 4-legged jacket emphasizing on the nonlinear response of its belowseabed foundation. The seabed foundation alternatives, a monopile and a multipod foundation, are compared under monotonic, cyclic, and seismic loading. For all nonseismic scenarios considered, the monopile is more flexible than the jacket and transmits higher rotations at the OWT base. The differences between the two alternatives are amplified in the case of nonsymmetric cyclic loading; the monopile not only deforms more than the jacket but tends to accumulate irrecoverable rotation with increasing loading cycles. The seismic performance of the alternative support structures is assessed for a comprehensive set of earthquake motions. It is concluded that both systems are seismically robust especially when subjected to pure earthquake loading, neglecting the simultaneous action of wind and waves. Alarming issues for OWT performance may arise when a nonzero steady wind force is superimposed to the kinematically induced stressing of the seabed foundation due to the seismic wave action. Jacket legs settle unevenly, while monopiles are building up rotations at increasing rates. Assuming a design-level earthquake and a wind thrust of the order 60% of the NC wind loading amplitude, this seismically induced residual rotation for the monopile may often exceed the deformation tolerance criterion. For the same loading combination, the corresponding rotation of the Jacket installation remains safely within the prescribed limits.

scholarly journals Decoupled Modelling Approaches for Environmental Interactions with Monopile-Based Offshore Wind Support Structures

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5195
Author(s):  
Pim van der Male ◽  
Marco Vergassola ◽  
Karel van Dalen
Keyword(s):  
Offshore Wind ◽  
Design Stage ◽  
Computational Time ◽  
Engineering Practice ◽  
Preliminary Design ◽  
Support Structures ◽  
Environmental Interactions ◽  
Preliminary Design Stage ◽  
Wind Support ◽  
Modelling Approaches

To meet the political goals regarding renewable energy production, offshore wind keeps expanding to waters with larger depths and harsher conditions, while the turbine size continues to grow and ever-larger foundation structures are required. This development can only be successful if further cuts in the levelized cost of energy are established. Regarding the design of the foundation structures, a particular challenge in this respect relates to the reduction of the total computational time required for the design. For both practical and commercial reasons, the decoupled modelling of offshore wind support structures finds a common application, especially during the preliminary design stage. This modelling approach aims at capturing the relevant characteristics of the different environment-structure interactions, while reducing the complexity as much as possible. This paper presents a comprehensive review of the state-of-the-art modelling approaches of environmental interactions with offshore wind support structures. In this respect, the primary focus is on the monopile foundation, as this concept is expected to remain the prominent solution in the years to come. Current challenges in the field are identified, considering as well the engineering practice and the insights obtained from code comparison studies and experimental validations. It is concluded that the decoupled analysis provides valuable modelling perspectives, in particular for the preliminary design stage. In the further development of the different modelling strategies, however, the trade-off with computational costs should always be kept in mind.

scholarly journals The effect of failure criteria on risk-based inspection planning of offshore wind support structures

2021 ◽  
pp. 146-153
Author(s):  
N. Hlaing ◽  
P.G. Morato ◽  
P. Rigo ◽  
P. Amirafshari ◽  
A. Kolios ◽  
...  
Keyword(s):  
Failure Criteria ◽  
Offshore Wind ◽  
Support Structures ◽  
Inspection Planning ◽  
Wind Support

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.

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