scholarly journals Dynamic analyses of operating offshore wind turbines including soil-structure interaction

2018 ◽  
Vol 157 ◽  
pp. 42-62 ◽  
Author(s):  
Haoran Zuo ◽  
Kaiming Bi ◽  
Hong Hao
Keyword(s):  
Wind Turbines ◽  
Soil Structure ◽  
Offshore Wind ◽  
Soil Structure Interaction ◽  
Offshore Wind Turbines ◽  
Structure Interaction ◽  
Dynamic Analyses

Numerical Analysis of a Gravity Substructure for 5MW Offshore Wind Turbines due to Soil Conditions

2015 ◽  
Author(s):  
Min-Su Park ◽  
Youn-Ju Jeong ◽  
Young-Jun You ◽  
Du-Ho Lee ◽  
Byeong-Cheol Kim
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Soil Structure ◽  
Offshore Wind ◽  
Soil Structure Interaction ◽  
Structural Safety ◽  
Soil Conditions ◽  
Wave Forces ◽  
Offshore Wind Turbines ◽  
Structure Interaction

In order to increase the gross generation of wind turbines, the size of a tower and a rotor-nacelle becomes larger. In other words, the substructure for offshore wind turbines is strongly influenced by the effect of wave forces as the size of substructure increases. In addition, since a large offshore wind turbine has a heavy dead load, the reaction forces on the substructure become severe, thus very firm foundations should be required. Therefore, the dynamic soil-structure interaction has to be fully considered and the wave acting on substructure accurately calculated. In the present study ANSYS AQWA is used to evaluate the wave forces. The wave forces and wave run up on the substructure are presented for various wave conditions. Moreover, the substructure method is applied to evaluate the effect of soil-structure interaction. Using the wave forces and stiffness and damping matrices obtained from this study, the structural analysis of the gravity substructure is carried out through ANSYS mechanical. The structural behaviors of the strength and deformation are evaluated to investigate an ultimate structural safety and serviceability of gravity substructure for various soil conditions. Also, the modal analysis is carried out to investigate the resonance between the wind turbine and the gravity substructure.

Dynamic soil-structure interaction in offshore wind turbines on monopiles in layered seabed based on real data

2018 ◽  
Vol 156 ◽  
pp. 14-24 ◽  
Author(s):  
Guillermo M. Álamo ◽  
Juan J. Aznárez ◽  
Luis A. Padrón ◽  
Alejandro E. Martínez-Castro ◽  
Rafael Gallego ◽  
...  
Keyword(s):  
Wind Turbines ◽  
Soil Structure ◽  
Real Data ◽  
Offshore Wind ◽  
Soil Structure Interaction ◽  
Offshore Wind Turbines ◽  
Structure Interaction

scholarly journals Evolution of the Seismic Response of Monopile-Supported Offshore Wind Turbines of Increasing Size from 5 to 15 MW including Dynamic Soil-Structure Interaction

2021 ◽  
Vol 9 (11) ◽  
pp. 1285
Author(s):  
Cristina Medina ◽  
Guillermo M. Álamo ◽  
Román Quevedo-Reina
Keyword(s):  
Seismic Response ◽  
Wind Turbines ◽  
Soil Structure ◽  
Offshore Wind ◽  
Soil Structure Interaction ◽  
Rigid Base ◽  
Offshore Wind Turbines ◽  
Structure Interaction ◽  
Shear Wave Velocities ◽  
Inertial Interaction

As a result of wind power’s expansion over the globe, offshore wind turbines (OWTs) are being projected in seismic prone areas. In parallel, the industry develops increasingly larger and more powerful generators. Many of the seismic response analyses of wind turbines conducted so far only consider smaller units. In this paper, a finite element substructuring model in frequency domain is used to compute the seismic response of four reference OWTs from 5 to 15 MW founded on monopiles embedded in several homogeneous soil profiles with shear wave velocities from 100 to 300 m/s and subjected to different accelerograms. The foundation behaviour is obtained through a continuum model including kinematic and inertial interaction. The relevance of soil-structure interaction and main trends of the seismic response of OWTs are inferred from the presented results. Although the seismic maximum bending moments increase with the size of the OWT system, their relevance with respect to the ones produced by design loads decreases as the turbine gets bigger. The same effect is observed for the shear forces if the soil is soft enough. The inclusion of SSI effects almost duplicates the seismic response when compared to the rigid base scenario.

scholarly journals Modelling of soil-structure-interaction for flexible caissons for offshore wind turbines

2019 ◽  
Vol 171 ◽  
pp. 273-285 ◽  
Author(s):  
Kristoffer Skjolden Skau ◽  
Hans Petter Jostad ◽  
Gudmund Eiksund ◽  
Hendrik Sturm
Keyword(s):  
Wind Turbines ◽  
Soil Structure ◽  
Offshore Wind ◽  
Soil Structure Interaction ◽  
Offshore Wind Turbines ◽  
Structure Interaction
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