Multi-physics Dynamic Response Analysis of Large Monopile Wind Turbine under Scouring Effect
In order to study the influence of scour and wind-wave-earthquake load on the dynamic re-sponse of large offshore wind turbine,a finite element model of monopile support structure considering soil-structure coupling effect was established to analyze the time domain of wind turbine.The results show that the scour has a greater impact on the high-order mode of the wind turbine;when only the wind-wave load is excited,with the increase of scour depth,the whole time history curve of wind turbine tower and pile foundation moves up continuously,the displacement increases significantly,and the main movements of both tower and pile foundation appear in the direction of turbulent wind flow;under the combined exci-tation of wind-wave-earthquake load,the dynamic responses of tower and pile foundation are different.When the scour depth is small,the displacement of wind turbine tower increases gradually,but with the increase of scour depth,the displacement of tower decreases gradually,and the displacement of pile foundation decreases with the increase of scour depth;under the action of wind-wave-earthquake load,the displacement of tower and pile foundation in different scour depths increases compared with that under wind-wave load.
offshore wind turbinefoundation scourearthquakesoil-structure couplingmultiphysics field
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