Study On Dynamic Response Of Offshore Wind Turbine's Blade Under Ice Induced Vibration In Bohai Sea

With abundant wind resources,favorable power grid,and enormous electricity demand,the Bohai Sea has become the core of the wind power industry of offshore wind power,the Bohai Sea has become a region of strategic value for the wind power industry.However,the sea ice of the Bohai Sea in winter is a great challenge for offshore wind turbine.How to overcome the threat of sea ice and guarantee the wind turbines to keep safe,efficient,and durable has become the key issues of wind power industry in Bohai Sea.Based on that background,numerical simulation was employed to analyze the response of jacket offshore wind turbine under ice induce vibration.Structural characteristics of different parts of the structure,non-linear characteristics of pile-soil interaction,and dynamic characteristics of rotor-nacelle assembly were accurately simulated.Calculation cases were set up according to the reasonable site conditions of sea ice.Time histories of ice loads were obtained through dynamic ice load function and transient dynamic analysis were subsequently carried out.The results show that different parts of offshore wind turbine have disparate characteristics of dynamic response.Blade structure is sensible to high frequency energy,and high-frequency response is easy to be excited from low-frequency input.Displacement response of blade under ice-induced vibration may cause the deformation of rotor plane,and velocity response of that will affect local wind speed.The variation of aerodynamic field against ice condition is discussed by analyzing the vibration response of blade under ice-induced vibration.