基于离散元素法的浮冰撞击风力机塔架破碎特性研究

Research on Breaking Characteristics of Floating Ice Impacting Wind Turbine Tower Based on Discrete Element Method

在高纬度冬季结冰海域进行作业时,风力机塔架面临着不同速度的浮冰荷载撞击,导致结构倒塌和无法挽回的损失。因此,以冰区海上风力机塔架为研究对象,针对浮冰撞击风力机塔架的过程进行研究。采用离散元素法构建浮冰,通过浮冰与海上风力发电机塔架的相互作用来描述平整海冰破碎行为;在仿真软件EDEM中分别模拟不同冰速、冰厚的条件下海上风力机与平整冰相互碰撞的过程,得到相应的风力机塔架受力及破碎情况。仿真结果表明:浮冰速度和浮冰厚度的增长与风力机受力的增长为非线性关系,在相同增长率的情况下,浮冰厚度对风力机的撞击影响效果明显高于浮冰速度。

When operating in the frozen sea area at high latitude in winter,the wind turbine tower is faced with the impact of floating ice load at different speeds,which leads to the collapse of the structure and irreparable loss.Therefore,taking the offshore wind turbine tower in ice area as the research object,the process of floating ice impacting wind turbine tower is studied.The discrete element method is used to construct floating ice,and the interaction between floating ice and the tower of offshore wind turbine is used to describe the breaking behavior of flat sea ice.In the simulation software EDEM,the collision process between the offshore wind turbine and the flat ice under different ice speed and ice thickness is simulated respectively,and the corresponding stress and crushing conditions of the wind turbine tower are obtained.The simulation results show that the relationship between the increase of floating ice velocity and floating ice thickness and the increase of wind turbine force is nonlinear,and for the same growth rate of wind turbine,the effect of floating ice thickness on wind turbine impact is significantly higher than that of floating ice velocity.