海上风机单桩基础受船舶撞击的数值研究

Numerical simulation of monopile foundation of an offshore wind turbine subjected to ship impact

目前国内没有海上风机受船舶撞击的相关规范和损伤评估标准,以国内某单桩基础海上风机为例,运用LS-DYNA软件从能量变化、最大撞击力和风机响应角度对风机受船舶撞击过程进了分析,并提出面积受损率来评估风机受损程度。分析结果显示:船舶初始动能在分别不超过约35 MJ、35 MJ、25 MJ时,最大撞击力与船舶质量的1/3次方、速度、撞击角度的正弦值成线性关系,超过时线性关系不再明显;面积受损率能合理反映单桩基础的受损区域和受损面积。

There are no relevant specification and damage assessment criterion of offshore wind turbine subjected to ship impact in our country now.Here,taking a domestic offshore wind turbine with monopile foundation as an example, the process of the offshore wind turbine stricken by a ship was analyzed by using LS-DYNA in perspectives of energy variation,the maximum collision-force and the response of the offshore wind turbine.The area damage rate was proposed to assess the damage level of the offshore wind turbine.Results showed that the maximum collision-force increases linearly with increase in one-third power of ship mass,velocity and sine of ship collision angle if the initial kinetic energy of the ship is no more than about 35 MJ,35 MJ and 25 MJ,respectively;the linear relationship is not obvious other wise;the area damage rate can reasonably reflect the damaged field and its area of the monopile foundation.