海上风电筒型基础整机运输过程荷载识别研究

RESEARCH ON LOAD IDENTIFICATION IN TRANSPORTATION PROCESS OF OVERALL BUCKET FOUND OF OFFSHORE WIND TURBINE

根据某3.3 MW海上风电筒型基础整机运输期原型观测数据,首先采用加速度响应探究环境要素对整机振动影响。其次依据应变-荷载原理计算塔筒底部截面弯矩,并统计全程计算弯矩幅值,分析塔筒承受荷载随环境要素变化规律。结果表明:1)波高从0.2 m增加到2.0 m时,加速度均方根增加98%,波高是引起整机耦联振动的主要因素;2)波高小于1.0 m时,塔筒底部识别弯矩在0~10 MN·m范围内波动,占设计弯矩的21.5%,波高增加到1.5 m时,识别弯矩幅值基本在10~25 MN·m范围内波动;3)波高达到2.0 m时,塔筒底部弯矩幅值达32 MN·m,占设计弯矩的68.9%,整机结构仍在安全范围内;4)运输期根据波浪条件预测制定运输方案,整机应在不超过2.0 m波高条件下运输,保证整机结构有富裕的安全空间。

Based on the measurement data of a 3.3 MW offshore wind turbine supported by the wide-shallow bucket foundation,the influence of environmental factors on the structure vibration is firstly explored with acceleration response. Then the bending moment of the bottom section of the tower under different working conditions is calculated using the strain-load relationship. The amplitude of the bending moment in the whole transportation process is investigated and the change rule of the load with environmental factors is analyzed. The results show that,1)When the wave height increases from 0.2 m to 2 m,the root-mean-square values of acceleration increase by 98%. This means that the wave height is the major cause of the coupled vibration for the integral structure during the transportation;2)When the wave height is less than 1.0 m,the identified moment at the tower bottom fluctuates between 0 and10 MN·m,which is 21.5% of the design moment. When the wave height reaches 1.5 m,the identified moment fluctuates between 10and 25 MN·m;3)When the wave height reaches 2 m,the moment is still within the safe range,arriving at 32 MN·m,which is 68.9%of the design moment. 4)During the transportation,the transportation strategy should be made according to wave prediction. The overall bucket foundation transportation should be carried out under the wave height less than 2 m to ensure the safety and stability of the integrated structure.