针对现阶段随机冰力时域模拟方法单一的问题,将一种经典的时域模拟方法——快速傅里叶逆变换(Inverse Fast Fourier Transform,IFFT)法,引入海上风机单桩基础随机冰载荷研究中.结合随机冰力模型,采用MATLAB软件平台编写冰载荷时域模拟程序.基于山东省东营市渤中某海上风电场8.5 MW单桩式风机的结构与尺寸,进行算例分析,考虑入射角度作用,得到随机冰力在单桩基础结构上的实际分布情况,对IFFT法模拟随机冰力的精度和速度进行综合评价.结果表明,IFFT法作为一种计算简单快速、结果精确的时域模拟方法,适用于单桩基础随机冰力的计算,且所编程序可实现输入少量参数,快速高效获得冰力数值与分布的目的,具有实用性和推广性.
Time Domain Simulation of Random Ice Force on Wind Turbine Single Pile Foundation Based on IFFT Method
In response to the problem that the time domain simulation method of random ice force is single at the present stage,a classical time domain simulation method,the Inverse Fast Fourier Transform(IFFT)method,is introduced into the study of random ice load on the monopile foundation of offshore wind turbines.Combining with the random ice force model,the MATLAB software platform is used to write the ice load time domain simulation program.Based on the structure and dimensions of an 8.5 MW monopile wind turbine at an offshore wind farm in Bozhong,an arithmetic analysis is conducted to obtain the actual distribution of random ice forces on the monopile foundation structure by considering the incidence angle,and the accuracy and speed of the IFFT method to simulate random ice forces are evaluated comprehensively.The results show that the IFFT method,as a simple,fast and accurate time-domain simulation method,is suitable for calculating random ice force on the single pile foundation.The program compiled can achieve the purpose of inputting a small number of parameters to obtain the values and distributions of ice force quickly and efficiently,which is practical and generalizable.
monopile foundationrandom ice loadInverse Fast Fourier Transform(IFFT)methodtime domain simulation
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