摘要
为保证大型浮式风力机在极端工况下的正常运行与结构安全,有必要开展极端工况下大型浮式风力机结构响应的极值预报以及结构安全性评估。该文采用OpenFast软件对中国南海50 a一遇的工况下15 MW半潜式风力机进行结构响应数值模拟,利用平均穿越率法并结合泊松近似假设,对大型浮式风力机塔基剪力和弯矩的极值分布进行预报。结果显示,极端工况下,浮式风力机在纵摇固有频率附近,由于纵摇运动引起气动载荷变化,导致塔底弯矩和剪力显著增加。同时,平均穿越率法能有效预报15 MW浮式风力机的塔基结构响应极值分布,在超越概率为0.01的情况下,基于1 h数值模拟响应样本预报的塔基剪力和弯矩极值能满足结构强度要求。
To ensure the normal operation and structural safety of large-scale floating wind turbines under extreme sea conditions,extreme value estimation of structural responses is necessary to be carried out to assess the safety of structures.In this work,the OpenFast software was used to perform numerical simulations of the structural response of a 15 MW large-scale floating wind turbine in the South China Sea under a 50-year return period sea state.Combining with the Poisson approximation assumption,the average crossing rate method was employed to estimate the extreme distribution of tower base shear and bending moment for the large-scale floating wind turbine.The results show that under extreme conditions,the tower base shear force and bending moment will be significantly excited near the natural frequency of the tower's pitch motion,leading to a sharp increment of the dynamics responses.Moreover,the average upcrossing method can effectively estimate the extreme value distribution of the tower base structural response for a 15 MW floating wind turbine.Under an exceedance probability of 0.01,the estimated extreme values of tower base shear and bending moment based on 1-hour numerical simulation response samples satisfied the structural strength requirements.
作者
曹林阳
何林
柴威
施伟
张礼贤
曲晓奇
Cao Linyang;He Lin;Chai Wei;Shi Wei;Zhang Lixian;Qu Xiaoqi(Key Laboratory of High Performance Ship Technology,Ministry of Education(Wuhan University of Technology),Wuhan 430063,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;Ocean Engineering Technology Center,China Classification Society,Tianjin 300457,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2024年第9期534-542,共9页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(52071058,52201379)。
关键词
海上风力机
半潜式
可靠性评估
极值预报
平均穿越率法
offshore wind turbines
semisubmersible
reliability analysis
extreme value estimation
average upcrossing rate method
