环境参数对风电齿轮箱传动系统疲劳损伤的影响

Effects of environmental parameters on fatigue damage of wind turbine gearbox transmission system

在风电机组全寿命周期内,长期风速概率分布会使风电齿轮箱传动系统动载荷出现随机特性,影响其疲劳损伤预估精度。笔者提出了一种考虑长期风速概率分布特征的风电齿轮箱传动系统疲劳损伤预估方法,通过建立大功率海上风电机组OpenFAST-SIMPACK联合仿真模型,计算不同平均风速与湍流强度组合工况下的风电齿轮箱传动系统齿轮短期疲劳损伤,进而采用代理模型技术重构“平均风速、湍流强度-短期疲劳损伤”映射关系,预测齿轮长期疲劳损伤。研究结果表明:风电齿轮箱传动系统低速级太阳轮容易发生接触疲劳失效;在额定风速以下,低速级太阳轮短期疲劳损伤与平均风速呈正相关,在额定风速附近,平均风速与湍流强度的随机特性均会增大其长期疲劳损伤不确定性,增大其疲劳失效风险。

In the entire life cycle of a wind turbine,the probability distribution of long-term wind speeds introduces randomness to the dynamic load on the wind turbine gearbox transmission system appear random,thereby affecting the accuracy of fatigue damage prediction.In this paper,a fatigue damage prediction method is proposed for the wind turbine gearbox transmission system with considering the characteristics of the long-term wind speed probability distribution.The approach involves assessing the short-term fatigue damage of gears in the transmission system of wind turbine gearbox based on an OpenFAST-SIMPACK combined simulation model built for high power offshore wind turbines.Subsequently,surrogate model technology is used to reconstruct the mapping relationship between“average wind speed,turbulence intensity,and short-term fatigue damage”enabling the prediction of long-term fatigue damage for the gears.The research results show that the low-speed sun gear in the wind turbine gearbox transmission system is prone to contact fatigue failure.Below the rated wind speed,the short-term fatigue damage of the low-speed sun gear correlates positively with the average wind speed,thereby increasing the uncertainty of long-term fatigue damage and elevating the risk of fatigue failure.