摘要
高空风场偏差建模方法对运载火箭气动载荷计算和总体性能优化具有显著影响。目前工程常用方法未考虑不同高度层风速相关性,所得样本与实际风场特征存在差异,难以精确预示火箭气动载荷。提出将U/V风速分量建模为关于高度的非平稳高斯过程,基于大量历史风场样本统计分析实际风场在不同高度层的特征参数,利用扩展最优线性估计方法生成与实际风场具有相同分布的子样。结果表明提出的方法相比传统手段能够从形态上更加准确表征真实风场剖面。基于真实飞行器仿真程序对风致载荷进行计算,结果显示该方法对气动载荷裕度的预示误差远小于目前工程方法,对提升火箭运载效率和放行概率具有重要意义。
Modelling methods of the high-altitude wind uncertainty have significant influence on aerodynamic loads and the overall performance optimization of launch vehicles.The commonly used methods in engineering do not consider the correlation between wind speeds at different altitudes,and the simulated wind samples are inconsistent with actual wind characteristics,therefore disable to accurately predict the aerodynamic loads.A modelling method using U/V wind speed components as non-stationary Gaussian processes about the height is proposed.The statistical distribution parameters of massive actual historical wind samples are analyzed,and the expansion optimal linear estimation(EOLE)method is adopted to generate wind samples with the same distribution as actual wind samples.Results indicate that the proposed method can simulate the actual wind profile more precisely than traditional methods.The simulation program of real launch vehicle is used to calculate the wind loads,and the results show that the wind loads predicted by the proposed method is far more accurate than traditional methods,which is of great significance to improve the launch efficiency and launch probability of launch vehicles.
作者
张云伟
张博戎
李静琳
赵小平
赵永志
ZHANG Yunwei;ZHANG Borong;LI Jinglin;ZHAO Xiaoping;ZHAO Yongzhi(Beijing Institute of Astronautical Systems Engineering,Beijing,100076;Xichang Satellite Launch Center,Xichang,615000)
关键词
高空风
偏差建模
高斯过程
运载火箭
风载荷
high-altitude wind
uncertainty modelling
Gaussian process
launch vehicle
wind load
