摘要
飞行器的飞行状态会受到诸多不确定因素的影响。例如飞行时的外部环境参数,制造时的容许公差和加工误差等不确定性变量会使飞行中的姿态控制产生偏差,导致飞行任务失败,甚至引发灾难性的后果。为此,本文提出了一种基于最优混沌多项式展开的不确定性传播分析方法,有效突破了高维不确定性传播分析面临的变量分布任意以及大规模计算等瓶颈问题。本文提出的传播分析方法,统一度量了高维设计变量中的不确定性,量化分析复杂不确定性对马赫数、动压、轴向过载系数及合成攻角等飞行姿态参数的影响,进而为飞行姿控及后续结构优化设计提供有效依据。
The flight status of the aircraft will be affected by many uncertain factors such as external environmental parameters during flight, allowable tolerances during manufacturing, and processing errors. These uncertain variables will cause deviations in attitude control during flight, resulting in flight mission failure, and even catastrophic consequences. Therefore, an uncertainty propagation analysis method based on optimal polynomial chaos expansion is proposed, which can effectively overcome the bottleneck problems arbitrary variable distribution and large-scale computation in high-dimensional uncertainty propagation analysis. Besides, this method uniformly measures the uncertainty in high-dimensional design parameters, and then comprehensively quantifies the influence of complex uncertainties on flight attitude parameters such as Mach number, dynamic pressure, axial overload coefficient and synthetic angle of attack. They can provide an effective basis for flight attitude control and subsequent structural optimization design.
作者
龚生阳
李哲
曹立雄
洪良友
刘杰
GONG Sheng-yang;LI Zhe;CAO Li-xiong;HONG Liang-you;LIU Jie(College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China;State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;Beijing Institute of Structure Environment Engineering,Beijing 100076,China)
出处
《强度与环境》
CSCD
2023年第1期22-30,共9页
Structure & Environment Engineering
基金
基础研究项目
湖南省自然科学基金(2022JJ40058)。
