摘要
对2种计算升力式再入飞行器可达区域的方法进行了分析和探讨。首先建立了飞行器三自由度运动方程模型和升力式飞行器基于准平衡假设下的简化模型;然后基于最优控制方法,考虑过程约束和终端约束推导了闭环倾侧角控制律,采用双参数搜索法求取不同纵程下的最大横程;最后,以一种升力式飞行器为例分别用优化方法和常值倾侧角法进行仿真分析,结果表明常值倾侧角法可以代替优化方法进行分析与设计。
The two algorithms for generating landing footprint for lifting reentry vehicles are analyzed and discussed in this paper. Firstly, the three-degree-of-freedom motion equations of an entry vehicle and the simplified model of lifting reentry vehicles based on quasi-equilibrium hypothesis are built. Then, a closed- loop control law for bank angle is deduced, which is based on the optimal control theory by considering process constraints and terminal constraints. A searching method with double parameters is used to find the maximum cross range of different downranges. Finally, it is validated by a kind of lifting vehicle with the method of optimization and constant bank angle. The simulation results indicate that the optimal method can be replaced by const-bank-angle method in the analysis and design.
出处
《航天控制》
CSCD
北大核心
2015年第2期39-43,共5页
Aerospace Control
关键词
升力式飞行器
可达区域
准平衡滑翔
最优控制
常值倾侧角
Lifting vehicles
Landing footprint
Quasi-equilibrium slide
Optimal control
Constant bankangle
