New Suboptimal Control Design for Reentry Phase of Reusable Launch Vehicle
This paper introduces a new suboptimal nonlinear control method called theta-D approximation to design hypersonic aircraft entry longitudinal guidance law. By introducing an intermediate variable theta,the solution to HJB(Hamilton-Jacobi-Bellman)equation can be expanded as a power series in terms of theta, as the result, a set of recursive algebraic equations can substitute for difficult HJB equation, which can be solved online easily. A suboptimal controller applied in this method has been designed, which implement in 3-DOF dynamics. The numerical simulation result of theta-D approximation has compared with the result of traditional LQR method. It is proved that theta - D approximation is an excellent method to solve nonlinear optimal control problem.
Entry Longitudinal Guidance Optimal Control Theta-D Approzimation Nonlinear System
Gao Chen Li Huifeng
Automatic Science and Electrical Engineering School, Beihang University, Beijing 100083 School of Astronautics Beihang University Beijing 100083
国际会议
The 11th International Space Conference of Pacific-basin Societies(第11届环太平洋国际航天会议)
北京
英文
168-173
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）