基于伪谱方法的可重复使用运载器轨迹设计  

Trajectory Design for Reusable Launch Vehicles Based on Pseudo-spectral Method

作　　者：李永远[1] 时剑波[1] 张雪梅[1] 李洪波[1] 

机构地区：[1]中国运载火箭技术研究院研究发展中心,北京100076

出　　处：《导弹与航天运载技术》2013年第4期5-8,26,共5页Missiles and Space Vehicles

摘　　要：运用Gauss伪谱方法将运载器三自由度再入轨迹优化问题转化为非线性规划问题,选取Gauss节点上的状态量和控制量作为待优化参数,求解同时满足路径约束和终端约束条件下可重复使用运载器(RLV)的总吸热量最小再入轨迹。路径约束包括驻点热流峰值约束、最大动压约束、过载约束以及控制变量约束;终端约束为高度和速度等。选取优化控制变量为迎角和倾斜角。仿真过程表明,Gauss伪谱法对状态猜测值不敏感,算法容易收敛,适用于轨迹优化问题的求解。To obtain the reentry trajectory with minimum total heat absorption and which satisfied with path constraints and terminal constraints for Reusable Launch Vehicles（RLV）,the Gauss Pseudo-spectral Method（GPM） was applied to convert 3 DOF entry trajectory optimization problem to nonlinear programming problem,and state variables and control variables of Gauss node were selected as optimal parameters.The path constraints include the heat flux peak on stagnation point,maximum dynamic pressure,overload and control variables constraints.The terminal constraints include the vehicle＇s height and velocity.The attack angle and inclination angle are chosen as optimal control variables.The simulation results indicate that GPM were not sensitive to guess value of state and arithmetic was easily convergence,which is suitable for solving the problem of trajectory optimization.

关 键 词：GAUSS伪谱法 可重复使用运载器 轨迹设计 轨迹优化 

分 类 号：V412.4[航空宇航科学与技术—航空宇航推进理论与工程]