亚轨道飞行器返回轨迹快速优化

快速、准确、鲁棒的轨迹生成方法可以增加任务的安全性与可靠性,极大地降低成本。针对亚轨道飞行器返回段特点,引入"伪控制量"、"末端进场走廊"等概念,分别采用高斯伪谱法和向前拉道伪谱法进行了返回轨迹快速优化研究,比较了两种伪谱法在处理复杂问题时的能力。仿真结果表明,向前拉道伪谱法不适合处理含控制量约束的问题,而高斯伪谱法在满足各种约束条件下,能够快速准确地生成亚轨道飞行器返回轨迹,同时验证了结果的可行性与最优性。

The Rapid Optimization of Entry Trajectory for Suborbital Launch Vehicle

The rapid,accurate and robust trajectory generation methods can substantially improve safety and reliability while reducing cost.For entry trajectory characteristics of suborbital launch vehicle(SLV),the concepts of "pseudo-control variables" and "final approach corridor(FAC)" are introduced to formulate optimal control problem.The Gauss pseudospectral method and forward Radau pseudospectral method are applied to rapid optimization of entry trajectory for SLV.The abilities of these two pseudospectral methods to handle complex trajectory optimization problems are compared.The results of this study show that the forward Radau pseudospectral method is not suited to deal with problems with control variable constraints,but the Gauss pseudospectral can rapidly and accurately generate SLV entry trajectory with various constraints.The feasibility and optimality are verified through the final results.