运载火箭动力故障下的自主救援轨道规划

Autonomous rescue orbit strategy for propulsion system failure of launch vehicle

针对运载火箭上升段出现动力下降故障的问题,提出了一种基于二阶锥规划方法的在线救援轨道规划策略与飞行轨迹重构算法。根据故障大小设置不同的终端条件,规划合适的救援轨道;同时为了方便求解,设计了新的控制量,然后采用逐次凸化、线性化和梯形离散等方法,将原始规划问题转化为序列迭代求解的二阶锥规划问题。仿真结果表明,所提策略及算法能够满足动力系统故障后的在线救援轨道规划和飞行轨迹重构需求。

This paper presents an online rescue strategy and flight trajectory reconstruction algorithm for launch vehicles to ensure safety in case of propulsion system failure during ascending flight. Different terminal conditions are proposed according to the failure types and severity to plan the convenient rescue trajectory. At the same time, a new state variable is introduced to solve problem conveniently. Then, the methods, such as the successive convexification, linearization and trapezoid discretization, are used to transform the original optimization problem into the second-order cone programming problem(SOCP). Simulations results show that the strategy and algorithm proposed in this paper can meet the requirements of online rescue orbit planning and flight trajectory reconstruction in case of propulsion system failure.