复杂约束条件下高超声速飞行器再入轨迹优化

Reentry Tracking Control of Hypersonic Vehicle with Complicated Constraints

针对飞行器材料的物理性质和战略应用实际,设定热流、过载、动压和禁飞区等约束条件,构建了非线性多耦合最优控制问题模型。利用自适应伪谱法进行模型转换,经过网格细化配点优化过程,使状态变化量较大的时间区间被进一步细分,降低了系统误差的同时将初始最优控制问题转变成非线性规划问题。提出了最大轨迹空间使得优化轨迹满足复杂约束,并使用SNOPT求解器解算出符合条件的最优轨迹。仿真结果表明,再入轨迹可以满足约束条件,在避开禁飞区的同时取得最优指标。

Based on the physical properties of aircraft materials and the practical application of strategy,the constraints of heat flow,overload,dynamic pressure and no-fly zone were set up to form the nonlinear multi-coupling optimal control problem.The adaptive pseudo-spectral method was used to transform the model,and the time interval with large state variations was further subdivided by the mesh refinement and point assignment optimization process,which reduces the system error and transforms the initial optimal control problem into a nonlinear programming problem.The maximum trajectory space was proposed to make the optimal trajectory satisfy complex constraints,and the optimal trajectory was solved by using SNOPT solver.The simulation results show that the reentry trajectory can satisfy the constraints and obtain the optimal index while avoiding the no-fly zone.