无动力自动着陆轨道的鲁棒性分析

文中定义了能量梯度的概念,作为评价能量积累和消耗能力的指标。针对跨大气层飞行器对象特性的特点,重点讨论了气动参数的不确定性存在时的着陆点性能、整个下滑轨道容许的气动参数的不确定性范围和对初始动压的抑制能力,结果表明下滑轨道具有较好的鲁棒性。

Robustness Assessing of Unpowered Autolanding Trajectory

The uncertainties in aerodynamics and initial conditions are considered for assessing the robustness of the trajectory. The approach of assessing the robustness is the same algorithms used in designing the original auto landing trajectory, i.e. the method based on the 3 degrees-of-freedom nonlinear equations of motion which governing dynamic pressure. The energy potential is defined as the measure of the ability to increase and decrease energy to remove energy dispersions. The touchdown characters, the allowable uncertainties in aerodynamics and dynamic pressure disturbance rejection are assessed when in the presence of uncertainties in aerodynamics. The result shows that the trajectory is robust.