不确定条件下采用协方差描述函数法的再入轨迹鲁棒优化

Uncertainties are taken into account in reentry trajectory optimization and a robust trajectory optimization model is constructed based on the robust optimization theory. There are computational difficulties in solving this robust trajectory optimization problem due to the random variables associated with the uncertainties. To overcome these difficulties, the covariance analysis describing function technique (CADET) is employed to convert the robust trajectory optimization model into an equivalent deterministic trajectory optimization formulation, which is then solvable by using the existing pseudo spectral method. In the case study, a robust reentry trajectory optimization problem considering the uncertainties of aerodynamic parameters is solved to obtain the robust optimal trajectories. By comparing with the traditional deterministic optimal trajectories, the robust optimal trajectories are significantly less sensitive to the uncertainties of aerodynamic parameters, showing the effectiveness of the presented method.      

机载导弹安全分离评估方法研究

为高效地判断导弹从载机分离过程的安全性,根据分离过程中导弹和载机的相对运动关系推导了判定载机-导弹分离是否安全的Schoch判据。采用"自由流模型+干扰模型"的气动建模方法,建立起了分离过程中的导弹气动模型。在此基础上,计算得到了分离过程中导弹相对于载机运动的相对速度和相对加速度,将这些参数代入Schoch判据中,进行分离的安全性评估。采用上述方法,对某三角翼载机外挂导弹分离过程进行了分离安全性评估,验证了本方法的可行性。