再入飞行器的RCS控制系统设计

针对再入飞行器初始再入段的发动机反作用控制系统(RCS)控制精度问题,提出了一种新型发动机控制方法。首先,将飞行器模型分为慢回路和快回路分别进行控制器设计,采用非线性干扰观测器(DOB)来获取不确定项的估计值,并使用反演法及滑模控制方法设计了飞行器的慢回路和快回路控制律;其次,采用线性规划方法来获取最优RCS指令分配方案;在此基础上,对传统PWPF调制器进行改进,提出了积分补偿型PWPF调制器(IPWPF),采用描述函数法证明了该IPWPF的调制稳定性;最后,通过仿真验证了该方法相比于传统的控制方法具有较高的控制精度。

Reaction control system design for reentry vehicle

According to the tracking error of reaction control system (RCS), a new precision control strategy is proposed for the initial reentry phase of reentry vehicle.Firstly, a nonlinear disturbance observer (DOB) is used for observing the model uncertainty and/or external disturbances.Secondly, a sliding mode control system for the fast loop and slow loop is designed by back-stepping style, and obtained the optimal combination of RCS by linear optimization.Besides, a Integral PWPF Modulator (IPWPF) is proposed based on traditional PWPF modulator, and its stability is proved by a describing function.Finally, the simulation indicates a great precision of the method.