高超声速飞行器再入自适应容错制导控制一体化设计

针对故障下高超声速飞行器安全再入飞行问题,考虑控制系统存在各种不确定性参数、干扰和力矩故障,进行高超声速飞行器再入自适应容错制导控制一体化(Integrated guidance and control,IGC)设计。首先,针对分离通道的制导与控制(Separate channel integrated guidance and control,SCIGC)模型设计无法同时协调制导和控制系统容错能力的问题,考虑制导环和姿态环之间关系并建立制导控制一体化模型;然后,针对一体化模型设计自适应滑模Backstepping容错控制器,并采用Takagi-Sugeno(T-S)模糊模型在线逼近由未知参数和加性故障引起的复合干扰项;最后,基于Lyapunov稳定性定理设计参数自适应律在线更新容错控制器,同时引入投影算子防止参数漂移以保证参数处于合理区间,从而完成自适应容错制导控制一体化方案设计。在飞行器故障条件下,通过IGC与SCIGC控制策略的仿真对比,验证了自适应容错IGC控制策略的有效性和优越性。

Integrated Design of Reentry Adaptive Fault-Tolerance Guidance and Control for Hypersonic Vehicle

For the safe reentry flight of hypersonic vehicle under faults, considering the existence of various uncertain parameters and torque faults in the control system, we propose the integrated design of the hypersonic vehicle reentry adaptive fault-tolerance guidance and control. First, owing to the design of separate channel integrated guidance and control(SCIGC) cannot coordinate the fault-tolerance of the guidance and control system simultaneously, the coupling relationship between the guidance and the attitude is considered, and an integrated and coupling model of guidance and control is established. Then, for the integrated coupling model, an adaptive fault-tolerance integrated guidance and control (IGC) is designed. An adaptive dual-loop sliding mode fault-tolerance controller is designed, and a Takagi-Sugeno(TS) fuzzy model is used to approach the complex disturbances caused by unknown parameters and additive faults. Finally, the adaptive parameters in the controller are designed based on the Lyapunov stability theorem. At the same time, the projection operator is introduced to ensure the bound of the parameters, and the design parameter adaptation law is used to update the fault-tolerance controller online, so as to complete the design of the integrated program of adaptive fault-tolerance guidance and control. Under the fault conditions, the effectiveness of the adaptive fault-tolerant IGC is verified through the simulation comparison between IGC and SCIGC.