基于反作用发动机推力的空天飞行器再入姿态飞行控制

研究了空天飞行器(ASV)再入跨大气层飞行时的姿态控制问题。在ASV跨大气层再入飞行时,通过反作用控制系统(RCS)中的反作用发动机推力产生控制力矩来控制ASV的姿态,以补偿气动舵面操纵失效或者部分失效而引起的控制力矩不足;随着空气密度的增加,气动舵面逐步介入控制系统,RCS随之逐步退出.由于快回路控制器产生进行姿态控制所需要的控制力矩,其通过相应的控制分配将控制力矩映射到作动器,为了减轻作动器的抖振,提出了利用基于区域模型的T-S模糊多模型控制方法设计快回路控制器,在跟踪期望角速度的同时,柔化控制信号.最后通过仿真验证了所提方法的有效性.

Flight control for an aerospace vehicle's reentry attitude based on thrust of reaction jets

The problems concerning an aerospace vehicle's(ASV) atmospheric reentry flight attitude control system were researched.During reentry through the atmosphere,the control moment is generated by thrusters of the reaction control system(RCS) to control attitudes of the ASV,and to compensate for the shortage of aero-surfaces that fail to offer enough moment because of the partially or completely lost efficiency.Along with the increase in air density,aero-surfaces gradually intervene the control system,and the RCS drops out of use.Because the control torque is determined by the fast loop controller and the torque is assigned to actuators by the control allocation algorithms,a multi-model switching control method based on T-S fuzzy control is proposed and is employed to design the controller for the fast-loop such that the required virtual control input is tracked and the actuators' chattering is reduced.Therefore,the control input is softened.The effectiveness of the proposed method is demonstrated by the simulation results.