论文部分内容阅读
针对多变量、不稳定的近空间飞行器姿态系统,在系统存在参数不确定和外部干扰的情况下,并考虑执行器动态和输入受限,提出一种鲁棒可重构跟踪控制策略.首先,利用二阶滑模干扰观测器分别重构姿态、角速率回路的复合干扰;其次,采用鲁棒二阶滑模积分滤波器的反推(backstepping)方法避免了控制器设计中微分项膨胀问题,利用鲁棒项抵消重构误差对系统的影响,以实现姿态控制器设计.然后,在考虑执行器动态、输入受限及舵面卡死故障下,给出一种线性矩阵不等式的在线优化舵面分配算法,以实现飞行器的姿态角渐近跟踪期望的制导指令.最后,仿真结果表明所提出的方法具有良好的跟踪控制性能.
For the multivariable and unstable near-space vehicle attitude system, a robust reconfigurable tracking control strategy is proposed in the presence of uncertainties and external disturbances in the system, and considering the actuator dynamics and input constraints.Firstly, The second-order sliding mode interference observer is used to reconstruct the composite interference of the attitude and angular rate loop respectively. Secondly, the backstepping method of the robust second-order sliding mode filter is used to avoid the differential term expansion in controller design. Then the robust controller is used to counteract the influence of reconfiguration error on the system to realize the design of attitude controller. Then, an online optimization rudder with linear matrix inequalities (LMIs) is given considering the actuator dynamics, input constraints, Surface assignment algorithm to realize asymptotic tracking of the desired guidance order of the attitude of the aircraft.Finally, the simulation results show that the proposed method has good tracking control performance.