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针对变后掠翼近空间飞行器大包络、多工作模态和模型不确定的特点,研究其模态切换过程中姿态的鲁棒跟踪控制问题.首先建立含扰动项的飞行器非线性切换模型,基于反步滑模方法和非线性干扰观测器设计鲁棒控制器,通过公共Lyapunov函数理论证明所设计的控制律能够保证闭环切换系统的稳定性;采用变增益切换控制策略为不同飞行模态设计合适的控制增益,用以提高系统的动态性能.仿真结果验证了所提出方法的有效性和必要性.
Aiming at the large envelope, multi-working mode and uncertain model of the near-swept-wing near-space vehicle, this paper studies the robust tracking control of the attitude during the process of modal switching.Firstly, a nonlinear handoff model with disturbances is established, Based on the backstepping sliding mode method and the nonlinear disturbance observer, a robust controller is designed. The control law of the proposed Lyapunov function is proved to guarantee the stability of the closed-loop switched system by using the common Lyapunov function theory. Variable gain switching control strategy is used to design the robust controller for different flight modes The appropriate control gain is used to improve the dynamic performance of the system.The simulation results verify the effectiveness and necessity of the proposed method.