弹性高超声速飞行器输入饱和抑制backstepping控制

Saturation restraint of inputs backstepping control for a flexible hypersonic vehicle

针对一类无鸭翼弹性吸气式高超声速飞行器纵向短周期系统姿态跟踪控制问题,提出一种基于backstepping的输入饱和抑制非线性控制方法。考虑升降舵偏转量对升力的影响,引入新的虚拟控制量精准控制攻角状态。将机体的弹性模态影响视作一类干扰项,设计非线性干扰观测器对其进行估计,并在控制器中予以补偿。引入非线性增益函数提高系统控制输入量的饱和抑制能力,并基于李雅普诺夫理论证明了闭环系统的稳定性。仿真分析验证了所提出方法的有效性。

According to the attitude tracking control problem of a flexible air-breathing hypersonic vehicle,a nonlinear control method with saturation restraint of inputs based on backstepping was proposed.Considering the influence of the deflection of the elevator on the lift,a new virtual control variable was introduced to control the state of angle of attack precisely.The effects brought by the elastic modes of the body were considered as a class of disturbance,which was estimated via the disturbance observer and compensated within the controller.A nonlinear gain function was introduced to improve the saturation restraint capability of the control input of the system,and the stability of the close-loop system was proved based on the Lyaponuv theory.The simulation analysis demonstrated the validity of the proposed method.