高超音速飞行器的模糊滑模变结构控制

Fuzzy Sliding Mode Control for Hypersonic Vehicles

针对高超声速飞行器具有强耦合、快时变和高度非线性的特点,本研究采用反馈线性化方法,对高超声速飞行器的纵向模型进行输入/输出精确线性化,实现了控制量的解耦。然后基于线性化后的纵向模型,设计了一种模糊滑模控制器,先采用基于动态逆控制的滑模变结构控制器,对模型已知的部分进行精确控制;采用基于模糊函数逼近器,针对模型的不确定性进行自适应补偿控制。最后对某高超声速飞行器的纵向飞行控制进行仿真。结果表明,线性化模型在仿真层面上是正确的,控制方法在仿真层面上是有效性的。

As the hypersonic vehicle is a strong coupling,time-varying and highly nonlinear system,this paper realizes the input /output exact linearization by adopting the feedback linearization method for the longitudinal model of hypersonic vehicle,which makes the controlled variables decoupling. Moreover,a fuzzy sliding mode controller is designed for linearized model,and then achieves precise control by employing sliding mode variable structure controller with dynamic inversion control; and adaptive compensation control is carried out for uncertainty of model by fuzzy function approximation. Finally,numerical simulations considering the vertical flight control of the hypersonic vehicle are studied,and the results show that the linearized model is correct and the control method proposed in this paper is feasible.