基于干扰观测器的高超声速飞行器Terminal滑模控制

Terminal Sliding Mode Controller with Nonlinear Disturbance Observer for Flexible Hypersonic Vehicle

针对高超声速飞行器控制系统纵向平面轨迹跟踪问题,提出了一种基于干扰观测器的终端(Terminal)滑模控制器设计方法。将结构的弹性振动视为刚体动力学系统中的不确定因素,采用Terminal滑模控制方法设计速度和高度控制器。为增强控制器的鲁棒性,设计了一种非线性干扰观测器对模型不确定项进行自适应估计和补偿。仿真实验表明,该控制器对模型不确定性和气动弹性影响具有鲁棒性,能够实现对速度和高度参考输入的稳定跟踪。

A terminal sliding mode controller is designed for longitudinal motion of flexible hyperson- ic vehicles. The longitudinal motion model is presented by taking flexible effect of the vehicle structure as disturbance. Based on terminal sliding mode control, velocity and altitude controllers are designed. In order to enhance the controllers＇ robustness, a new nonlinear disturbance observer is introduced to estimate and compensate the model uncertainties. Reference trajectory tracking simulation shows the effectiveness of this controller in tracking velocity and altitude commands in the presence of model uncertainty and aeroelasticity.