摘要
针对高超声速飞行器含有未知气动参数和外部扰动的控制问题,设计了一种带有自适应参数近似的块控反步飞行控制器,并通过鲁棒项函数解决逼近误差的影响问题;论文将所选对象扩展为控制矩阵中含有待估计参数矩阵,讨论了块控反步控制器设计的假设条件,同时放宽了对指令信号和输入矩阵的部分限制;应用自适应反步控制技术,通过在反步法中引入指令滤波器,使得伪控制量的导数可以轻易获得,简化了设计。利用Lyapunov函数保证闭环系统有界且跟踪误差指数收敛于原点附近的一个小邻域;通过在六自由度模型上的仿真对比试验,表明了所提方法具有良好的指令跟踪能力和抗干扰能力。
A flight controller using adaptive parameter approximation block backstepping is designed for a hypersonic aircraft with un- known aerodynamic parameters and external disturbances, and the robust term is designed to solve the problem about approach error. The object is expanded to a nonlinear dynamics system including the unknown parameter matrix in control matrix. The assumptions for the con- troller design are analyzed, moreover, some less stringent assumptions about commands and input matrixes are given. By introducing a com- mand filter to adaptive back--stepping control, the derivatives of virtual control are easy to obtain that greatly facilitates control design. The closed--loop system is guaranteed to be bounded and the tracking errors are also guaranteed to be converged exponentially to a small neigh- horhood at zero through Lyapunov stability theorem. Finally, the results are verified by simulation for a 6 DOF hypersonic aircraft. Simula- tion studies illustrate good tracking performance and robustness of the proposed approach.
出处
《计算机测量与控制》
北大核心
2013年第3期681-684,共4页
Computer Measurement &Control
基金
装备技术基础项目(EP114054)
