高超声速飞行器的滑模边界层模糊自适应控制方法研究

Research on an Adaptive Fuzzy Sliding Mode Boundary Layer Control Method for a Hypersonic Vehicle

摘要:

针对高超声速飞行器飞行过程中存在的高度非线性、强耦合、参数不确定性等问题提出了一种基于滑模边界层模糊自适应的控制方法;首先将纵向模型进行精确线性化,通过引入一个滑模边界层可调参数,在边界层外施加基于正切趋近律的准滑模控制律；在边界层内,去掉准滑模控制律,采用饱和函数法设计的控制律;边界层参数用模糊逻辑系统进行在线调节,从而消除了系统处于准滑动模态时的高频抖振;仿真结果表明:该方法在保证控制系统具有良好跟踪性能的同时,具有削弱抖振的能力和强鲁棒性。

Abstract:

Contrary to hypersonic vehicle's high nonlinear, strong coupling, uncertain parameters and other issues existed in its flight process, This paper presents an adaptive control method based on fuzzy sliding mode boundary layer. Firstly, the longitudinal mode is lined exactly, then by introducing an adjustable parameters as sliding boundary layer, quasi-sliding mode control law based on tangent reaching law is applied on the outside of the boundary layer. However, it is replaced by control law designed by the saturated function in the boundary layer. The parameters is adjusted online by fuzzy logical system, so the high-frequency buffeting which is caused by quasi-sliding mode is eliminated. The simulation results demonstrate that the system can not only track the input, but also possess strong robust and eliminated buffeting.