高超声速再入滑翔飞行器的模糊变结构控制

Fuzzy Sliding Mode Control for Hypersonic Re-entry Vehicles

针对高超声速再入滑翔飞行器的再入姿态控制,设计了模糊变结构姿态控制器.根据控制系统的任务,建立了面向控制的模型.将模糊控制与滑模变结构控制的思想相融合,研究了模糊滑模变结构控制器的设计方法.通过在稳定的误差相平面内构造稳定的滑模面,模糊控制器根据误差状态与滑模面的相对位置输出控制信号,使得系统的轨迹能趋近稳定的滑模面,从而使得误差沿着滑模面收敛到原点.将模糊滑模变结构控制方法应用于高超声速滑翔洲际飞行器,给出了再入滑翔姿态控制器的设计方案,分别对攻角、侧滑角和倾侧角设计了独立的模糊变结构控制器,提出了分段线性控制分配方法.在Matlab中进行了整个控制系统的仿真测试,验证了该方法的可行性.

This paper developed a fuzzy sliding mode controller for the attitude control of hypersonic re-entry vehicles.First,the control-oriented model of vehicles is given.Then,by combining fuzzy control theory and sliding mode control technique,a fuzzy sliding mode control method is proposed.The design of fuzzy sliding mode controller is based on a pre-designed sliding surface in the stable error phase plane.The output of the fuzzy controller is accordingly adjusted with respect to the distances between the error state and the sliding surface,which could force the system state to reach the sliding surface,in turn lead error to converge to the origin along it.Furthermore,this control design method is applied to the attitude control problem of hypersonic re-entry vehicles.Three independent fuzzy sliding mode controllers are designed for the control of angle of attack,sideslip and bank.In addition,a practical piecewise linear control allocation scheme is introduced.Finally,the simulation results show that the proposed method is feasible.