高超声速飞行器的模糊分数阶PID控制

Fuzzy Fractional Order PID Control of Hypersonic Vehicle

将模糊控制与分数阶PID控制相结合,构成模糊分数阶PID控制器,应用于飞行器的姿态控制系统。将整个控制系统分为快速、慢速闭环回路,详细分析了引入分数阶参数对系统性能产生的影响。基于此针对双闭环回路分别设计了分数阶PID控制器,分数阶运算具有信息记忆特性等优势,从而可提高系统的控制精度及稳定性;针对高超声速飞行器因气动参数变化导致的不确定问题,引入模糊控制在线调节分数阶PID控制器参数,以提高系统的鲁棒性。仿真结果显示,所提出的控制系统具备较好的动静态性能,对气动参数摄动呈现出较强的鲁棒性。

The fractional-order PID control is combined with the fuzzy control to form the fuzzy fractionalorder PID controller.It is applied to the attitude control system of hypersonic vehicles.The whole control system is divided into fast and slow closed-loop circuits.The influence of fractional order parameters on control performance is analyzed in detail.On the basis of this,fractional order PID controllers are respectively designed for the double closed loops of hypersonic vehicle.Due to taking the advantages of information memory characteristics during the fractional-order operation,the precision and stability of the control system can be improved.In order to deal with the uncertainty caused by the variation of aerodynamic parameters for hypersonic vehicle,the fuzzy control is employed to adjust the parameters of the fractional-order PID controller online.The robustness of the attitude control system is improved.The simulation results show that the proposed control system has better dynamic and static control performance and has strong robustness in the presence of the uncertain aerodynamic parameters.