运载火箭的抗干扰分数阶控制器设计

针对火箭的姿态控制问题,基于自抗扰理论和分数阶控制,提出了一种控制器设计方法。通过设计扩张状态观测器,充分利用惯组平台和速率陀螺的复合量测信息对系统的内部和外部干扰进行估计。设计分数阶控制器对估计的干扰进行实时补偿,实现火箭的姿态控制,通过引入可调参数使得控制器参数调整范围变大,保证控制器具有更好的控制精度。考虑到控制器参数多且难以被确定,采用一种基于遗传算法和粒子群优化的混合算法对参数进行调整;通过仿真验证了所提算法可以获得良好的动态性能、抗扰性和鲁棒性。

Disturbance rejection fractional order controller design for launch vehicle

A novel controller based on active disturbance rejection control and fractional order control is proposed for the attitude control of launch vehicle. An extended state observer is designed to estimate the impact from parametric uncertainties and disturbances by taking full advantage of the information from the gyros and the attitude sensors. A fractional order controller is proposed to realize the attitude control by compensating the disturbances. A variable parameter is brought to expand the tuning range and obtain higher control accuracy. A hybrid algorithm based on genetic algorithm and particle swarm optimization is proposed to tune the parameters of the controller. Simulation results show that the controller exhibits better dynamic performance, higher ability in disturbance rejection and stronger robustness against the disturbances.