基于干扰观测器的运载火箭助推段姿态控制

针对刚体运载火箭助推飞行段的姿态控制问题,提出了一种基于干扰观测器的自适应滑模控制方法。首先,根据姿态动力学模型建立了面向姿态控制的通用模型。其次,针对通用模型中参数不确定性和外界干扰,设计了干扰观测器实时观测后补偿到自适应滑模控制器中,并结合Lyapunov稳定性理论分析了控制器的稳定性。最后,对比传统的PD控制器,在模拟大气环境中进行了姿态控制系统仿真。仿真结果表明,该方法与传统控制方法相比,控制精度和鲁棒性显著提高。

Launch Vehicle Attitude Control Based on Disturbance Observerin Boost-phase

Aiming at the attitude control problem of rigid body launch vehicle in boost-phase,an adaptive sliding mode control method based on disturbance observer is proposed.First,a general model for attitude control is established based on the attitude dynamics model.Secondly,in view of the parameter uncertainty and external interference in the general model,a disturbance observer is designed to observe them in real time and compensate them to the adaptive sliding mode controller,and the stability of the controller is analyzed in conjunction with the Lyapunov stability theory.Finally,compared with the traditional PD controller,the attitude control system simulation is carried out in the simulated atmospheric environment.Simulation results show that this method has significantly improved control accuracy and robustness compared with traditional control methods.