基于滑模的运载器主动段俯仰通道姿控系统设计

Design of Launch Vehicle’s Pitching Channel Attitude Control System Based on SMC

与传统比例-积分-微分(PID)控制方法相比,滑模控制(SMC)方法可以比较容易地将不确定性纳入控制器设计中,从而增强系统的鲁棒性。探索了SMC技术在运载器主动段姿态控制中的工程应用,首先通过分析基于趋近律的SMC系统,提出了降低不连续切换项系数的需求,然后研究了基于干扰上界的SMC方法。三通道小偏差仿真结果验证了两种方法的控制效果,表明第2种控制器的鲁棒性更好,稳态误差小,同时发动机喷管摆角需求较小。

Compared with the classical PID control method,sliding mode control(SMC)method can easily take uncertainties into account.The system’s robustness.The engineering application of SMC technology into launch vehicle’s attitude control during boosting phase is issued is increased.Firstly,SMC system based on reaching law is studied and then depressing the discontinuity switching item is required.Secondly,SMC system based on the upper limit of disturbance is analyzed.The control effect of the two methods is evaluated by three degrees of freedom simulation.It’s proved that the second controller performs well in robustness and precision while the control demand of the motor’s nozzle is smaller.