液体运载火箭线性自抗扰容错姿态控制方法

Linear Active Disturbance Rejection Fault Tolerant Attitude Control Method for Liquid Launch Vehicle

针对液体运载火箭发动机故障,提出一种线性自抗扰容错姿态控制方法。以PD+校正网络为基线控制器,通过线性扩张状态观测器观测回路中包括故障在内的总和扰动,以补偿控制的形式与基线控制器指令叠加形成最终控制指令;推导了包括线性扩张状态观测器在内的控制回路传递函数,通过频域仿真分析提出了线性扩张状态观测器带宽参数的设计规则;最后通过时域仿真,与PD+校正网络、自适应增广控制方法对比。结果表明:在给定相同发动机故障工况下,线性自抗扰容错控制方法对故障适应能力明显优于其他方法。

Aiming at the failure of the liquid launch vehicle engine,a Linear Active Disturbance Rejection Control(LADRC)method was proposed.The PD+correction network was used as the baseline controller and the total disturbance of the loop including the fault was observed through the Linear Expansion State Observer(LESO).The total disturbance inside was superimposed with the baseline controller command in the form of a compensation control item.The transfer function of the control loop including the linear expansion state observer was deduced,and the design rule of the observer bandwidth parameter was proposed through the frequency domain simulation analysis.In the end,the time domain simulation was conducted and comparisons were made with the PD+Correction Network and the Adaptive Augmented Control Method.The results showed that LADRC was significantly superior to other methods in fault adaptability for the identical failure of liquid launch vehicle engine.