基于滑模观测器和干扰观测器的弹性高超声速飞行器控制

Longitudinal Control of Flexible Hypersonic Vehicle Based on Sliding Mode Observer and Disturbance Observer

研究了基于滑模观测器和干扰观测器的弹性高超声速飞行器纵向通道控制。首先,利用可测飞行高度、俯仰角速率估计误差设计滑模观测器,重构未知攻角、航迹角;其次,设计干扰观测器估计包含弹性耦合和阵风等外部干扰的集总扰动;再次,将高超声速飞行器纵向通道模型分为速度、高度2个功能子系统,采用基于反步法的动态逆方法,避免系统复杂度爆炸问题,设计舵面偏角和燃油当量实现对期望高度和速度信号的有效跟踪;最后,通过仿真测试验证该方法的有效性。

The longitudinal control of flexible hypersonic vehicle based on sliding mode observer and disturbance observer is proposed.The sliding mode observer was designed to reconstruct the unmeasured attack angle and flight path angle.The disturbance observer was utilized to estimate the lumped disturbances including the influence of elastic mode and the ex⁃ternal disturbances such as winds.Using the estimation results,the back-stepping-based dynamic surface control was em⁃ployed to avoid the explosion of complexity caused by continuous integration,and to control the altitude subsystem and ve⁃locity subsystem.Simulation results show that under the wind effects,the unmeasured attack angle and the unmeasured flight path angle,desired tracking accuracy is obtained.