基于干扰观测器的变后掠翼近空间飞行器鲁棒跟踪控制

Robust tracking control of variable swept-wing near space vehicle based on disturbance observers

针对变后掠翼飞行器具有多工作模式、大飞行包络的特性,本文建立了非线性多模型切换系统,并研究了机翼后掠角变化过程中对飞行高度和飞行速度的跟踪控制.为了减小姿态系统中不确定性和外部未知扰动的影响,利用非线性干扰观测器对复合干扰进行逼近并设计滑模姿态控制器,保证了良好的姿态跟踪控制效果.采用平均驻留时间方法证明了所设计的控制器能够保证切换系统的稳定性.最后,通过仿真对所提方法的有效性进行了验证.

In this study, we establish a nonlinear multi-model switching system for variable swept-wing aircraft based on the characteristics of multiple working modes and the large flight envelope. The tracking control of the flight altitude and speed during backswept varying process is studied. To reduce the uncertainty and external unknown disturbance in the attitude system, a nonlinear disturbance observer is proposed to estimate the complex disturbance. Moreover, a sliding mode attitude controller is designed to maintain a good attitude tracking performance. The average dwell time method is employed to prove that the designed controller offers switching system st ability. Finally, simulation results are presented to confirm the effectiveness of the proposed method.