基于特征模型的高超声速飞行器鲁棒控制方法

Robust adaptive controller design for a hypersonic vehicle based on characteristic model

针对高超声速飞行器不确定性因素多、参数变化范围大的特点,将特征建模理论与多模型自适应控制方法相结合,设计了一种基于特征模型的鲁棒自适应控制方案。将飞行器的飞行包络划分为若干个子空间,基于对象特征模型分别设计各子空间的H∞鲁棒控制器,飞行过程中,通过在线辨识得到的特征模型参数对各子控制器进行平滑切换。该控制方案不但可以较好地解决高超声速飞行器的模型不确定性问题,而且基于特征模型设计得到的鲁棒控制器阶数较低,易于工程实现。

For hypersonic flight vehicles,various uncertainties in addition to the parameters large-scale variety result in a challenging control model,a new robust adaptive control approach based on characteristic model was proposed to achieve the altitude tracking.First,to divide the flight envelope into numbers of subspaces which overlap one another.Then,to design the H∞ robust controllers based on characteristic model for each subspace.In the course of flight,to switch the output of subcontrollers according to the characteristic model parameters calculated by online parameter estimation.The characteristic model brings low order robust controller which is convenient to implement.And simulation results demonstrate the validity of the proposed control scheme to deal with model uncertainties.