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一类非线性系统的H2容错控制器的设计及其在空间飞行器的应用

DOI: 10.3724/SP.J.1004.2013.00188, PP. 188-196

Keywords: 故障容错控制,神经网络,H2控制,自适应算法

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Abstract:

?针对存在执行器故障的不确定系统,本文研究了一种H2鲁棒容错控制的设计.控制器包括三个功能:1)利用径向基函数(Radialbasisfunction,RBF)神经网络估计得到的近似非线性函数构成闭环控制,抵消系统的非线性特征;2)能实现H2性能指标的最优控制;3)利用滑模控制抑制模型估计误差以提高控制精度,并且控制器具有指定稳定裕度的设计功能.文中提出了用于执行器故障估计的调整规则,故障估计信息用于控制律的设计.基于Lyapunov函数,推导了满足H2最优性能的充分条件:非线性二次矩阵不等式.为了降低计算成本,给出了不等式求解的简化算法,避免了在线求解非线性矩阵不等式.通过一个空间飞行器模型的仿真,验证了本文提出方法的有效性.

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