基于滑模观测器的临近空间飞行器容错控制  

Fault-Tolerant Control of Near Space Vehicles Based on Sliding Mode Observer

作　　者：林常青 李学虎 

机构地区：[1]后勤学院后勤指挥系,北京100858

出　　处：《控制工程》2012年第3期394-398,共5页Control Engineering of China

基　　金：国家自然科学基金资助项目(60874073)

摘　　要：针对临近空间飞行器中结构未知的执行器故障,提出一种基于滑模观测器的容错控制方法。采用Edwards-Spurgeon观测器结构设计滑模观测器,实现对执行器故障的鲁棒估计。根据所得的故障信息设计模型参考滑模容错控制器,控制律的非线性增益分为两部分,保证系统的鲁棒容错性能。一部分利用参数不确定的界值条件设计,一部分基于鲁棒故障估计信息设计。基于李雅普诺夫稳定性理论证明了系统的渐近稳定性。仿真结果表明,该方法能有效实现对执行器故障的鲁棒估计,并保证故障条件下飞行器对参考模型的稳定跟踪性能,达到了期望的容错效果。A fault-tolerant control method based on th$ sliding mode observer is proposed to deal with the unknown structure actuator faults in near space vehicles. The sliding mode observer, where the robust fault estimation can be achieved, is designed based on the Edwards-Spurgeon observer structure. A model reference sliding mode fault-tolerant controller is designed by using the fault information. The nonlinear gains of the control law are separated into two parts to guarantee the robustness fault-tolerant performance of the system. One is designed using the boundary condition of the parameter uncertainty, while the other is designed by the robust fault estimation. The asymptotical stability of the system is proved by Lyapunov stability theorem. Simulation results show that the proposed method makes sure that the system achieves the ability of the robust model-following performance against the actuator faults.

关 键 词：临近空间飞行器 容错控制 模型参考 滑模观测器 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]