基于lipschitz非线性滑模观测器的卫星故障检测  

Fault Detection and Isolation for Satellite Using Lipschitz Nonlinear Sliding-mode Observers

作　　者：王征[1] 李言俊[1] 张科[1] 

机构地区：[1]西北工业大学航天学院,西安710068

出　　处：《空间科学学报》2011年第6期794-799,共6页Chinese Journal of Space Science

基　　金：航空科学基金(20090153003);基础研究基金(G9KY1004)共同资助

摘　　要：航天器模型存在非线性问题,但其小角度在轨运行时满足lipschitz条件,可以在这种情况下进行故障检测,提高系统的安全性.应用滑模非线性观测器,针对多执行器设计了多通道故障检测观测器,通过Lyapunov函数对其收敛性进行证明.结果表明,观测器不仅能够实现故障检测,还能够实现故障的隔离,并利用反证法进行了说明.应用线性矩阵不等式,给出了观测器参数的求解,进而对卫星建模及仿真,与线性化方法进行比对,验证了算法的有效性.Spacecrafts are nonlinear systems. But when they are orbiting in small angles, their models correspond with Lipschitz condition. Fault detection technology could be used to insure safety of the system under these circumstances. With application of the nonlinear sliding mode method, a series of multi-channel fault detection observers for the actuators was designed. The convergence of the observers was proved by choosing a proper Lyapunov function. The observers designed for the spacecraft can realize the isolation of the faults, and this was illustrated with absurdity. The parameters of the observer were derived from the application of linear matrix inequalities. Finally, modeling and simulation were conducted for a certain satellite, and it is compared with linearization method to verify the effectiveness of the proposed algorithm.

关 键 词：航天器 卫星 线性矩阵不等式 滑模观测器 

分 类 号：V467[航空宇航科学与技术—航空宇航制造工程]