基于观测器的航天器执行机构失效故障重构

针对刚体航天器在轨运行时存在执行机构失效故障和外部干扰问题,提出了一种基于观测器的故障检测与重构方法.该方法运用迭代学习技术,利用上一步的执行机构故障观测信息来估计当前的故障信息,并最终实现故障的精确重构.此外基于Lyapunov方法从理论上证明了此故障诊断方法能够实时、在线地实现对常值、时变甚至随机型的执行机构失效故障的重构,并且对外干扰力矩具有一定的鲁棒性.最后,仿真结果验证了该方法的有效性.

Observer Based Fault Reconstruction for Spacecraft Under Loss of Actuator Effectiveness

In this paper,an observer-based fault detection and isolation(FDI) method is developed to detect actuator faults of a spacecraft in the presence of external disturbances.By employing the iterative learning technique,the designed FDI uses the last step information from observer to estimate the current fault signal.Lyapunov analysis shows that the reconstructed signal can approximate the fault signal to any accuracy with fairly good performance by using the proposed FDI,and can be implemented online and in re...