Actuator and Sensor Fault Reconstructions for Uncertain Lipschitz Nonlinear Systems Based on H∞ Observers
Actuator and Sensor Fault Reconstructions for Uncertain Lipschitz Nonlinear Systems Based on H∞ Observers
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DOI：
10.1002/asjc.1123
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发表时间：
2015-11-01
影响因子：
2.4
通讯作者：
Xu, Liyun
中科院分区：
文献类型：
--
作者：
Li, Xiaohang;Zhu, Fanglai;Xu, Liyun
研究了一类具有执行器故障、传感器故障和外部干扰的不确定Lipschitz非线性系统的故障重构问题。首先，通过扩展状态向量，将原系统转化为增广广义系统，然后设计H观测器，实现干扰解耦。由于传感器故障成为扩展状态向量的一部分，因此广义观测器不仅可以提供状态估计，而且可以进行传感器故障重构。其次，二阶高增益滑模观测器被用来估计系统输出在有限时间内的导数。第三，利用状态和输出导数的估计，提出了一种代数执行器故障重构方法。最后通过仿真实例验证了该方法的有效性。
This paper considers fault reconstruction problems for a class of uncertain Lipschitz nonlinear systems with actuator faults, sensor faults, and external disturbances. First, by extending the state vector, the original system is transformed into an augmented descriptor system before an H observer, which can decouple the disturbances, is developed. Since the sensor faults become parts of the extended state vector, the descriptor observer can provide not only state estimates but also the sensor fault reconstructions. Second, a second-order high-gain sliding mode observer is used to estimate the derivatives of the system outputs in a finite time. Third, using the estimates of the states and the output derivatives, an algebraic actuator fault reconstruction method is proposed. Finally, a simulation example is given to validate the proposed method.