Zhenwen Sheng, Yiheng He, Jing He, and Xinliang Hu
Sliding mode observer, reduced-order reconstruction, fault reconstruction
In this paper, a reduced-order fault reconstruction approach is proposed for a mismatched non-linear system with actuator faults, disturbances and uncertainties. First, such a system is separated into multiple sub-systems through state transformation, and then, reduced-order transformation is conducted on the system to transform the mismatched system into matched sub-systems to obtain a reduced-order model that is efficient for locally separating the effects of mismatched faults and disturbances. Then, a sliding-mode observer is designed for the reduced-order model by reconstructing the faults using the equivalent output injection principle. Finally, a fourth-order non-linear aircraft model is conducted to verify the effectiveness of the proposed method.
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