一种基于滑模变结构观测器的故障检测方法

提出一种基于滑模变结构观测器的残差生成及故障检测方法.利用滑模变结构所具有的对未知输入扰动的不变性,移除外界扰动对残差的影响,使残差只对故障信号敏感,从而提高故障检测的准确性,较好地解决基于状态估计的故障检测方法中检测鲁棒性与灵敏度之间的矛盾.仿真验证结果表明了该故障检测方法有较高的检测鲁棒性,同时对小幅值故障较为灵敏.

A Fault Detection Approach Based on Sliding Mode Observers

In order to achieve an optimal trade-off between the robustness against unknown inputs and the fault detectability,an observer-based residue generation and fault detection method applying sliding mode observer is presented in this paper.Taking advantage of the essential feature of sliding mode variable structure technology,being completely insensitive to unknown input disturbances,the generated residue of the designed fault detection system is not affected by the unknown input,but still keeps high sensitivi...