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基于高增益鲁棒滑模观测器的故障检测和隔离

DOI: 10.3724/SP.J.1004.2012.02005, PP. 2005-2013

Keywords: 故障检测,故障隔离,滑模观测器,辅助输出

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Abstract:

?针对一类同时具有执行器和传感器故障的不确定线性系统,讨论了基于观测器的故障检测和隔离方法.首先,通过引入增维向量,使得在构造的增维系统中,故障向量包含了原系统的执行器故障和传感器故障.通过构造辅助输出使增维系统的观测器匹配条件得以满足,同时设计高增益滑模观测器对辅助输出进行估计.然后,对增维系统构造鲁棒滑模观测器并用作故障检测观测器,通过滑模控制项来抑制干扰,使观测器具有鲁棒性.在此基础上,结合多观测器故障隔离思想,提出了可以同时对执行器故障和传感器故障进行检测和隔离的方法.最后,通过对一个五阶飞行器模型进行仿真,证明了所提方法的有效性.

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