Fault diagnosis for high order systems based on model decomposition
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Fault detection observer and fault estimation filter are the main tools for the model based fault diagnosis approach. The dimension of the observer gain normally depends on the system order and the system output dimension. The fault estimation filter traditionally has the same order as the monitored system. For high order systems, these methods have the potential problems such as parameter optimization and the real time implementation on-board for applications. In this paper, the system dynamical model is first decomposed into two subsystems. The first subsystem has a low order which is the same as the fault dimension. The other subsystem is not affected by the fault directly. With the new model structure, a fault detection approach is proposed where only the residual of the first subsystem is designed to be sensitive to the faults. The residual of the second subsystem is totally decoupled from the faults. Moreover, a lower order fault estimation filter (with the same dimension of the fault) design algorithm is investigated. In addition, the design of a static fault estimation matrix is presented for further improving the fault estimation precision. The effectiveness of the proposed method is demonstrated by a simulation example.
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About this Article
- Fault diagnosis for high order systems based on model decomposition
International Journal of Control, Automation and Systems
Volume 11, Issue 1 , pp 75-83
- Cover Date
- Print ISSN
- Online ISSN
- Institute of Control, Robotics and Systems and The Korean Institute of Electrical Engineers
- Additional Links
- Fault diagnosis
- high order
- model decomposition
- Author Affiliations
- 1. Xiukun Wei and Limin Jia are with State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, 100044, China
- 2. Institute of Automation, Beijing Information Science and Technology University, Beijing, 100192, China