Sensor and Actuator Fault Isolation Using Parameter Interval based Method for Nonlinear Dynamic Systems
نویسندگان
چکیده
Fault detection and isolation (FDI) problem for nonlinear dynamic systems has received more and more attentions recently. The significant results mainly belong to three kinds of methods: The method based on nonlinear geometrical theory (1; 2; 3), based on parity space theory (4; 5) and based on adaptive observers (6; 7). The application of the first one is limited because there is not always suitable framework of decoupling for a general nonlinear dynamic system. The method based on parity space theory has only been studied for some special systems. The speed of adaptive observers based method is not ideal due the parameter identification which lasts a long time. In our previous work, we have put forward a parameter interval based method for nonlinear dynamic systems with respect to the faults of the dynamic part of the system (8; 9; 10). This method fits many kinds of nonlinear dynamic systems, its isolation speed is fast. In this paper, this method is extended to sensor and actuator fault isolation problems for nonlinear dynamic systems. The example shows good performance of this method for sensor and actuator fault isolations for nonlinear dynamic systems.
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