Decentralized Fault Diagnosis and Prognosis Scheme for Interconnected Nonlinear Discrete-Time Systems
| Autor: | Hasan Ferdowsi, Sarangapani Jagannathan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Observer (quantum physics)
Computer science adaptive estimation Energy Engineering and Power Technology decentralized systems Fault (power engineering) Residual Fault detection and isolation Systems engineering Computer Science::Hardware Architecture TA168 Control theory Computer Science (miscellaneous) failure prediction Safety Risk Reliability and Quality Civil and Structural Engineering Interconnection Artificial neural network Mechanical Engineering fault diagnostics TA213-215 fault detection Engineering machinery tools and implements Nonlinear system Discrete time and continuous time interconnected systems |
| Zdroj: | International Journal of Prognostics and Health Management, Vol 8, Iss 1 (2017) |
| ISSN: | 2153-2648 |
| Popis: | This paper deals with the design of a decentralized fault diagnosis and prognosis scheme for interconnected nonlinear discrete-time systems which are modelled as the interconnection of several subsystems. For each subsystem, a local fault detector (LFD) is designed based on the dynamic model of the local subsystem and the local states. Each LFD consists of an observer with an online neural network (NN)-based approximator. The online NN approximators only use local measurements as their inputs, and are always turned on and continuously learn the interconnection as well as possible fault function. A fault is detected by comparing the output of each online NN approximator with a predefined threshold instead of using the residual. Derivation of robust detection thresholds and fault detectability conditions are also included. Due to interconnected nature of the overall system, the effect of faults propagate to other subsystems, thus a fault might be detected in more than one subsystem. Upon detection, faults local to the subsystem and from other subsystems are isolated by using a central fault isolation unit which receives detection time information from all LFDs. The proposed scheme also provides the time-to-failure or remaining useful life information by using local measurements. Simulation results provide the effectiveness of the proposed decentralized fault detection scheme. |
| Databáze: | OpenAIRE |
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