Abstract
In order to increase robustness of the AERS (Aero-engine Rotor System) and to solve the problem of lacking fault samples in fault diagnosis and the difficulty in identifying early weak fault, we proposed a new method that it not only can identify the early fault of AERS but also it can do self-recovery monitoring of fault. Our method is based on the analysis of the early fault features on AERS, and it combined the SVM (Support Vector Machine) with the stochastic resonance theory and the wavelet packet decomposition and fault self-recovery. First, we zoom the early fault feature signals by using the stochastic resonance theory. Second, we extract the feature vectors of early fault using the multi-resolution analysis of the wavelet packet. Third, we input the feature vectors to a fault classifier, which can be used to identify the early fault of AERS and carry out self-recovery monitoring of fault. In this paper, features of early fault on AERS, the zoom of early fault characteristics, the extraction method of early fault characteristics, the construction of multi-fault classifier and way of fault self-recovery monitoring are studied. Results show that our method can effectively identify the early fault of AERS, especially for identifying of fault with small samples, and it can carry on self-recovery monitoring of fault.
Highlights
With the development of the modern aviation industry, the safety of aircraft and reliability are more and more attracted
In order to increase robustness of the AERS (Aero-engine Rotor System) and to solve the problem of lacking fault samples in fault diagnosis and the difficulty in identifying early weak fault, we proposed a new method that it can identify the early fault of AERS and it can do self-recovery monitoring of fault
Our method is based on the analysis of the early fault features on AERS, and it combined the SVM (Support Vector Machine) with the stochastic resonance theory and the wavelet packet decomposition and fault self-recovery
Summary
With the development of the modern aviation industry, the safety of aircraft and reliability are more and more attracted. The engine is heart of aircraft and AERS is central part of engine. If AERS has fault in flight, the aircraft would be severely threatened in safety. In the early failures occurred, if we can catch timely the fault information, and can effectively identify it and carry on self-recovery monitoring of fault, it will have important significance to eradicate or eliminate the potential fault caused of an accident. Fault identification on AERS is widely studied and many results are obtained [1−3]. Effective identification of early fault has more difficulty. Obtaining of the early fault information is more difficulty, and effectiveness of fault
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