关键词: 支持矢量机+;机器学习;航空发动机;故障诊断;人工神经元网络

Abstract: Most of artificial intelligent methods are based on theory of empirical risk minimization principle which may cause low aeroengine fault diagnosis rate even with large learning fault samples. In this paper, we present a new aeroengine intelligent fault diagnosis system model using support vector machines (SVM) which is based on an novel theory - structural risk minimization (SRM) inductive principle. Due to the binary classifier of common Support Vector Machines, we first develop a multi-class support vector machines for faults pattern recognition as described detailed in section 2. We then construct the diagnosis model via the multi-class SVM in section 3. Non-linear mapping relationship between faults patterns and faults performance can be induced by the model. Also the model can control learning generalization ability with SRM. In section 4, we use the model for turbofan engine gas fault diagnosis. The results show that the model is efficient for accurate and robust fault diagnosis, and only a few fault samples are necessary to be trained for new faults diagnosis.

Key words: Support vector machines~+;Aircraft engine;Fault diagnosis;Artifical neural network