Statistical property feature extraction based on FRFT for fault diagnosis of analog circuits

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Abstract

Feature extraction plays an important role in the field of fault diagnosis of analog circuits. How to effectively extract fault features is crucial to diagnostic accuracy. The components tolerance and circuit nonlinearities of analog circuits can cause some part overlapping of primal signal among different component faults in time domain and frequency domain. Currently, the existing method aims at wavelet features, statistical property features, conventional frequency features and conventional time-domain features. There is no decoupling ability for the feature extraction methods mentioned above. To solve the problem, a new fault features extraction method is proposed. The diagnostic results are compared with those from other methods. Firstly, it is proposed to use the statistical property features of transformed signals by the fractional Fourier transform in the optimal fractional order domain as fault features, such as range, mean, standard deviation, skewness, kurtosis, entropy, median, the third central moment, and centroid. And then, KPCA is used to reduce the dimensionality of candidate features so as to obtain the optimal features. Next, normalization is applied to rescale input features. Finally, extracted features are trained by SVM to diagnose faulty components in analog circuits. The simulation results show that compared with traditional methods, the proposed method is quite efficient to improve diagnostic accuracy.

Keywords

Feature extraction Analog circuits Fault diagnosis Fractional Fourier transform Kernel principal component analysis Particle Swarm Optimization Within-class and among-class scatter matrix 
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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.School of Instrumentation Science and Opto-electronics EngineeringBeihang UniversityBeijingChina

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