Bearing Fault Classification Using Wavelet Energy and Autoencoder

Today's modern industry has widely accepted the intelligent condition monitoring system to improve the industrial organization. As an effect, the data-driven-based fault diagnosis methods are designed by integrating signal processing techniques along with artificial intelligence methods. Various signal processing approaches have been proposed for feature extraction from vibration signals to construct the fault feature space, and thus, over the years, the feature space has increased rapidly. Also, the challenge is to identify the promising features from the space for improving diagnosis performance. Therefore, in this paper, wavelet energy is presented as an input feature set to the fault diagnosis system. In this paper, wavelet energy is utilized to represent the multiple faults for reducing the requirement of number features, and therefore, the complex task of feature extraction becomes simple. Further, the convolutional autoencoder has assisted in finding more distinguishing fault feature from wavelet energy to improve the diagnosis task using extreme learning machine. The proposed method testified using two vibration datasets, and decent results are achieved. The effect of autoencoder on fault diagnosis performance has been observed in comparison to principal component analysis (PCA). Also, the consequence has seen in the size of the extreme learning machine (ELM) architecture.