Establishment of a deep learning network based on feature extraction and its application in gearbox fault diagnosis

Abstract

Gearbox is an important part of mechanical equipment. If a fault cannot be timely detected, it will cause significant economic losses. In order to solve the problem of early fault diagnosis quickly and accurately, this paper proposes a feature extraction method by the decomposition of feature value to the waveform of signal, and inputs the extracted feature into the deep learning network established by this paper. Firstly, the input signal is reconstructed and the feature value is decomposed. Secondly, the extracted features are input into the established deep learning network as the deep learning signals to carry out fault diagnosis. Finally, the fault is identified by the established deep learning network. In a number of experiments, to compare with the existing some fault diagnosis methods, such as support vector machine, classical neural network, lifting wavelet and logical regression, the experimental results show that the average accurate recognition rate of the proposed method by established deep learning network based on feature value decomposition to fault diagnosis is 96.65%, its variance is 0.36 and the diagnostic speed is 0.612\xa0s. However, the average accuracy of the best diagnostic method at present is 93.52%, the variance is 0.47 and the diagnostic speed is 0.826\xa0s. It indicates that the proposed method has a good accuracy, stability and fastness.