Normal distribution

Statistics

Deep learning

Image (mathematics)

Image segmentation

Geology

Pattern recognition (psychology)

Artificial intelligence

Wavelet packet decomposition

Seismology

Generalized normal distribution

Fault (geology)

Wavelet transform

Bearing (navigation)

Mathematics

Computer science

Wavelet

Feature extraction

Convolutional neural network

Segmentation

Deep belief network

Noise (video)

IEEE Transactions on Reliability

Bearing fault diagnosis is of significance to ensure the safe and reliable operation of a motor. Deep learning provides a powerful ability to extract the features of raw data automatically. A convolutional deep belief network (CDBN) is an effective deep learning method. In this article, a novel vibration amplitude spectrum imaging feature extraction method using continuous wavelet transform and image conversion is proposed, which can extract the image features with two-dimensional and eliminate the effect of handcrafted features under low signal-to-noise ratio conditions, different operating conditions, and data segmentation. Then, a novel CDBN with Gaussian distribution is constructed to learn the representative features for bearing fault classification. The proposed method is tested on motor bearing dataset with four and ten classifications. The results have been compared with other methods. The experiment results show that the proposed method has achieved significant improvements and is more effective than the traditional methods.

Intelligent Diagnosis Using Continuous Wavelet Transform and Gauss Convolutional Deep Belief Network