Gear fault diagnosis method based on wavelet-packet independent component analysis and support vector machine with kernel function fusion

Lizheng Pan,Aiguo Song,Suolin Duan,Shigang She,Dashuai Zhu,Xianchuan Shi

doi:10.1177/1687814018811036

Lizheng Pan, Aiguo Song + Show 4 more

Open Access

https://doi.org/10.1177/1687814018811036

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Abstract

Aiming at the problem of gear fault diagnosis, in order to effectively extract the features and improve the accuracy of gear fault diagnosis, the method based on wavelet-packet independent component analysis and support vector machine with kernel function fusion is proposed in this research. The proposed wavelet-packet independent component analysis feature extraction method can effectively combine the advantages of wavelet packet and independent component analysis methods and acquire more comprehensive feature information. Besides, the proposed kernel-function-fusion support vector machine can well integrate the advantage characteristics of each kernel function. The energy features of wavelet packet coefficients are acquired with four-layer wavelet packet decomposition and then the extracted energy features are further optimized by the independent component analysis method. The kernel-function-fusion support vector machine method is adopted to realize the gear fault diagnosis. Two kernel function models with the best self-classification accuracy are employed to serve the gear fault diagnosis corporately. The test samples are primarily classified by the main kernel function model, and then some samples are selected to be reclassified with the other kernel function model. Finally, the two kernel function models cooperate to determine the type of test samples. The comparison investigations demonstrate that the proposed method based on wavelet-packet independent component analysis and support vector machine with kernel function fusion achieves very high diagnosis accuracy.

Highlights

In the industrial production process, in order to minimize the losses caused by machine fault, the state monitoring system and fault diagnosis system play a very important role in practical application
In order to more effectively extract the relevant features of gear faults and further improve the diagnostic accuracy, a fault diagnosis method based on waveletpacket independent component analysis (WP-ICA) and support vector machine (SVM) with kernel function fusion is proposed in this research
Through longitudinal and horizontal comparison and analysis, it is verified that the proposed wavelet packet (WP)-ICA feature extraction method combined with the proposed kernel-function-fusion SVM classification method can serve with higher fault diagnosis accuracy than traditional method

Summary

Introduction

In the industrial production process, in order to minimize the losses caused by machine fault, the state monitoring system and fault diagnosis system play a very important role in practical application. For the gear fault diagnosis, a single feature extraction method is usually adopted to acquire characteristic information of gear’s running states, and the measured vibration signal is complex and vulnerable to noise interference. In order to more effectively extract the relevant features of gear faults and further improve the diagnostic accuracy, a fault diagnosis method based on waveletpacket independent component analysis (WP-ICA) and SVM with kernel function fusion is proposed in this research.

Results

Conclusion