A new approach to intelligent fault diagnosis of rotating machinery

Authors:
Yaguo Lei;Zhengjia He;Yanyang Zi
Affiliations:
Department of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China;Department of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China and State Key Laboratory for Manufacturing Systems Engineering, Xi'an 710049, PR China;Department of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
Venue:
Expert Systems with Applications: An International Journal
Year:
2008

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Abstract

This paper presents a new approach to intelligent fault diagnosis based on statistics analysis, an improved distance evaluation technique and adaptive neuro-fuzzy inference system (ANFIS). The approach consists of three stages. First, different features, including time-domain statistical characteristics, frequency-domain statistical characteristics and empirical mode decomposition (EMD) energy entropies, are extracted to acquire more fault characteristic information. Second, an improved distance evaluation technique is proposed, and with it, the most superior features are selected from the original feature set. Finally, the most superior features are fed into ANFIS to identify different abnormal cases. The proposed approach is applied to fault diagnosis of rolling element bearings, and testing results show that the proposed approach can reliably recognise different fault categories and severities. Moreover, the effectiveness of the proposed feature selection method is also demonstrated by the testing results.