ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 30 April 2007
Page Count: 9

Gearbox Fault Feature Extraction Using Hilbert Transform, S-Transform, and a Statistical Indicator

Fan, Xianfeng
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiaotong University, Shanghai

Zuo, Ming J.
Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta

(Received 11 August 2006; accepted 6 February 2007)

Abstract

Vibration analysis has been widely used in machine fault feature extraction and diagnosis of rotating machinery. The effects of modulation and nonstationarity in vibration signals collected from a faulty gearbox present challenges for fault feature extraction. Hilbert transform and S-transform have the ability to address these issues through demodulation and time-frequency analysis, respectively. In this paper, we propose to use a feature indicator to represent the S-transform coefficients. The proposed method integrates the advantages of Hilbert transform, S-transform, and the proposed feature indicator (FI). The validity of the proposed method is verified with a simulated signal and real gearbox vibration signals. Comparison studies show that the proposed method is more effective and does not require the operators to have a lot of diagnostic experience.

Keywords:
gearbox, fault features extraction, Hilbert transform, S-transform, feature indicator

Paper ID: JTE100758
DOI: 10.1520/JTE100758
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