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Sensors 2011, 11(1), 260-277; doi:10.3390/s110100260

Roller Bearing Fault Diagnosis Based on Nonlinear Redundant Lifting Wavelet Packet Analysis

1
Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Chao Yang District, Beijing, 100124, China
2
School of Mechanical & Electrical Engineering, Beijing University of Chemical Technology, Chao Yang District, Beijing, 100029, China
3
Graduate School of Bioresources, Mie University/1577 Kurimamachiya-cho, Tsu, Mie, 514-8507, Japan
*
Author to whom correspondence should be addressed.
Received: 7 November 2010 / Revised: 20 December 2010 / Accepted: 22 December 2010 / Published: 28 December 2010
(This article belongs to the Special Issue 10 Years Sensors - A Decade of Publishing)
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Abstract

A nonlinear redundant lifting wavelet packet algorithm was put forward in this study. For the node signals to be decomposed in different layers, predicting operators and updating operators with different orders of vanishing moments were chosen to take norm  of the scale coefficient and wavelet coefficient acquired from decomposition, the predicting operator and updating operator corresponding to the minimal norm value were used as the optimal operators to match the information characteristics of a node. With the problems of frequency alias and band interlacing in the analysis of redundant lifting wavelet packet being investigated, an improved algorithm for decomposition and node single-branch reconstruction was put forward. The normalized energy of the bottommost decomposition node coefficient was calculated, and the node signals with the maximal energy were extracted for demodulation. The roller bearing faults were detected successfully with the improved analysis on nonlinear redundant lifting wavelet packet being applied to the fault diagnosis of the roller bearings of the finishing mills in a plant. This application proved the validity and practicality of this method. View Full-Text
Keywords: roller bearings; nonlinear; redundant lifting wavelet packet; fault diagnosis roller bearings; nonlinear; redundant lifting wavelet packet; fault diagnosis
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Gao, L.; Yang, Z.; Cai, L.; Wang, H.; Chen, P. Roller Bearing Fault Diagnosis Based on Nonlinear Redundant Lifting Wavelet Packet Analysis. Sensors 2011, 11, 260-277.

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