Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 66-67, Issue -, Pages 597-611Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2015.06.018
Keywords
Gearbox fault diagnosis; Match pursuit; Correlation filtering; Coupling modulation separation
Categories
Funding
- National Natural Science Foundation of China [51475169, 51475170]
- Natural Science Foundation of Guangdong Province [S2013030013355]
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The vibration signal of faulty gearbox commonly involves complex coupling modulation components. The method of sparse representation has been successfully used for gearbox fault diagnosis, but most of the literatures only focus on the extraction of impact modulation and always neglect the steady modulation representing the distributed faults. This paper presents a new method for separating coupling modulation from vibration signal of gearbox based on match pursuit and correlation filtering. To separate the steady modulation caused by distributed fault and the impact modulation caused by impact fault, two sub-dictionaries are specially designed according to the gearbox operating and structural parameters and the characteristics of vibration signal. The new dictionaries have clear physical meaning and good adaptability. In addition, an amplitude recovery step is conducted to improve the matching accuracy in the match pursuit. Simulation and experimental results show that the proposed method can separate the coupling components of gearbox vibration signal effectively under intensive background noise. (C) 2015 Elsevier Ltd. All rights reserved.
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