Journal
ISA TRANSACTIONS
Volume 105, Issue -, Pages 320-334Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.isatra.2020.05.043
Keywords
Generalized minimax-concave penalty; Squared envelope spectrum kurtosis; Iterative reweight algorithm; Repetitive transient extraction; Machinery fault diagnosis
Categories
Funding
- National Natural Science Foundation of China [51605366, 91860125, 51405321]
- Fundamental Research Funds for the Central Universities, PR China [XJS190405, JB190411]
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The vibration signal of faulty rotating machinery tends to be a mixture of repetitive transients, discrete frequency components and noise. How to accurately extract the repetitive transients is a critical issue for machinery fault diagnosis. Inspired by reweighted L1 (ReL1) minimization for sparsity enhancement, a reweighted generalized minimax-concave (ReGMC) sparse regularization method is proposed to extract the repetitive transients. We utilize the generalized minimax-concave (GMC) penalty to regularize the weighted sparse representation model to overcome the underestimation deficiency of L1 norm penalty. Moreover, a new reweight strategy which is different from the reweight strategy in ReL1 for sparsity enhancement is proposed according to the statistical characteristic, i.e., squared envelope spectrum kurtosis. Then ReGMC is proposed by solving a series of weighted GMC minimization problems. ReGMC is utilized to process a simulated signal and the vibration signals of a hot-milling transmission gearbox and a run-to-failure bearing with incipient fault. The ReGMC analysis results and the comparison studies show that ReGMC can effectively extract the repetitive transients while suppressing the discrete frequency components and noise, and behaves better than GMC, improved lasso, and spectral kurtosis. (C) 2020 ISA. Published by Elsevier Ltd. All rights reserved.
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