Journal
MATHEMATICS AND COMPUTERS IN SIMULATION
Volume 79, Issue 3, Pages 318-338Publisher
ELSEVIER
DOI: 10.1016/j.matcom.2007.12.004
Keywords
Bearing condition monitoring; Redundant lifting scheme; Shock pulse method
Categories
Funding
- National Natural Science Foundation of China [50335030]
- National High-tech R&D Program of China [2006AA04Z430]
- National Basic Research Program of China [2005CB724100]
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Due to the widespread application of rolling element bearings, it is necessary to effectively monitor their health status. The shock pulse method (SPM) has been widely used as a quantitative method for bearing condition monitoring. However, the shock value indicating the bearing condition may be mistakenly estimated by direct demodulation in the SPM. To overcome this deficiency, a new approach based on improved redundant lifting scheme (IRLS) is proposed. The classical redundant lifting scheme is improved by adding the normalization factors to avoid error propagation of decomposition results, and the IRLS is applied to preprocess the bearing vibration signals. Then the maximum normalized shock value of detail signals in decomposition results is used as a measure of the bearing condition. The effectiveness of the proposed method is demonstrated by applying it to both simulated signals and practical bearing vibration signals under different conditions. The results show that the proposed method is effective for bearing condition monitoring. (C) 2008 IMACS. Published by Elsevier B.V. All rights reserved.
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