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. 2012 Mar 29;12(4):4381–4398. doi: 10.3390/s120404381

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© 2012 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 6. — Comparative analysis on feature extraction of vibration acceleration signal in the case of rolling element failure: (a) Local spectrum; (b) Demon spectra; (c) Demon spectra of the signal obtained from adaptive redundant lifting and single branch reconstruction of the node-signal.

Figure 6. — Comparative analysis on feature extraction of vibration acceleration signal in the case of rolling element failure: (a) Local spectrum; (b) Demon spectra; (c) Demon spectra of the signal obtained from adaptive redundant lifting and single branch reconstruction of the node-signal.