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. 2020 Feb 7;20(3):885. doi: 10.3390/s20030885

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© 2020 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Time signal for (a) 1st hole and (b) 79th hole of vibration. The wavelet packet signal for (c) 1st hole and (d) 79th hole of vibration. Data taken in Z direction, and the signal is of cutting condition CC2.