Double-impulse feature extraction of faulty hybrid ceramic ball bearings based on DTCWPT

Yuyun Lu1, Yu Guo2

Key Laboratory of Vibration and Noise under Ministry of Education of Yunnan Province,
Kunming University of Science and Technology, Kunming, China

2Corresponding author

E-mail: 1kmluyuyun@163.com, 2kmgary@163.com

Received 12 September 2017; accepted 18 September 2017

DOI https://doi.org/10.21595/vp.2017.19105

 

Abstract. Fatigue spalling is one of the main reasons for rolling element bearing fault. When spalling fault occurs in the bearing raceway and the rolling balls are in and outside the stripping, the vibration signal changes. When rolling elements enters the fault zone, a step response is generated, which mainly consists of lower frequency components. When rolling elements exits the fault zone, an impulse response is generated with a wide bandwidth. To effectively separate these two types of signal characteristics is important to measure the length of peeling zone for ceramic ball bearing. In our research, we proposed a method of double-shock feature extraction for peeling failure of hybrid ceramic ball bearing based on double tree complex wavelet packet transform (DTCWPT). Firstly, in order to enhance the Signal Noise Ratio (SNR), the original vibration signal was denoised by double tree complex wavelet packet transform; Then, separating and extracting double impulse characteristics of the vibration signal from the hybrid ceramic ball bearing with the spalling failure by using Hilbert transform envelope algorithm. Experimental results showed that this method can effectively separate the double impulse characteristics of the hybrid ceramic ball bearing fault.

Keywords: envelope analysis, DTCWPT, hybrid ceramic ball bearing, double-impulses, bearing fault.

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Cite this article

Lu Yuyun, Guo Yu Double‑impulse feature extraction of faulty hybrid ceramic ball bearings based on DTCWPT. Vibroengineering PROCEDIA, Vol. 14, 2017, p. 51‑56.

 

JVE International Ltd. Vibroengineering PROCEDIA. Oct 2017, Vol. 14. ISSN 2345-0533