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Bearing Fault Diagnosis Based on the Switchable Normalization SSGAN with 1-D Representation of Vibration Signals as Input
Open AccessArticle

A Novel Health Indicator Based on Cointegration for Rolling Bearings’ Run-To-Failure Process

Army Engineering University, No. 97 Heping West Road, Shijiazhuang 050003, China
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Author to whom correspondence should be addressed.
Sensors 2019, 19(9), 2151; https://doi.org/10.3390/s19092151
Received: 27 March 2019 / Revised: 3 May 2019 / Accepted: 4 May 2019 / Published: 9 May 2019
The extraction of rolling bearings’ degradation features has been developed for decades. However, the degradation features always present different trends of different run-to-failure data. To find a consistent indicator of different data will be helpful to establish a general model and explore the nature of bearings’ degradation. In this study, we have found there is a trend of similarity between the energy and complexity features. By using the cointegration test, we found the two kinds of features exhibit a certain degree of cointegration relationship. Fused by the cointegration method, we have obtained a novel health indicator which can depict different run-to-failure data in a unified way. The difference between the energy features and complexity features can be explained by the novel health indicator. The indicator has “two-stage” characters. The first stage is the zero-line stage and the second stage is the quickly raise stage, which presents like an exponential function. It is easy to think about using an exponential degradation model to model this indicator. Next, we have compared the indicator to root mean square (RMS) by using the exponential degradation model. It shows that the indicator is more suitable for the exponential degradation model. In this paper, we used eleven run-to-failure data to verify the generality and “two-stage” characters of the proposed indicator. The result shows that the novel indicator is general and effective and that it will promote the development of bearings’ prognostics. View Full-Text
Keywords: rolling bearings; degradation model; generalization; vibration signal rolling bearings; degradation model; generalization; vibration signal
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Li, H.; Li, Y.; Yu, H. A Novel Health Indicator Based on Cointegration for Rolling Bearings’ Run-To-Failure Process. Sensors 2019, 19, 2151.

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