A reliability assessment model for journal bearing based on natural degradation and random shocks
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DOI 10.1007/s12206-020-1022-6
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1022-6 Keywords: · Random shocks · Competing failure · Wear degradation · Element concentration · Reliability analysis
Correspondence to: Yourui Tao [email protected]
A reliability assessment model for journal bearing based on natural degradation and random shocks Yourui Tao1,2, Jun Zhao1,2 and Shizhe Feng1,2 1
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, HeBei University of Technol2 ogy, Tianjin City 300401, China, College of Mechanical Engineering, HeBei University of Technology, Tianjin City 300401, China
Abstract Citation: Tao, Y., Zhao, J., Feng, S. (2020). A reliability assessment model for journal bearing based on natural degradation and random shocks. Journal of Mechanical Science and Technology 34 (11) (2020) 4641~4648. http://doi.org/10.1007/s12206-020-1022-6
Received June 24th, 2020 Revised
August 14th, 2020
Accepted August 24th, 2020 † Recommended by Editor Chongdu Cho
In actual working conditions, journal bearing often suffers from natural degradation such as corrosion, wear, etc., and random shocks from the external environment. It is a problem of competitive failure of journal bearing caused by natural degradation and random shocks. A competition failure model with random shock is established. First, a degradation experimented system consisting of journal bearing bench, electromagnetic vibration bench and data acquisition was constructed. Then a reliability assessment model of journal bearing is established, the effect of external shocks is taken into the model. Finally, the element concentration of journal bearing lubrication is used as characteristic quantity. The analytical expression of journal bearing reliability is derived. The results showed that the proposed reliability model can accurately describe the wear process of bearing. The influence of impact strength on reliability is analyzed. The bearing is more likely to fail with the increase of impact strength. The extension proposed can be effectively applied to condition monitoring and reliability evaluation of journal bearing in the paper.
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
This Journal bearing is widely used as supporting element of rotation axis in mechanical field. The external shock is universal in In actual operation. The traditional life calculation is used to predict the bearing life, which will lead to the problem of over maintenance or lack of maintenance. For example, the long-term operation of wind turbines in harsh natural environment is affected by normal and extreme shocks, salt fog and other factors. The reliability will gradually decrease with the change of operation time and environment [1]. Therefore, it is of great significance to study the performance degradation of bearing with random shocks. Some references analyzed the performance degradation of bearing bas
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