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Lubricants
Volume 14
Issue 7
10.3390/lubricants14070261
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Coupled Model of Point-Contact Thermo-Elastohydrodynamic Lubrication and Dynamics with Double-Impact Mechanism for High-Precision Quantitative Diagnosis of Rolling Bearings

by
Wei Jin
1,2,
Chao Liu
1,
Tongtong Liu
1,*,
Jinfeng Huang
3,
Chengshi Zhang
1,
Feng Jin
4,
Feibin Zhang
3 and
Chao Zhang
1
1
Inner Mongolia Key Laboratory of Intelligent Diagnosis and Control of Mechatronic System, Inner Mongolia University of Science and Technology, Baotou 014010, China
2
Department of Chemical and Materials Engineering, Baotou Light Industry Vocational Technical College, Baotou 014035, China
3
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100080, China
4
Inner Mongolia Institute of Special Equipment Inspection and Research, Energy Equipment Intelligent Inspection and Safety Assurance Laboratory, Baotou 010020, China
*
Author to whom correspondence should be addressed.
Lubricants 2026, 14(7), 261; https://doi.org/10.3390/lubricants14070261
Submission received: 20 May 2026 / Revised: 24 June 2026 / Accepted: 26 June 2026 / Published: 30 June 2026
Versions Notes

Abstract

Accurate quantitative diagnosis of spall sizes in rolling bearings is often hindered by the limitations of conventional dynamic models in characterizing temperature-dependent contact behavior. To address this issue, this paper presents a quantitative diagnosis method that incorporates point-contact thermo-elastohydrodynamic lubrication (TEHL) characteristics into a classical bearing dynamic framework. Specifically, rather than using prescribed or constant contact parameters, an improved equivalent stiffness–damping representation of the bearing contact interface is formulated based on TEHL-derived oil-film pressure, thickness, and temperature, while taking into account the inner–outer raceway thermal asymmetry. This localized lubricated contact representation is subsequently integrated into a classical five-degree-of-freedom (5-DOF) dynamic model to evaluate the double-impact response caused by outer-ring spalls. Comparative simulations using conventional 5-DOF, 4-DOF, and 2-DOF models, alongside experiments on a 6205-2-RS bearing with a 0.6 mm outer-ring defect, validate the proposed method. The results demonstrate that utilizing the TEHL-derived stiffness–damping representation significantly reduces spall-size estimation errors, improving both the accuracy and the physical interpretability of bearing fault quantification under thermally coupled conditions.
Keywords: rolling bearing; thermo-elastohydrodynamic lubrication; dynamic modeling; quantitative diagnosis rolling bearing; thermo-elastohydrodynamic lubrication; dynamic modeling; quantitative diagnosis

Share and Cite

MDPI and ACS Style

Jin, W.; Liu, C.; Liu, T.; Huang, J.; Zhang, C.; Jin, F.; Zhang, F.; Zhang, C. Coupled Model of Point-Contact Thermo-Elastohydrodynamic Lubrication and Dynamics with Double-Impact Mechanism for High-Precision Quantitative Diagnosis of Rolling Bearings. Lubricants 2026, 14, 261. https://doi.org/10.3390/lubricants14070261

AMA Style

Jin W, Liu C, Liu T, Huang J, Zhang C, Jin F, Zhang F, Zhang C. Coupled Model of Point-Contact Thermo-Elastohydrodynamic Lubrication and Dynamics with Double-Impact Mechanism for High-Precision Quantitative Diagnosis of Rolling Bearings. Lubricants. 2026; 14(7):261. https://doi.org/10.3390/lubricants14070261

Chicago/Turabian Style

Jin, Wei, Chao Liu, Tongtong Liu, Jinfeng Huang, Chengshi Zhang, Feng Jin, Feibin Zhang, and Chao Zhang. 2026. "Coupled Model of Point-Contact Thermo-Elastohydrodynamic Lubrication and Dynamics with Double-Impact Mechanism for High-Precision Quantitative Diagnosis of Rolling Bearings" Lubricants 14, no. 7: 261. https://doi.org/10.3390/lubricants14070261

APA Style

Jin, W., Liu, C., Liu, T., Huang, J., Zhang, C., Jin, F., Zhang, F., & Zhang, C. (2026). Coupled Model of Point-Contact Thermo-Elastohydrodynamic Lubrication and Dynamics with Double-Impact Mechanism for High-Precision Quantitative Diagnosis of Rolling Bearings. Lubricants, 14(7), 261. https://doi.org/10.3390/lubricants14070261

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