Analysis of thermal dynamic  micro-EHL considering bearing assembly temperature

Liu, Xiaoling; Xin, Zhaoshun; Zhou, Jiangmin; Yang, Peiran

doi:10.1177/1350650120949082

Cited by 3 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, Cui et al 14 investigated the dynamic contact behavior of the hydrodynamic journal bearing during the start-up, the hydrodynamic oil force and asperity contact force are all considered. Liu et al 15 established a thermal elastohydrodynamic lubrication (TEHL) model considering the boundary temperature of the bearing. Wang et al 16 combined bearing dynamics and thermal EHL method and they found that under a certain bearing speed, the lubrication performance will deteriorate when an inappropriate axial load is applied.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the misalignment and modification for crown roller contacts under mixed lubrication

Pei,

Yang

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

A new contact model of finite-length crowned roller bearing, capable of handling lubrication, eccentric load, and misalignment situations, is established in this study. Simulation results of interface pressure, film thickness distribution, flash temperature, and subsurface stress can be obtained with different speeds, misalignment angles, load eccentricity, and roller trimming parameters. It is found that edge trimming can greatly reduce the stress concentration at the edge, and there are optimal trimming parameters to minimize the concentrated stress under normal load and eccentric load. When the eccentric load exceeds a certain angle, the increase in the maximum stress can be very large, which may lead to premature failure of the interface. Meanwhile, the staggering velocity caused by the misalignment of the roller axis also has a certain influence on the distribution of the lubricating film.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation of the misalignment and modification for crown roller contacts under mixed lubrication

Pei,

Yang

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

show abstract

“…Many foreign and native scholars have conducted a lot of research on the lubrication characteristics of the contact area of cylindrical roller bearings. Qiu et al [10][11][12][13] calculated the dynamic characteristics of the cylindrical roller bearing contact micro-zone, calculated the oil film thickness and analyzed the bearing lubrication characteristics by using the quasistatic method and the elastohydrodynamic lubrication (EHL) model. The thermal effect, non-Newtonian and other factors were considered based on the Dowson empirical formula by Marian et.al [14].…”

Section: Introductionmentioning

confidence: 99%

Calculation and Lubrication Characteristics of Cylindrical Roller Bearing Oil Film with Consideration of Thermal Effects

Zhang

Guo

et al. 2022

Coatings

View full text Add to dashboard Cite

Aiming at the problem of how the thermal characteristics of cylindrical roller bearings affect the lubrication characteristics of bearings under actual working conditions, the influence of parameters such as speed and load on the lubrication characteristics of cylindrical roller bearings under thermal effects is analyzed. The numerical calculation method combining the quasi-static model of cylindrical roller bearing and the thermal elastohydrodynamic lubrication model is adopted. The effects of rotational speed, load and thermal effect on the lubrication performance of the bearing and the lubrication state under certain oil supply conditions were analyzed via numerical model calculation. The oil film thickness was measured via an immersion ultrasonic method to verify the correctness of the model. The results show that the larger the bearing speed, the larger the central film thickness and the minimum film thickness. At the same time, the thermal effect on the film thickness is more obvious; the greater the load, the greater the maximum oil film pressure. The film thickness gradient in the inlet region is greatly reduced, but the thermal effect has no obvious effect on the overall film thickness. In addition, there is a critical value of effective lubrication film thickness for each set of operating parameters. When the actual film thickness is equal to the critical value, the bearing lubrication state is at its best; the numerical simulation results are compared with the experimental values. Under the calculation conditions, the maximum error at the measuring point is within 10%, which meets the error requirements and provides a theoretical basis for revealing the bearing lubrication mechanism.

show abstract

“…Alfares et al 26 built a coupling model of thermal analysis with dynamics for machine tool spindle-bearing system to research the effect of speed, temperature and lubricant on thermal condition of bearing system. Liu et al 27 presented a thermal EHL analysis model and investigated the influence of boundary temperature and surface bump of roller on thermal failure of bearing. Fang et al 28 proposed a mixed thermal EHL model for ball bearing with wear zone to investigate the lubricating characteristics including film thickness, pressure and interfacial temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal elastohydrodynamic lubrication on vibration characteristics of ball bearing with local defect

Wang

Yan

Zheng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

View full text Add to dashboard Cite

The vibration response of ball bearing with local defect is closely associated with its lubrication condition. The previous bearing dynamic models were mainly established based on the idealised lubrication conditions, which may not uncover the influence of thermal effect of lubricant on vibration characteristics of defective bearing. This paper presented the influence of thermal effect on elastohydrodynamic lubrication (EHL) performances of ball bearing and the vibration characteristics of defective bearing under thermal EHL. Considering the point contact thermal EHL and the time-varying displacement excitation, a dynamic model of ball bearing with a localised defect on outer raceway was developed. The model was validated by the experimental results. Compared with isothermal EHL, the simulation results with thermal EHL reveal larger pressure and thinner film thickness in the ball-raceway contact interface. Meanwhile, the rotating speed and radial load have significant effects on the thermal EHL performance of ball bearing. The effects of three contact conditions (dry friction, isothermal and thermal EHL) on vibration amplitude of defective bearing in frequency domain are discussed. The results show that the lubricant could improve the vibration of defective bearing, whereas the addition of thermal effect of EHL could increase the vibration amplitude and deteriorate the lubricating performance. The model is beneficial to the bearing model optimisation and the rational selection of lubricants.

show abstract

Analysis of thermal dynamic micro-EHL considering bearing assembly temperature

Cited by 3 publications

References 20 publications

Investigation of the misalignment and modification for crown roller contacts under mixed lubrication

Investigation of the misalignment and modification for crown roller contacts under mixed lubrication

Calculation and Lubrication Characteristics of Cylindrical Roller Bearing Oil Film with Consideration of Thermal Effects

Effect of thermal elastohydrodynamic lubrication on vibration characteristics of ball bearing with local defect

Contact Info

Product

Resources

About