scholarly journals Thermal Elastohydrodynamic Lubrication Analysis of High-Speed and Light-Load Rolling Bearing with Double Rings Rotation

2022 ◽  
Vol 29 (1) ◽  
Keyword(s):  
High Speed ◽  
Elastohydrodynamic Lubrication ◽  
Rolling Bearing ◽  
Light Load

scholarly journals 5-DOF Dynamic Modeling of Rolling Bearing with Local Defect considering Comprehensive Stiffness under Isothermal Elastohydrodynamic Lubrication

2020 ◽  
Vol 2020 ◽  
pp. 1-15 ◽  
Author(s):  
Pengfei Yan ◽  
Changfeng Yan ◽  
Kai Wang ◽  
Fengtao Wang ◽  
Lixiao Wu
Keyword(s):  
Film Thickness ◽  
Life Prediction ◽  
High Speed ◽  
Elastohydrodynamic Lubrication ◽  
Rolling Bearing ◽  
Radial Clearance ◽  
Local Defect ◽  
Oil Film ◽  
Rolling Element ◽  
Film Stiffness

The sliding of the rolling element in the load zone would cause the bearing’s wear and failure at high speed under elastohydrodynamic lubrication (EHL) condition. Aiming at this phenomenon, considering lubrication oil film, time-varying displacement, radial clearance, and comprehensive stiffness, a five degree-of-freedom (DOF) dynamic model of rolling bearing with local defect is proposed based on isothermal EHL and which is validated by experimental data. The variation of oil film stiffness, comprehensive stiffness, and vibration characteristics of rolling bearing is studied under different speeds and loads. The results show that the lubricating oils with different viscosities have a certain influence on the bearing oil film thickness and comprehensive stiffness. As the load increases, the oil film stiffness and comprehensive stiffness would increase, and the oil film thickness would decrease. And as the tangential speed increases, the oil film stiffness would increase, and the oil film thickness and comprehensive stiffness would decrease. The vibration amplitude of the rolling bearing is enhanced with the increase of the rotation speed and the radial load. This model is helpful for the optimization, the correct use of lubricants, and life prediction of rolling bearing.

A high-speed and long-life triboelectric sensor with charge supplement for monitoring the speed and skidding of rolling bearing

Nano Energy ◽  
2021 ◽  
pp. 106747
Author(s):  
Zhijie Xie ◽  
Yu Wang ◽  
Rensuan Wu ◽  
Jihui Yin ◽  
Di Yu ◽  
...  
Keyword(s):  
High Speed ◽  
Rolling Bearing ◽  
Long Life

Quantitative Analysis of Reynolds and Navier–Stokes Based Modeling Approaches for Isothermal Newtonian Elastohydrodynamic Lubrication

2021 ◽  
Vol 143 (12) ◽  
Author(s):  
Leoluca Scurria ◽  
Tommaso Tamarozzi ◽  
Oleg Voronkov ◽  
Dieter Fauconnier
Keyword(s):  
High Speed ◽  
Stokes Equations ◽  
Thickness Distribution ◽  
Elastohydrodynamic Lubrication ◽  
Lubricant Film ◽  
Secondary Flows ◽  
Navier Stokes ◽  
Shear Stresses ◽  
Low Viscosity ◽  
Fluid Film Thickness

Abstract When simulating elastohydrodynamic lubrication, two main approaches are usually followed to predict the pressure and fluid film thickness distribution throughout the contact. The conventional approach relies on the Reynolds equation to describe the thin lubricant film, which is coupled to a Boussinesq description of the linear elastic deformation of the solids. A more accurate, yet a time-consuming method is the use of computational fluid dynamics in which the Navier–Stokes equations describe the flow of the thin lubricant film, coupled to a finite element solver for the description of the local contact deformation. This investigation aims at assessing both methods for different lubrication conditions in different elastohydrodynamic lubrication (EHL) regimes and quantify their differences to understand advantages and limitations of both methods. This investigation shows how the results from both approaches deviate for three scenarios: (1) inertial contributions (Re > 1), i.e., thick films, high speed, and low viscosity; (2) high shear stresses leading to secondary flows; and (3) large deformations of the solids leading to inaccuracies of the Boussinesq equation.

Micro-geometry lubrication and life ratings of rolling bearings

2010 ◽  
Vol 224 (12) ◽  
pp. 2610-2626 ◽  
Author(s):  
G E Morales-Espejel ◽  
A Gabelli ◽  
E Ioannides
Keyword(s):  
Surface Topography ◽  
Elastohydrodynamic Lubrication ◽  
Rolling Bearing ◽  
Machine Design ◽  
Quality Factors ◽  
Rolling Bearings ◽  
Average Roughness ◽  
New Developments ◽  
Remarkable Increase ◽  
Calculation Methodology

Following the pioneer work of Ertel-Grubin and Dowson and Higgingson, the field of elastohydrodynamic lubrication (EHL) has witnessed a remarkable increase in new developments, notably the incorporation into the analysis of roughness and other surface features (micro-EHL). This article describes the application of new developments in micro-EHL in the deduction of simple analytical formulations that might describe, in a better way, the lubrication of rolling bearings and the effects on life ratings. In this context the lubrication quality factors κ (used in rolling bearing technology) and Λ (generally applied in machine design) are critically compared and discussed. It is found that the commonly used average roughness, R q, is not quite able to properly account for the surface topography effect when the detailed micro-EHL response of the surface has to be accounted for. To this effect, the whole surface micro-geometry needs to be retained in the evaluation. A calculation methodology suitable for this type of analysis is proposed and used in a parametric evaluation of standard bearing surfaces.

scholarly journals Experimental Study on the Skidding Damage of a Cylindrical Roller Bearing

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4075 ◽  
Author(s):  
Qing Zhang ◽  
Jun Luo ◽  
Xiang-yu Xie ◽  
Jin Xu ◽  
Zhen-huan Ye
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Failure Modes ◽  
Roller Bearing ◽  
Weight Ratio ◽  
Operating Conditions ◽  
Roller Bearings ◽  
Light Load ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

As large-scale rotating machines develop toward high rotating speed and high power–weight ratio, skidding damage has become one of the major initial failure modes of cylindrical roller bearings. Therefore, understanding the skidding damage law is an effective way to ensure the safety of machines supported by cylindrical roller bearings. To realize the skidding damage, a high-speed rolling bearing test rig that can simulate the actual operating conditions of aviation bearings was used in this paper, and the skidding damage dynamic behaviors of cylindrical roller bearings were investigated. In addition, to ensure the accuracy of the obtained skidding damage mechanism, the cylindrical roller bearing was carefully inspected by microscopic analysis when the skidding damage occurred. Out results show that instantaneous increases in friction torque, vibration acceleration, and temperature are clearly observed when the skidding damage occurs in the cylindrical roller bearing. Furthermore, under the conditions of inadequate lubrication and light load, the critical speed of skidding damage is rather low. The major wear mechanisms of skidding damage include oxidation wear, abrasive wear, and delamination wear. The white layers are found locally in the inner ring and rollers under the actions of friction heat and shear force.

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