Bubble Flow Analysis of High Speed Cylindrical Roller Bearing under Fluid-Solid Thermal Coupling

International Journal of Rotating Machinery ◽

10.1155/2017/8372176 ◽

2017 ◽

Vol 2017 ◽

pp. 1-11

Author(s):

Li Cui ◽

Wenxia Wang ◽

Zhang Yanlei

Keyword(s):

High Speed ◽

Volume Fraction ◽

Numerical Study ◽

Roller Bearing ◽

Generation Model ◽

Bubble Flow ◽

Thermal Coupling ◽

Air Volume ◽

Cylindrical Roller Bearing ◽

Cylindrical Roller

Heat generation model of high speed cylindrical roller bearing is constructed by calculating the local friction in the bearing. Bubble flow calculation model of roller bearing considering fluid-solid thermal coupling is constructed based on two-body fluid model and k-ε turbulent model, in which diameter and size of bubbles, breakup, and coalescence model of bubbles are considered. Using dynamic mesh method, a new method for evaluating bearing temperature is set up treating the rolling elements as moving heat sources. Based on these models and finite element method, bubble flow of a high speed roller bearing is studied based on FLUENT software. The numerical study reveals the relationship between velocity of bearing, air volume fraction, and velocity and pressure of oil-air flow. An increase of air content in the oil produces a lower pressure at the bearing outlet while the exit fluid velocity increases. When fluid-solid thermal coupling effect is considered, velocity and pressure at outlet of the bearing both become larger, while temperature of bearing is lower than that without coupling. In comparison, the coupling effects on flow pressure and temperature are obvious. For a given rotating speed, there is an optimal value for air volume fraction, such that temperature rise of the bearing reaches the lowest value. Experiments verify the outcomes of the method presented in this paper.

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Skidding research of a high-speed cylindrical roller bearing with beveled cage pockets

Industrial Lubrication and Tribology ◽

10.1108/ilt-10-2019-0414 ◽

2020 ◽

Vol 72 (7) ◽

pp. 969-976

Author(s):

Yanbin Liu ◽

Zhanli Zhang

Keyword(s):

Peer Review ◽

Tilt Angle ◽

High Speed ◽

Hydrodynamic Lubrication ◽

Roller Bearing ◽

Front Wall ◽

Dynamics Model ◽

Content Type ◽

Cylindrical Roller Bearing ◽

Cylindrical Roller

Purpose This study aims to uncover the influencing mechanism of the tilt angles of the cage pocket walls of the high-speed cylindrical roller bearing on the bearing skidding. Design/methodology/approach A novel cylindrical roller bearing with the beveled cage pockets was proposed. Using the Hertz contact theory and the elastohydrodynamic and hydrodynamic lubrication formulas, the contact models of the bearing were built. Using the multibody kinematics and the Newton–Euler dynamics theory, a dynamics model of the bearing was established. Using the Runge–Kutta integration method, the dynamics simulations and analysis of the bearing were performed. Findings The simulation results show that the effects of the tilt angles of the front and rear walls of the pocket on the bearing skidding are remarkable. Under a 5° tilt angle of the front wall of the pocket and a 10° tilt angle of the rear wall, the bearing skidding can be effectively decreased in the rotational speed range of 10,000-70,000 r/min. Originality/value In this paper, a novel cylindrical roller bearing with the beveled cage pockets was proposed; a dynamics model of the bearing was established; the influence mechanism of the tilt angles of the front and rear walls of the pocket on the bearing skidding was investigated, which can provide fundamental theory basis for optimizing the pocket. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2020-0035/

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Stiffness Analysis of High-speed Cylindrical Roller Bearing Subjected to Combined Loads

10.1109/phm-nanjing52125.2021.9613096 ◽

2021 ◽

Author(s):

Yaoyu Han ◽

Lihua Yang ◽

Tengfei Xu ◽

Endian Xu

Keyword(s):

High Speed ◽

Roller Bearing ◽

Stiffness Analysis ◽

Combined Loads ◽

Cylindrical Roller Bearing ◽

Cylindrical Roller

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Experimental Study on the Skidding Damage of a Cylindrical Roller Bearing

Materials ◽

10.3390/ma13184075 ◽

2020 ◽

Vol 13 (18) ◽

pp. 4075 ◽

Cited By ~ 1

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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