A New Quasi-Static Cylindrical Roller Bearing Model to Accurately Consider Non-Hertzian Contact Pressure in Time Domain Simulations

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Simon Kabus ◽  
Michael R. Hansen ◽  
Ole Ø. Mouritsen
Keyword(s):  
Fatigue Life ◽  
Time Domain ◽  
Roller Bearing ◽  
Rolling Bearing ◽  
Elastic Half Space ◽  
Hertzian Contact ◽  
Fatigue Life Analysis ◽  
Cylindrical Roller Bearing ◽  
Six Degree Of Freedom ◽  
Cylindrical Roller

The accuracy of the fatigue life calculations in rolling bearing simulations is highly dependent on the precision of the roller-raceway contact simulations. Several different methods exist to simulate these pressure distributions and in time domain bearing simulations, where many contacts need evaluation, the simple and time efficient methods are more popular, yielding erroneous life estimates. This paper presents a new six degree of freedom frictionless quasi-static time domain cylindrical roller bearing model that uses high precision elastic half-space theory to simulate the contact pressures. The potentially higher computational demand using the advanced contact calculations is addressed by preprocessing a series of contacts at different centerline approaches and roller tilt angles, which are used for interpolating contact results during time domain simulations. It is demonstrated that this new model allows for simulation of bearing misalignments, roller centrifugal forces, and flange contact induced roller tilt moments, and that the effect of these conditions is directly evaluated in a detailed fatigue life analysis. Finally, the stiffness of the bearing model is validated against existing experimental data with good correlation.

Fatigue life of cylindrical roller bearings

2016 ◽  
Vol 231 (5) ◽  
pp. 623-636 ◽  
Author(s):  
Van-Canh Tong ◽  
Sun-Woong Kwon ◽  
Seong-Wook Hong
Keyword(s):  
Fatigue Life ◽  
Roller Bearing ◽  
Radial Clearance ◽  
Angular Misalignment ◽  
Error Sources ◽  
Roller Bearings ◽  
Fatigue Life Analysis ◽  
Inertial Loading ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

This paper dealt with the fatigue life of cylindrical roller bearings with several significant error sources that may occur during installations. A four degree-of-freedom quasi-static model for cylindrical roller bearings was developed, which took into account potential error sources such as angular misalignment, axial offset, and radial clearance, together with inertial loading by rotational speed and induced moment loads. A 3D contact model was employed to provide contact pressure distributions in rolling elements. The fatigue life of a cylindrical roller bearing was analyzed as a function of angular misalignment under various loading conditions. Then, the fatigue life analysis was extended to the combined effects of radial clearance, axial offset, and the number of rollers, along with angular misalignment. The computational results showed the significance of each error source on fatigue life. They further showed that cylindrical roller bearing fatigue life maximized when the radial clearances were slightly negative, and that it increased almost linearly with the number of rollers.

Analysis of Fatigue of Cylindrical Roller Bearing in Printing Press

2013 ◽  
Vol 312 ◽  
pp. 25-28
Author(s):  
Ji Mei Wu ◽  
Yan Chen ◽  
Bo Gao ◽  
Tuan Yong Yi
Keyword(s):  
Fatigue Life ◽  
Roller Bearing ◽  
Flow Chart ◽  
Printing Press ◽  
Radial Clearance ◽  
Radial Load ◽  
Double Row ◽  
Rotating Speed ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

By means of considering improved Lundberg-Palmgren (L-P) fatigue life theory and rollers and other comprehensive factors, a model of fatigue life is setup for eccentric double row cylindrical roller bearing under rotation. On this basis, the calculation flow chart is given and the fatigue life is calculated. Then come to the conclusions that the fatigue life of bearing is influenced by radial load, rotating speed, radial clearance.

STUDY OF MODIFIED FATIGUE LIFE OF CYLINDRICAL ROLLER BEARING UNDER LUBRICATION REGIME

2019 ◽  
Author(s):  
Aline de Almeida Soares ◽  
Natália Akemi Hoshikawa Tsuha ◽  
Katia Lucchesi Cavalca Dedini
Keyword(s):  
Fatigue Life ◽  
Roller Bearing ◽  
Lubrication Regime ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

Cage Instabilities in Cylindrical Roller Bearings

2004 ◽  
Vol 126 (4) ◽  
pp. 681-689 ◽  
Author(s):  
Niranjan Ghaisas ◽  
Carl R. Wassgren ◽  
Farshid Sadeghi
Keyword(s):  
High Speed ◽  
Roller Bearing ◽  
Degree Of Freedom ◽  
Stable Motion ◽  
Roller Bearings ◽  
Light Load ◽  
Cylindrical Roller Bearing ◽  
Six Degree Of Freedom ◽  
Cylindrical Roller ◽  
Inner Race

A six-degree-of-freedom model was developed and used to simulate the motion of all elements in a cylindrical roller bearing. Cage instability has been studied as a function of the roller-race and roller-cage pocket clearances for light-load and high-speed conditions. The effects of variation in inner race speed, misalignment, cage asymmetry, and varying size of one of the rollers have been investigated. In addition, three different roller profiles have been used to study their impact on cage dynamics. The results indicate that the cage exhibits stable motion for small values of roller-race and roller-cage pocket clearances. A rise in instability leads to discrete cage-race collisions with high force magnitudes. Race misalignment leads to a rise in instability for small roller-cage pocket clearances since skew control is provided by the sides of the cage pocket. One roller of larger size than the others causes inner race whirl and leads to stable cage motion for small roller-race clearances without any variation in roller-cage pocket clearance. Cage asymmetry and different roller profiles have a negligible impact on cage motion.

Optimal Bearing Housing Designing Using Topology Optimization

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Simon Kabus ◽  
Claus B. W. Pedersen
Keyword(s):  
Topology Optimization ◽  
Fatigue Life ◽  
Load Distribution ◽  
Roller Bearing ◽  
Fe Model ◽  
Internal Load ◽  
Housing Design ◽  
Nonlinear Springs ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

The internal load distribution in rolling bearings has a high impact on the bearing fatigue life. This study presents a method to optimize roller bearing housing design in order to maximize the bearing fatigue life by ensuring an optimal internal load distribution. An FE-model of a cylindrical roller bearing utilizing nonlinear springs in the roller modeling is presented, which is capable of simulating the bearing load distribution efficiently. The optimal load distribution is achieved by specifying the desired internal load distribution as design constraints in a topology optimization of the bearing housing design. The superiority of the method is clearly demonstrated through case studies involving a cylindrical roller bearing, where it is shown that the fatigue life is increased and the bearing housing mass and roller contact misalignment is reduced.

Axial Load Effect on Contact Fatigue Life of Cylindrical Roller Bearings

2004 ◽  
Vol 126 (2) ◽  
pp. 242-247 ◽  
Author(s):  
Wangquan (Winston) Cheng ◽  
Shan Shih ◽  
John Grace ◽  
Wenke Tu
Keyword(s):  
Fatigue Life ◽  
Axial Load ◽  
Roller Bearing ◽  
Contact Fatigue ◽  
Limit Load ◽  
Load Effect ◽  
Roller Bearings ◽  
Contact Fatigue Life ◽  
Fatigue Life Analysis ◽  
Cylindrical Roller

Besides primarily carrying radial load, cylindrical roller bearings with flanges or lips on both inner and outer raceways need also carry axial load in some applications. Because of the axial load, the equivalent dynamic load of the bearing will be increased and the bearing contact fatigue life will be decreased accordingly. The axial load effect on the roller bearing fatigue life had been studied by researchers in the past. Because of different assumptions used in their models, quite different predictions were made in their analysis. This work combines the methods used in the Fernlund-Synek and Brandlein models and studies general contact conditions such as partial contact along the roller length, partial loading zone of the bearing race, manufacturing tolerance and running-in effects on roller length, etc. New formulas for equivalent dynamic loads of the rotating and stationary races are derived. A fatigue limit load is also included in the life calculation to reflect the latest development in contact fatigue life analysis.

scholarly journals Lubrication and Fatigue Life Evaluation of High-Speed Cylindrical Roller Bearing under Misalignment

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hongyu Duan ◽  
Jiawei Song ◽  
Zhijian Wang
Keyword(s):  
Fatigue Life ◽  
High Speed ◽  
Roller Bearing ◽  
Coupled Model ◽  
Roller Bearings ◽  
Life Model ◽  
Fatigue Life Evaluation ◽  
Roller Profile ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

This paper developed a coupled model, incorporating the quasistatic model, fatigue life model, and mixed lubrication model, to investigate the effect of misalignment angle on high-speed cylindrical roller bearings. The model is verified by comparing with the published literature results. Then, a parametric analysis is carried out. The results show that as the misalignment increases, the load distribution is basically unchanged, but the fatigue life of the roller bearing decreases due to the variation of contact pressure, and the skewing moment of single roller contact pair increases. Furthermore, the optimal design of roller profile needs to consider the effect of lubrication in order to improve the fatigue life of roller bearings. In general, the optimal crown drop is too small according to the design from the slicing technique.

Effect of Varying the Number of Rollers on Dynamics of a Cylindrical Roller Bearing

2014 ◽  
Author(s):  
Aditya Sharma ◽  
M. Amarnath ◽  
P. K. Kankar
Keyword(s):  
Nonlinear Dynamic ◽  
Fourier Transforms ◽  
Roller Bearing ◽  
Hertzian Contact ◽  
Design Stage ◽  
Nonlinear Dynamic Model ◽  
Rotor Bearing ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller ◽  
Bearing System

In present paper, nonlinear dynamic model has been developed for cylindrical roller bearings. The Hertzian contact theory is used to derive a two degree of freedom model which considers nonlinearity due to clearance. The nonlinear dynamic behaviour of cylindrical roller bearing has been studied with varying number of rollers supporting load. The modified Newmark-β numerical integration technique has been used to solve the equations of motion. All the results are presented in the form of Fast Fourier Transforms and Poincarè maps. As the number of rollers is increases, system becomes stiffer. The results show that the number of rollers supporting load is one of the important parameters affecting the dynamics of rotor bearing system. Therefore, it must be considered at the design stage to understand the dynamic characteristics and stability of the rotor bearing system.

scholarly journals The use of FEM to evaluate the influence of logarithmic correction parameters of roller generators on the axle box bearing life

2021 ◽  
Vol 25 (1) ◽  
pp. 53-61
Author(s):  
Agniezka Chudzik ◽  
Bogdan Warda
Keyword(s):  
Fatigue Life ◽  
Roller Bearing ◽  
Operating Conditions ◽  
Logarithmic Correction ◽  
Stress Distributions ◽  
The Finite Element Method ◽  
General Application ◽  
Bearing Life ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

Abstract In the roller-raceway contacts of the radial cylindrical roller bearing used in the axle boxes of a railway bogie, pressure accumulation may occur, reducing the fatigue life. This accumulation can be eliminated by applying logarithmic correction of generators and in particular varieties of the modified logarithmic correction. The correction parameters should be adapted to the operating conditions of the bearing. This article presents a comparison of the predicted fatigue life of an axle box bearing on correctly selected correction parameters with bearing life, in which correction of roller generators was used, typical for cylindrical roller bearings of general application. The finite element method was used to determine the subsurface stress distributions necessary to calculate the fatigue life.

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