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Journal ArticleDOI

Effect of manufacturing errors on load distribution in large diameter slewing bearings of fast breeder reactor rotatable plugs

01 May 2016-Vol. 230, Iss: 9, pp 1449-1460
TL;DR: In this article, an attempt has been made to find the influence of manufacturing errors on load distribution among the rolling elements using finite element method, which has been shown to improve the performance and life of the bearing.
Abstract: Fuel and other subassemblies in fast breeder reactor are handled through a combination of small rotatable plug, large rotatable plug and transfer arm. Rotation of the plugs is facilitated through large slewing bearings. These bearings are subjected to heavy loads and moments. Manufacturing errors on the rolling elements and races influence the load sharing among the elements. As a result, higher load acting on a rolling element causes excessive local deformation and unacceptable indentation. The higher load can also cause excessive sub-surface shear stress and fatigue failure of rolling races. Too stringent tolerances demand sophisticated machines, whereas liberal tolerances mean compromise on the performance and life of the bearing. There are no established methods for design of slewing bearings that include the influence of manufacturing errors. Hence, an attempt has been made to find the influence of manufacturing errors on load distribution among the rolling elements using finite element method. It is...
Citations
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Journal ArticleDOI
TL;DR: This work presented a comprehensive review of dynamic modelling and analysis methods for predicting the vibration characteristics of REBs with and without localized and distributed faults.
Abstract: Rolling element bearings (REBs) play a most critical role in various industrial machinery. A clearly and in-depth understanding of vibration characteristics of REBs is very helpful for condition monitoring and diagnosis applications for the machinery. This work presented a comprehensive review of dynamic modelling and analysis methods for predicting the vibration characteristics of REBs with and without localized and distributed faults. Main capabilities and limitations of those methods for both the localized and distributed faults have been described. Explanations for the generations of the bearing vibrations were also reviewed. A summary of the literature was given followed by the recommendations of current and future research works. Moreover, recent challenges, directions and implications in research works on the dynamic modelling and analysis methods of the localized and distributed faults in REBs have also been conducted.

99 citations

Journal ArticleDOI
TL;DR: In this article, a procedure for the determination of the interferences between balls and raceways in four contact point slewing bearings due to manufacturing errors is presented, and finite element analyses are performed for the friction torque calculation, considering different preloads.

24 citations

Journal ArticleDOI
TL;DR: In this article, two models for the friction torque calculation are compared: a Finite Element model and the analytical model proposed by Leblanc and Nelias, which assumes that full sliding occurs in the ball-raceway contact, which is demonstrated to be an appropriate simplification for many cases, but not for applications where large tilting moments are involved.

20 citations

Journal ArticleDOI
TL;DR: A new approach has been proposed for the calculation of the friction torque, which has lower computational cost in comparison to a previous approach by the authors, so more accurate results can be obtained due to refined calculations with no significant cost increase.

19 citations

Book ChapterDOI
01 Jan 2017
TL;DR: In this article, a procedure for the determination of the interferences between balls and raceways in four-contact-point slewing bearings due to manufacturing errors is proposed and applied to a particular case and finite element analyses are performed for the friction moment calculation, considering different preloads.
Abstract: This work proposes a procedure for the determination of the interferences between balls and raceways in four-contact-point slewing bearings due to manufacturing errors. The procedure is applied to a particular case and finite element analyses are performed for the friction moment calculation, considering different preloads. The results are used to evaluate the influence of manufacturing errors in the friction torque of the bearing.

7 citations

References
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Book
09 Oct 2006
TL;DR: In this paper, the authors introduce the concept of rolling bearing and apply it to a variety of applications, including industrial, national, and international standards, such as interference fitting and clearance.
Abstract: ROLLING BEARING TYPES AND APPLICATIONS Introduction to Rolling Bearings Ball Bearings Roller Bearings Linear Motion Bearings Bearings for Special Applications Closure References ROLLING BEARING MACROGEOMETRY General Ball Bearings Spherical Roller Bearings Radial Cylindrical Roller Bearings Tapered Roller Bearings Closure References INTERFERENCE FITTING AND CLEARANCE General Industrial, National, and International Standards Effect of Interference Fitting on Clearance Press Force Differential Expansion Effect of Surface Finish Closure References BEARING LOADS AND SPEEDS General Concentrated Radial Loading Concentrated Radial and Moment Loading Shaft Speeds Distributed Load Systems Closure References BALL AND ROLLER LOADS DUE TO BEARING APPLIED LOADING General Ball-Raceway Loading Symmetrical Spherical Roller-Raceway Loading Tapered and Asymmetrical Spherical Roller-Raceway and Roller-Flange Loading Cylindrical Roller-Raceway Loading Closure CONTACT STRESS AND DEFORMATION General Theory of Elasticity Surface Stresses and Deformations Subsurface Stresses Effect of Surface Shear Stress Types of Contacts Roller End-Flange Contact Stress Closure References DISTRIBUTION OF INTERNAL LOADING IN STATICALLY LOADED BEARING General Load-Deflection Relationships Bearings under Radial Load Bearings under Thrust Load Bearings under Combined Radial and Thrust Load Closure References BEARING DEFLECTION AND PRELOADING General Deflections of Bearings with Rigidly Supported Rings Preloading Limiting Ball Bearing Thrust Load Closure References PERMANENT DEFORMATION AND BEARING STATIC CAPACITY General Calculation of Permanent Deformation Static Load Rating of Bearings Static Equivalent Load Fracture of Bearing Components Permissible Static Load Closure References KINEMATIC SPEEDS, FRICTION TORQUE, AND POWER LOSS General Cage Speed Rolling Element Speed Rolling Bearing Friction Rolling Bearing Friction Torque Bearing Power Loss Thermal Speed Ratings Closure References FATIGUE LIFE: BASIC THEORY AND RATING STANDARDS General Rolling Contact Fatigue Fatigue Life Dispersion Weibull Distribution Dynamic Capacity and Life of a Rolling Contact Fatigue Life of a Rolling Bearing Load Rating Standards Effect of Variable Loading on Fatigue Life Fatigue Life of Oscillating Bearings Reliability and Fatigue Life Closure References LUBRICANTS AND LUBRICATION TECHNIQUES General Types of Lubricants Liquid Lubricants Grease Solid Lubricants Lubricant Delivery Systems Seals Closure References STRUCTURAL MATERIALS OF BEARINGS General Rolling Bearing Steels Steel Manufacture Effects of Processing Methods on Steel Components Heat Treatment of Steel Materials for Special Bearings Cage Materials Seal Materials Tribological Coatings for Bearing Components Closure References VIBRATION, NOISE, AND CONDITION MONITORING General Vibration- and Noise-Sensitive Applications The Role of Bearings in Machine Vibration Measurement of Nonroundness and Vibration Detection of Failing Bearings in Machines Condition-Based Maintenance Closure References APPENDIX INDEX

327 citations


"Effect of manufacturing errors on l..." refers background or methods in this paper

  • ...32 times the maximum contact stress.(3) With 975MPa as the shear strength and 0....

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  • ...Principal stress in Z-direction below contact point.(3) Aithal et al....

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  • ...This procedure can be easily understood by taking a simple case of single ball loaded vertically as shown in Figure 4.(3) As seen from the figure, the maximum compressive stress acts along the contact direction....

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Journal ArticleDOI
TL;DR: In this paper, a method of calculating the deformation characteristics of roller slewing bearings is presented, where the type and the parameters of the roller generator correction have the largest influence on the analysed deformation.

110 citations

Journal ArticleDOI
TL;DR: In this article, a 3D finite element (FE) simplified analysis of load distribution and contact angle variation in a slewing ball bearing is presented, which is based on the Hertz theory and models the rolling elements under compression by nonlinear traction springs between the centers of curvature of the raceways.
Abstract: Bolted bearing connections are one of the most important connections in some industrial structures, and manufacturers are always looking for a quick calculation model for a safe design. In this context, all the analytical and numerical models reduce the global study to the study of the most critical sector. Therefore, the main inputs for these models are the maximal equivalent contact load and the corresponding contact angle. Thus, a load distribution calculation model that takes all the important parameters, such as the stiffness of the supporting structure and the variation in the contact angle, into consideration is needed. This paper presents a 3D finite element (FE) simplified analysis of load distribution and contact angle variation in a slewing ball bearing. The key element of this methodology, which is based on the Hertz theory, is modeling the rolling elements under compression by nonlinear traction springs between the centers of curvature of the raceways. The contact zones are modeled by rigid shells to avoid numerical singularities. Each raceway curvature center is coupled to the corresponding contact zone by rigid shells. The main contribution of this method is not only the evaluation of the contact loads with a relatively reduced calculation time but also the variation in the contact angle from the deformed coordinates of the curvature centers. Results are presented for several loading cases: axial loading, turnover moment, and a combined loading of axial force and turnover moment. The influence of the most important parameters such as the contact angle, the stiffness of the bearings, and the supporting structure is discussed. Finally, a preliminary experimental validation is conducted on a standard ball bearing. The results presented in this paper seem encouraging. The FE study shows an important influence of several parameters and a good correlation with experimental results. Consequently, this model can be extended to other types of slewing bearings such as roller bearings. Moreover, it can be implemented in complex industrial structures such as cranes and lifting devices to determine the corresponding load distributions and contact angles and, consequently, the most critical sector.

109 citations


"Effect of manufacturing errors on l..." refers background in this paper

  • ...Kania(21) demonstrated the concept of defining a truss element to replace rollers in FE analysis slewing bearings, while Daidie et al.(23) demonstrated the evaluation of load distribution and contact angle in a slewing bearing by replacing rolling elements using nonlinear traction springs between the centres of curvature....

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  • ...Kania21 demonstrated the concept of defining a truss element to replace rollers in FE analysis slewing bearings, while Daidie et al.23 demonstrated the evaluation of load distribution and contact angle in a slewing bearing by replacing rolling elements using nonlinear traction springs between the centres of curvature....

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Journal ArticleDOI
TL;DR: In this article, a four contact-point bearing with one row of ball bearings was discussed under general load conditions (moment, axial load, and radial load) and the load distribution in two contact point rolling elements was calculated.

109 citations


"Effect of manufacturing errors on l..." refers background in this paper

  • ...Amasorrain et al.(7) studied the load distribution in four contact point slewing bearing for which they developed a calculation procedure....

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  • ...Amasorrain et al.7 studied the load distribution in four contact point slewing bearing for which they developed a calculation procedure....

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Journal ArticleDOI
TL;DR: In this article, the authors show a computation model that allows the correct choice of raceway curvature center shift in the raceway section plane with respect to the rolling element circle.

97 citations