Numerical Study of Influence of Mutual Slewig of Roller Bearing Rings on the Principal Stresses at Contact Area (original) (raw)
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Contact pressure analysis of slewing rings
IOP Conference Series: Materials Science and Engineering
The paper deals with creation of functional parametric 3D model of slewing bearing. The slewing bearing is loaded by the radial force that acts from the centre of the bearing and it is also perpendicular to the axis of bearing. 3D fully parametric model of slewing ring was designed in Creo Parametric 3 and it is controlled by the ball diameter. To calculate several geometric bearing modifications, the 3D model from Creo was imported to the Ansys Workbench computational program. Based on many analysis in Ansys, it is possible to evaluate the size of contact pressures, determine the most loaded place and compare values between individual bearing modifications. By transferring the measured values of the contact pressures to the Microsoft office, it was possible to construct a graphical dependence between the values of measured stresses and the magnitude of the radial force acting on the slewing bearing.
Effects of Design Parameters on Static Equivalent Stress of Radial Rolling Bearings
Acta Polytechnica, 2021
The aim of this study is to theoretically investigate the effects of design parameters on the static equivalent stress of radial rolling bearings, such as the point contact case for ball bearings and line contact case for roller bearings. The contact pressure, contact area and von Misses stress of bearings are calculated based on geometrical parameters, material parameters and loading parameters by using the developed MATLAB program. To achieve this aim, both the maximum contact pressure pmax and Von Mises effective stress σVM are simulated with respect to design parameters such as varying ball and roller element diameters and varying ball and roller element elasticity modulus. For the point contact case and line contact case, it was concluded that increasing the diameter of ball and roller elements results in reducing the maximum contact pressure pmax Furthermore, increasing the elasticity modulus of the ball and roller elements results in increasing the maximum contact pressure σV...
Engineering Failure Analysis, 2013
In the presented paper a calculation procedure for determination of dynamic load capacity of large three-row roller slewing bearings is presented. The calculation procedure consists of three main parts: (i) determination of internal contact force distribution in a large threerow roller slewing bearing with consideration of bearing clearances and ring support deformations, (ii) determination of stress field in the contact area between raceway and rollers as a consequence of contact forces and (iii) determination of the bearing's fatigue life due to contact fatigue of the raceway. The internal contact force distribution is determined numerically by using a symmetry 3D FEM-model of a large three-row roller slewing bearing. Another numerical procedure is used to determine the stress field in the contact area between rollers and raceway. This problem is studied on different roller types: cylindrical roller (without profile correction), fully crowned roller (logarithmic-profile) and partially crowned roller (ZB-profile). Numerically determined contact stresses then serve as a basis for fatigue analyses, where the bearing's service life of the bearing is determined by using the stress-life approach, considering typical material parameters of the bearing's raceway.
Transstellar journal, 2018
This paper reports Contact Stress and Contact Zone Analysis of cylindrical (Roller) & Spherical (Ball) Bearings using M. F. Spotts Analytical Equation for epicycloid condition. The different combinations of ratios of its outer radius and inner radiusi.e. (R2, R1) and the elasticity of the material E1, E2 have been considered to investigate the compressive stresses (P0), and the contact zone (a) on the surfaces of the ball & Roller bearing i.e. Analytical method is applied for the analysis of both spherical and cylindrical type of Ball Bearing Cavity. The results are compared between both type of bearings and final interpretation has been made.
Finite elements method modelling of rolling bearings
2019
This study presents to determine the contact stress in rolling bearings by using analytical and numerical method. Analytical solution is obtained by using Hertizan contact theory. Obtained analytical solution by this theory require comparison with the numerical calculations to obtain more accurate results for contact problems. Because of that the same problems are also examined by using finite element method. The geometry of the model being studied gives different type of contact configurations such as a point or line of contact. In cylindrical roller bearing the contact form is line contact and for the ball bearing the contact characteristic is point contact. High stress occurs on both of these two contact areas. Contact stress causes elastic or plastic deformation and the contact area will change depending on the magnitude of the contact stress. Therefore, it is really important to calculate more accurate stress at the contact area.
3D Simplified Finite Elements Analysis of Load and Contact Angle in a Slewing Ball Bearing
Journal of Mechanical Design, 2008
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.
Numerical investigation of total deformation in roller bearing using Ansys analysis.pdf
Hilbert transform is then used to make an envelope analysis of wavelet coefficients of high scales that represent the high-frequency components. By applying Hilbert and EMD transform, faults in a roller bearing can be diagnosed and fault patterns can be identified . Theories based on a flooded inlet between an isolated pair of rollers apply also to the contacts in a complete roller bearing under light loads. However, at high speeds there is a loss of oil film thickness build-up. This condition is attributed to inlet starvation at the contact, and can be made worse when there is very little oil present in the bearing . A shock pulse meter provides a quantitative result and gives a reliable indication of when a bearing change should be scheduled. This allows plant down time to be reduced to a minimum, and unnecessary bearing changes to be avoided . It was shown that the bearing deflections with rigid rings are nearly less than 60 percent of the deflections with elastic rings . The displacement and stress distributions along the outer and inner faces of the outer and inner rings have been investigated. It may be the main cause of fatigue failures of bearings. . The results of the
Analytical and experimental study of bearing stresses developed on machine elements in contact
In this technical report the governing equations of the caustic curves used to measure concentrated loads in bodies in contact are derived and verified experimentally. The method of caustics is an experimental method for calculating high intensity stress problems such as cracks, contacts, stress concentrations etc, and it can be used alone or in conjunction with other classic analytical, numerical or experimental methods in order to obtain precise and reliable data. In many mechanical engineering applications the problem of two bodies in contact is encountered such as gears, bearings, cams, pivots, chains, splines etc, where the resulting localized contact generates high stresses leading to critical working conditions and possibly to failure of parts and structures. Therefore an improved experimental tool such as the one developed and presented in this study for the calculation of the bearing load (either concentrated or distributed) in contact problems is of big importance for the researcher and could help him to yield valuable results for the design engineer. In fact the results of this study are being used to determine the load distribution on the engaged tooth pairs of two loaded gears in mesh at various instants along the path of contact. The tests are conducted at the NTUA and the results are expected to be published soon.
Contact Force Distribution Analysis on a Single-row Four Point Contact Ball Slewing Bearing
Advances in intelligent systems research, 2015
Contact force distribution analysis is the foundation of the load-carrying capacity analysis, the drawing of static load-carrying capacity curve, designing and selecting of slewing bearings. The static model of the single-row four point contact ball slewing bearing is established and the contact force distributions are solved under different types of load. The characteristics of contact force distribution of this bearing are analyzed and the influence of bearing parameters on contact force distribution is analyzed. Results show that the characteristics of contact force distributions on raceway are different under different types of load. With the increase in the contact angle and the decrease in the groove curvature radius coefficient, the loads on raceway decrease and the load-carrying capacity of bearing increases.