Load distribution in a four contact-point slewing bearing
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.
About: This article is published in Mechanism and Machine Theory.The article was published on 2003-06-01. It has received 109 citations till now. The article focuses on the topics: Slewing bearing & Bearing (mechanical).
Citations
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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
TL;DR: Current situation of researches on wind turbine slewing bearing is summarized systematically and failure prediction, monitoring and diagnosis methods of slewing bearings for industries are reviewed and summarized, which can be potentially used for wind energy industry.
64 citations
TL;DR: In this article, a model for determination of static capacity and fatigue lifetime of large slewing bearing is presented, in which the contact load distribution along the bearing raceways is calculated on the basis of the static equilibrium between contact loads acting on the raceways, and external loads on the bearing.
55 citations
TL;DR: In this article, the catalogue capacity of a bearing, called catalogue capacity, does not take into account the real conditions of bearing work as the conditions of the future application of the bearing are unknown.
54 citations
TL;DR: In this article, an analysis of double arched ball bearing, which considers centrifugal forces and gyroscopic effects, is performed based on operating conditions of a five DOF inner ring and Coulomb friction model, the conventional bearing theory is extended from two to three or four contact points.
Abstract: An analysis of double arched ball bearing, which considers centrifugal forces and gyroscopic effects, is performed. Based on operating conditions of a five DOF inner ring and Coulomb friction model, the conventional bearing theory is extended from two to three or four-contact points. The commonly used control criterion of ball bearing by the inner or outer raceway is debatable and is known to fit with difficulty with experimental data. In addition, when more than two-contact points are involved, it becomes obsolete. The paper presents a mathematical model to describe the complex ball bearing internal kinematics under the effect of the external working conditions. Lubricant thickness is taken into account in geometrical equations and the nonlinear system of this quasistatic model is solved by a Newton-Raphson method. The model is first validated through comparisons with published data for conventional or single arched ball bearings. Results are also compared to those provided by the commercial software RBL4 . The analysis of a double arched ball bearing is finally performed and the complex motion of the ball highlighted.
53 citations
References
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