Stiffness analysis of slewing bearings

Skyba, Rudolf; Hrček, Slavomír; Smetanka, Lukáš; Majchrák, Maroš

doi:10.1088/1757-899x/393/1/012060

Cited by 5 publications

(6 citation statements)

References 9 publications

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“…When the actual structural conditions do not meet the assumption of the Hertz contact theory, the accurate results cannot be obtained. Scholars [4][5][6] thus established the finite element model of the slewing bearing to study the contact between the roller and raceway of slewing bearings, and the results are more in line with the experimental results under heavy loads than the results from the Hertz theory. The contact pairs between rolling elements and raceways of the slewing bearing can reach several thousand.…”

Section: Introductionmentioning

confidence: 88%

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An Analysis Method of Carrying Capacity Accuracy of Three-Row Roller Slewing Bearing

Wang

2021

mech

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Three-row roller slewing bearings are the core components of large-scale rotating equipment. It has a large structural size and is subjected to heavy loads, which requires extremely high carrying capacity. The effect of finite element mesh size on the carrying capacity accuracy of three-row roller slewing bearing is investigated. A local finite element model is established to analyze the contact area between the roller and the raceway, which is compared with the Hertz contact theory to verify the reasonable mesh size of the finite element model. The local spring finite element model is established, and the effect of the mesh size on the offset and the declination of the upper and lower raceway is investigated; The overall finite element model of the slewing bearing is established to analyze the effect of the mesh size and the nonlinear spring stiffness on the carrying capacity accuracy. The whole circle deformation of the ring and the load distribution is investigated to determine the reasonable mesh size. This article provides a method and idea for the verification of the three-row roller slewing bearing finite element model, which is beneficial to improve the calculation accuracy of the bearing capacity of the three-row roller slewing bearing.

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Section: Introductionmentioning

confidence: 88%

“…An axial force Fa of 59,660 N and an overturning moment M of 41,7620,000 N•mm are applied to the three-row roller slewing bearing. The maximum contact load between the roller and the raceway is obtained by the following equation [8,11]: 4 ,…”

Section: Hertz Contact Theorymentioning

confidence: 99%

An Analysis Method of Carrying Capacity Accuracy of Three-Row Roller Slewing Bearing

Wang

2021

mech

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“…The design process is a known activity founded on well stated equations [2] and well recognized standards (see for example ISO standards N°76:2007 and N° 281:2007) also in the particular field of wind turbine [3]. In the frame of SHM, a digital twin of the PVB must represent correctly the transmission of loads to the elements connected taking into account the load distribution on the spheres [4], the actual contact angle [5] and the stiffness of the assembly of rolling elements and rings [6]. A detailed FEM model of this assembly requires a very large number of nodes and elements, and this can impede a quick and accurate response in real time.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Wind Turbine Pitch 4-Point Contact Bearing

Porziani

Biancolini

Brutti

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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In the field of renewable energy source, the wind power is certainly one of the most important and therefore the industrial and research community are devoting increasing attention to the design, construction, management and maintenance of wind turbines. Due to the relevance, technical, economic and social of this type of installation the correct maintenance is actually a crucial challenge. As in all mechanical engineering applications, numeric models, FEM based, are widely used during both the design step and monitoring on site. In fact, in the frame of Structural Health Monitoring (SHM), the availability of a Digital Twin is fundamental to interpret the signals coming from the sensors and to check the state of wear and the progression of any damage. In general, this numerical tool must have a good accuracy and a great rapidity of response. For this reason it is essential to develop condensed and reliable models of the main elements able to represent the real behaviour of the component without excessively increasing of computational costs. One of the most important element is the pitch variation slewing bearing, which allows the optimal wing orientation. Unfortunately, a complete numeric model of the bearing requires very large dimension and so the real time reply, necessary to SHM, is difficult. In this paper, to overcome this problem, a new simplified model is proposed to represent the array of spheres and its contact condition with the rings of the bearing. The new approach is based on the adoption of a toroid-shaped element replacing the rolling elements. To study this solution, a full-detailed model of a typical slewing bearing for pitch variation has been used to properly set up the contact model and to tune the properties, geometrical and elastic, of the equivalent toroidal body. The main feature of this approach is that, with a relatively low calculation effort, the deformation behaviour and the stress state of the elements connected to the bearing is available in an easy and accurate way. Then, the comparison in real time of the numerical results with the corresponding experimental ones from the site allows to deduce initiation and growth of a damaging process.

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“…Gargiulo gives empirical formulae for the load-stiffness and deflection-stiffness relations by assuming rigid bearing races. These formulae apply for radial and axial stiffnesses for a few bearing types [3,4].…”

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confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Hrcek,

Kohar,

Steininger

2021

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This article deals with the design of slewing rings (slewing bearings). A fully parametric, 3D virtual model of a ball slewing ring with four-point contact was created in the PTC/Creo Parametric CAD system. This model was subsequently used for finite-element analysis using Ansys/Workbench CAE software. The purpose of the FEM analysis was to determine the axial stiffness characteristics. Results of FEM analysis were experimentally verified using a test bench. At the end of the article, we present the nomograms of the deformation constant for different pitch diameters, rolling element diameters and contact angles.

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Stiffness analysis of slewing bearings

Cited by 5 publications

References 9 publications

An Analysis Method of Carrying Capacity Accuracy of Three-Row Roller Slewing Bearing

An Analysis Method of Carrying Capacity Accuracy of Three-Row Roller Slewing Bearing

Analysis of Wind Turbine Pitch 4-Point Contact Bearing

Bulletin of the Polish Academy of Sciences: Technical Sciences

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