STRUCTURAL ANALYSIS OF SLEWING BEARINGS FOR WIND TURBINES

J.H Kang 1 ; S.J Heo 2 ; J.H Yu 3 ; H.W Lee 4
1 Department of Aeromechanical Engineering, Jungwon University, Chungcheongbuk-do, South Korea.
2 Department of Aeromechanical Engineering, Jungwon University, Chungcheongbuk-do, South Korea.
3 Department of Aeromechanical Engineering, Jungwon University, Chungcheongbuk-do, South Korea.
4 Department of Aeromechanical Engineering, Jungwon University, Chungcheongbuk-do, South Korea.

Article Id - IJMET_11_11_002, Pages : 6-15

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Abstract

This study is a structural analysis of slewing bearings for wind turbines. The ball of a bearing delivers load while making contact with raceways of the inner and outer rings. To facilitate stress analysis of the slewing bearing, which has more balls than other types of bearing, the balls were converted into spring elements. Considering the shape of contact between balls and raceways, one, two, and three spring elements were introduced. Global finite element analysis of the bearing, with balls as spring elements, showed that the bearing experienced different degrees of deformation depending on the number of springs. Using the bearing deformation obtained from the global analysis, cut boundary constraint was applied for local contact analysis of balls and raceways. The contact stress between balls and raceways showed that more uniform stress could be achieved by increasing the number of springs

Keywords

Slewing Bearing, Contact Stress, Finite Element Analysis, Spring Element, Wind Turbine.

Share and Cite:

J.H Kang, S.J Heo, J.H Yu and H.W Lee, Structural Analysis of Slewing Bearings for Wind Turbines. International Journal of Mechanical Engineering and Technology. 11(11), 2020, pp. 6-15.

References

[1] ISO 76: 2006. Rolling bearings – Static load ratings.

[2] ISO 281: 2007. Rolling bearings – Dynamic load ratings and rating life.

[3] Zupan, S., and Prebil, I. Carrying angle and carrying capacity of a large single row ball bearing as a function of geometry parameters of the rolling contact and the supporting structure stiffness. Mech Mach Theory, 36(10), 2001, pp.1087-1103.

[4] Daidié, A., Chaib, Z., and Ghosn, A. 3D simplified finite elements analysis of load and contact angle in a slewing ball bearing. ASME J Mech Des, 130(8), 2008, pp.082601.

[5] Gao, X.H., Huang, X.D., Wang, H. and Chen, J. Modelling of ball raceway contacts in a slewing bearing with nonlinear springs. Proc Inst Mech Eng Part C, 225(4), 2011, pp.827–831.

[6] Plaza, J., Abasolo, M., Coria, I., Aguirrebeitia, J. and Ferna´ndez de Bustos I. A new finite element approach for the analysis of slewing bearings in wind turbine generators using superelement techniques. Meccanica, 50, 2015, pp.1623–1633.

[7] Schwack, F., Flory, H., Poll, G. and Stammler, M. Free contact angles in pitch bearings and their impact on contact and stress conditions. Wind Eur. SUMMIT 2016, Hamburg, 2016 pp.27-29. 

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