Influence of Inertial Forces of Large Bearings Utilized in Wind Energy Assemblies

Authors: S. Barabas, F. Sarbu, B. Barabas, A. Fota

Abstract:

Main objective of this paper is to establish a link between inertial forces of the bearings used in construction of wind power plant and its behavior. Using bearings with lower inertial forces has the immediate effect of decreasing inertia rotor system, with significant results in increased energy efficiency, due to decreased friction forces between rollers and raceways. The F.E.M. analysis shows the appearance of uniform contact stress at the ends of the rollers, demonstrated the necessity of production of low mass bearings. Favorable results are expected in the economic field, by reducing material consumption and by increasing the durability of bearings. Using low mass bearings with hollow rollers instead of solid rollers has an impact on working temperature, on vibrations and noise which decrease. Implementation of types of hollow rollers of cylindrical tubular type, instead of expensive rollers with logarithmic profile, will bring significant inertial forces decrease with large benefits in behavior of wind power plant.

Keywords: Inertial forces, Von Mises stress, hollow rollers.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1108384

References:

[1] J. Morren, J. Pierik, W.H. de Haan, “Inertial response of variable speed wind turbines” Electric Power Systems Research 76-2006, pp. 980–987.
[2] Y. D. Song, B. Dhinakaran, X. Y. Bao, “Variable speed control of wind turbines using nonlinear and adaptive algorithms”, Journal of Wind Engineering and Industrial Aerodynamics 85-2000, pp. 293-308.
[3] S. Barabas, C. Serban, “Deep carburizing process for 20NiCrMo7 and 15 NiCr13 steels used in construction of large bearings elements”, Metalurgia International nr.3, vol XVI, 2011, ISSN: 1582-2214, pp. 5-9.
[4] W. Liqin, C. Li, Z. Dezhi,”Nonlinear Dynamics Behaviors of a Rotor Roller Bearing System with Radial Clearances and Waviness Considered”. Chinese Journal of Aeronautics, 2008, ISSN: 1000-9361, pp. 86-96.
[5] C.P. Bhateja, R.S. Hahn, ”A Hollow Roller Bearing for Use in Precision Machine Tools”, CIRP Annals, Man. Technology, Volume 29, Issue 1, 1980, pp. 303-307.
[6] O. Zwirlein, H. Schlicht,”Rolling contact fatigue mechanism accelerated testing versus field performance”, Rolling Contact Fatigue Testing of Bearing Steels, ASTM STP 771, 1982, pp. 358-379.
[7] H. Reusner, “The logarithmic roller profile – the key to superior performance of cylindrical and taper roller bearings”, Ball Bearing Journal 230-1987, pp. 2–10.
[8] L. Houpert, P. Leenders,”A Theoretical and Experimental Investigation Into Rolling Bearing Friction”. 4eme Congres Europeean de Tribologie France, 9-12 Sept. 1985.
[9] M. Cao, J. Xiao,”A comprehensive dynamic model of double-row spherical roller bearing—Model development and case studies on surface defects, preloads, and radial clearance”. Mechanical Systems and Signal Processing 22, 2008, pp. 467–489.
[10] G. Lundberg, A. Palmgren, “Dynamic Capacity of Rolling Bearings”, Acta Polytechnica Scandinavica. Electrical Engineering Series, vol. 1, no. 3, 1947, pp. 87-89.
[11] E. V. Zaretsky, J. V. Poplawski, S. M. Peters, “Comparison Of Life Theories For Rolling-Element Bearings”, NASA Technical Memorandum 106585 Annual Meeting of the Society of Tribologists and Lubrication Engineers, Chicago, Illinois, May 14-19, 1995, pp.5-9.
[12] M. Howell, G.T. Hahn, C.A. Rubin, D.L. McDowell, “Finite element analysis of rolling contact for nonlinear kinematic hardening bearing steel”, ASME Journal Tribology, 1995, pp. 36.
[13] MSC NASTRAN Release Guide, 2005.
[14] Wind Energy—The Facts, Technology, The European Wind Association, vol. 1, 2003, pp.43-47.