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http://dx.doi.org/10.9725/kts.2021.37.2.48

Fatigue Strength Analysis of Complex Planetary Gear Train of the Pitch Drive System for Wind Turbines  

Kim, KwangMin (Technical Research Center, Woorim Machinery)
Bae, MyungHo (Aviation Maintenance, Changwon Moonsung University)
Cho, YonSang (Dept. of Mechanical Engineering, DongA University)
Publication Information
Tribology and Lubricants / v.37, no.2, 2021 , pp. 48-53 More about this Journal
Abstract
Wind energy is considered as the most competitive energy source in terms of power generation cost and efficiency. The power train of the pitch drive for a wind turbine uses a 3-stage complex planetary gear system in being developed locally. A gear train of the pitch drive consists of an electric or hydraulic motor and a planetary decelerator, which optimizes the pitch angle of the blade for wind generators in response to the change in wind speed. However, it is prone to many problems, such as excessive repair costs in case of failure. Complex planetary gears are very important parts of a pitch drive system because of strength problem. When gears are designed for the power train of a pitch drive, it is necessary to analyze the fatigue strength of gears. While calculating the specifications of the complex planetary gears along with the bending and compressive stresses of the gears, it is necessary to analyze the fatigue strength of gears to obtain an optimal design of the complex planetary gears in terms of cost and reliability. In this study, the specifications of planetary gears are calculated using a self-developed gear design program. The actual gear bending and compressive stresses of the planetary gear system were analyzed using the Lewes and Hertz equation. Additionally, the calculated specifications of the complex planetary gears were verified by evaluating the results from the Stress - No. of cycles curves of gears.
Keywords
wind turbine; pitch drive; planetary gear train; gear bending stress; gear compressive stress;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Kim, Y. J., Moon, S. M. and Cho, Y. J., "Load Distribution, Contact and Fatigue Life Analysis of Pitch Bearing for Wind Turbine", J. Korean Soc. Tribol. Lubr. Eng., Vol.29, No.1, pp.33-38, 2013, https://doi.org/10.9725/kstle.2013.29.1.033   DOI
2 Park, J. H., Park, S. S., Yoon, Y. I., Yoo, C. H. and Hwang, J. G., "Design for Yaw Brake System in Wind Turbine", J. Korean Soc. Tribol. Lubr. Eng., Vol.27, No.4, pp.204-208, 2011, https://doi.org/10.9725/kstle.2011.27.4. 204   DOI
3 Bae, T. Y., Bae, M. H., Park, J. L. and Lee, S. S., "The Bending Stress Analysis of Planetary Gears of Two Speed Reducer for Rotator System with Hybrid Function of the Piling Construction Work", Journal of the Korean Society of Creative Engineers, Vol.49, pp.25-32, April 2016.
4 Coy, J. J., D. P. Townsend and E. V. Zaretsky, "Dynamic Capacity and Surface Fatigue Life for Spur and Helical Gears", ASME Paper No.75-Lub-19, pp.56-73, 1975.
5 Satoshi, O. and Tsubokura, K., "Effects of Addendum Modification on Bending Fatigue Strength of Spur Gears"(3rd Report, Cast Iron and Cast Steel Gears), Bull. JSME, Vol.24, No.190, Paper No.190-15, pp.24-30, April 1981.
6 American Gear Manufacturers Assoc., "Rating the Pitting Resistance and Bending Strength of Spur and Helical Involute Gear Teeth", AGMA Standard 218.01, pp.14-20, 1982.
7 D.W. Dudley, The Handbook of Practical Gear Design, 2nd Edition, Mcgraw-Hill, pp.1.27-1.32, 2.1-2.12, 3.1-3.45, 3.78-3.112, 1984.
8 Bae, M. H., Jang, S. K. and Lee, S. Y., Automotive & Continuously Variable Transmission, 2nd Edition, Sun-Hak publication, pp.37-44, 2009.
9 Bae, M. H., Bae, T Y, Cho, Y. S., Son, H. Y. and Kim, D. J., "The Stress Analysis of Planetary Gear System of Mixer Reducer for Concrete Mixer Truck", Journal of Drive and Control, Vol.12, No.4, pp.77-81, December 2015.   DOI
10 Lewes, Wilfred, "Investigation of Strength of Gear Teeth", Proc. Eng. Club, Philadelphia, pp.38-55, 1893.