Technical Briefs

Characteristic Analysis of Wind Turbine Gearbox Considering Non-Torque Loading

[+] Author and Article Information
Young-Jun Park

Senior Researcher
e-mail: yjpark77@kimm.re.kr

Geun-Ho Lee

Principal Researcher
e-mail: ghlee762@kimm.re.kr

Jin-Seop Song

Senior Researcher
e-mail: jssong@kimm.re.kr

Yong-Yun Nam

Principal Researcher
e-mail: yynam@kimm.re.kr
Department of System Reliability,
Korea Institute of Machinery & Materials,
Daejeon 305-343, Republic of Korea

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received July 20, 2012; final manuscript received January 10, 2013; published online March 22, 2013. Assoc. Editor: Qi Fan.

J. Mech. Des 135(4), 044501 (Mar 22, 2013) (8 pages) Paper No: MD-12-1366; doi: 10.1115/1.4023590 History: Received July 20, 2012; Revised January 10, 2013

In the design of wind turbine gearboxes, the most important objective is to improve the durability to guarantee a service life of more than 20 years. This work investigates how external loads caused by wind fluctuation influence both the load distribution over the gear tooth flank and the planet load sharing. A whole system model is developed to analyze a wind turbine gearbox (WTG) that consists of planetary gearsets. Two models for different design loads are employed to quantify how external loads acting on the input shaft of the WTG affect the load distribution of the gears and the load sharing among the planets under quasi-static conditions. One model considers only the torque for the design load, whereas the other model also considers non-torque loads. For two models, the results for the gear mesh misalignment, contact pattern, load distribution, and load sharing are different, and this leads to different gear safety factors. Therefore, the results indicate that it is appropriate to consider the non-torque loads in addition to the torque as the design load for a WTG, and that this is very important to accurately determine the design load that guarantee the service life of a WTG.

Copyright © 2013 by ASME
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Fig. 1

Structure of 2 MW WTG in this study

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Fig. 3

Coordinate system of design load

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Fig. 2

Model of planetary gearset

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Fig. 6

Signs of gear mesh misalignment

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Fig. 7

Variation in gear mesh misalignment of (a) LS PGS, (b) HS PGS in case II model and (c) LS PGS, (d) HS PGS in case I model

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Fig. 5

Comparison of maximum radial displacements of low-speed shaft

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Fig. 4

Comparison of system deflections

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Fig. 10

Variation of torques acting on planet pins of (a) LS PGS and (b) HS PGS in case I and II models

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Fig. 9

Contact patterns of planet-ring meshes of LS PGS in case II model

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Fig. 8

Contact patterns of sun-planet meshes of LS PGS in case II model



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