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Delegates are invited to meet and discuss with the poster presenters in this topic directly after the session 'Advanced rotor technologies' taking place on Tuesday, 11 March 2014 at 11:15-12:45. The meet-the-authors will take place in the poster area.

Kazuhiko Yokoji Nabtesco Corporation, Japan
Co-authors:

(1) Nabtesco Corporation, Kobe, Japan

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2014 and are published here unedited

Kazuhiko Yokoji is a manager of CAE & Materials department, Technology and R&D Division.
Since joining CAE group in 2005, he has developed the structural analysis methods
for high precision reduction gear, and received
an incentive award of the Japan Society of Mechanical Engineers in 2007.
Now, he is mainly researching the dynamic analysis methods for high precision reduction gear.

Abstract

A high precision dynamic structural analysis for pitch control drive gears linked with enhanced HAWC2

Introduction

Due to frequent changes in wind velocity and turbulence, fatigue strength of the pitch control gears will be a critical issue especially for future large-scale wind turbines.
For precise estimation of the load applied to the gears, the impact load due to free play of gears should be taken into account as well as the elasticity and friction of the gear, in addition to aero-elastic load generated on the blades.
A precision dynamic structural analysis was conducted on an electromechanical rotor blade control system linked with enhanced HAWC2 simulation to address these issues.


Approach

Using the output load from the enhanced HAWC2, where free play, elasticity and friction of the gear had been taken into account by DTU,
an advanced dynamic structural analysis, the accuracy of which was previously demonstrated on various motion control components,
was conducted on electromechanical rotor blade control gears in turbines of different sizes, focusing on the contact stress of the drive gear and ring gear engagement.
Design optimization of the gear was discussed based on the results.

Main body of abstract

For higher durability and reliability of the pitch control gears, precise and practical load applied to the gears under actual wind vibration, was analyzed on electromechanical rotor blade control gears in wind turbines of different sizes.
An advanced dynamic structural simulation was conducted using the output load information from enhanced HAWC2*), where free play, friction and elasticity of the gear had been taken into account in the standard HAWC 2 by DTU.
The results clearly showed the effect of above parameters on the stress fluctuation and distribution in the gears with their dynamic motion and deformation under engagement.
Based on the results, durability and compatibility for the pitch control drive gears was compared among candidate drive gears.
This simulation technology can be applied to design optimization of the pitch control drive gears for future large-scale wind turbine to ensure higher durability, including protecting the expensive ring gear.

*) This is also under application to the conference by DTU.

Conclusion

A high precision dynamic structural analysis was conducted on pitch control drive gears using the output load from enhanced HAWC2 simulation, where the effect of free play, friction and elasticity of the drive gears were taken into account.
The results clearly showed the practical load fluctuation, which can be applied to design optimization of the pitch control drive gears to ensure higher durability, including protecting the expensive ring gear.


Learning objectives
The paper aims at:
Dynamic simulation technology of precise load and stress on the pitch control gears taking actual free play, elasticity and friction of gears into account,
with a close link between aero-elastic simulations and dynamic structural analysis.