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research-article

Analysis of Mode and Dynamic Stability for Wind Turbine Rotating Blades

[+] Author and Article Information
Jianping Zhang

College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China; Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai 200090, China
jpzhanglzu@163.com

Zhen Gong

College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
13696766267@163.com

Liang Guo

College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
guozai.1989@163.com

Helen Wu

School of Computing, Engineering and Mathematics, Western Sydney University, Sydney 2751, Australia
helen.wu@westernsydney.edu.au

1Corresponding author.

ASME doi:10.1115/1.4039717 History: Received June 22, 2017; Revised March 08, 2018

Abstract

For large-scale offshore wind turbine rotating blades (NREL 5MW), the theoretical model of fluid-structure interaction (FSI) vibration was established, and the blade load and the basic equations for modal analysis were given. Based on ANSYS Workbench platform, the blade modal characteristics at different rotating speeds were analyzed, and further research on dynamic stability was carried out. The results indicate that the FSI and the blade rotation have a great influence on modal frequencies, which increase with the rotating speed of the blade under FSI. When the frequency of the periodic wind speed is close to the first order natural frequency of the blade, the maximum flapping displacement and the maximum Mises stress both increase with time, and the vibration divergence appears. At the safe distance of 4.50m, the critical value of the blade maximum Mises stress basically presents a linear upward trend with the increase of the elasticity modulus, which can provide technical references for optimization design and safe operation of wind turbine blades.

Copyright (c) 2018 by ASME
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