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Shock and Vibration
Volume 2016 (2016), Article ID 1037239, 10 pages
Research Article

Vibration Characteristics of Roundabout Swing of HAWT Wind Wheel

1School of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2Ministry of Education Key Laboratory of Wind Energy and Solar Energy Utilization Technology, Hohhot 010051, China

Received 13 March 2016; Revised 12 June 2016; Accepted 22 June 2016

Academic Editor: Vadim V. Silberschmidt

Copyright © 2016 Jian-long Ma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Modal testing was used to show that the roundabout swing was a natural vibration mode of the wind wheel of a horizontal-axis wind turbine (HAWT). During the vibration, the blade root was simultaneously subjected to bending and rotary shear stresses. A method for indirect testing and determination of the dynamic frequencies of the typical vibrations of the wind wheel was developed, based on the frequency-holding characteristic of each subsignal during the transmission of the multiple mixed-vibration signals. The developed method enabled simple and accurate acquisition of the dynamic frequencies without destruction of the flow and structural fields. The dynamic vibration stress of the roundabout swing was found to be significantly stronger than those of the first- and second-order flexural vibrations of the blades. By a combination of numerical simulations and tests, it was determined that the pneumatic circumferential force was the primary determinant of the roundabout swing vibration frequencies, the relationship being quadratic. The roundabout swing vibration potentially offers new explanations and analytical pathways regarding the behavior of horizontal-axis wind turbines, which have been found to be frequently involved in fatigue-damage accidents within periods shorter than their design lives.