As the single unit capacity has been increased, the length of wind turbine blade is becoming longer, and the blade vibration fatigue damage caused by impact of wind turbines has become an important issue of wind turbine security. Therefore, modal analysis and study on the impact of crack on the natural frequency of the wind turbine blade are of great significance. The finite element software ANSYS was used to establish a finite element model of a 1.5MW composite wind turbine blade, with a structure of twisted variable cross-section and hollow core in the first place of this paper. Modal analysis of the model established in this paper showed that the blade vibrates in 3 different forms, they are flap within the rotating plane, flutter vibration perpendicularity to the rotating plane and torsional vibration around the blade shaft. Among all the orders, flap and flutter vibration are predominent in low modes, while torsional vibration appears only in high modes (above the fifth order). Then blade models with cracks in the root were established to analyze the regularity of the blade natural frequencies with the crack location, depth and the variation of the angle. The results showed that: as the location of the crack changed in wingspan direction, the change of frequencies showed two basic trends: one was declining gradually; the other was decreasing and then increasing before decreasing again, and the minimum the maximum value appeared at location around 32.5% and 87.5% of the blade root respectively. As crack depth increased gradually, the frequencies reduced continuously, and compared to crack location, influence of crack depth was more prominent. For slant crack, when the crack angle, that is the angle between the crack section chord line and the foliosine plane, increased, all orders of frequencies gradually increased, indicating that the influence of the crack on the blade stiffness decreases as the angle increases.
Skip Nav Destination
ASME 2011 Power Conference collocated with JSME ICOPE 2011
July 12–14, 2011
Denver, Colorado, USA
Conference Sponsors:
- Power Division
ISBN:
978-0-7918-4460-1
PROCEEDINGS PAPER
Study on Natural Vibration Characteristics of Large Scale Composite Wind Turbine Blades Available to Purchase
Chengcheng Tan,
Chengcheng Tan
Dongfang Turbine Co., Ltd., Deyang, Sichuan, China
Search for other works by this author on:
Danmei Xie,
Danmei Xie
Wuhan University, Wuhan, Hubei, China
Search for other works by this author on:
Yangheng Xiong,
Yangheng Xiong
Wuhan University, Wuhan, Hubei, China
Search for other works by this author on:
Wangfan Li
Wangfan Li
Wuhan University, Wuhan, Hubei, China
Search for other works by this author on:
Yi Yang
Wuhan University, Wuhan, Hubei, China
Chengcheng Tan
Dongfang Turbine Co., Ltd., Deyang, Sichuan, China
Danmei Xie
Wuhan University, Wuhan, Hubei, China
Yangheng Xiong
Wuhan University, Wuhan, Hubei, China
Yang Shi
Wuhan University, Wuhan, Hubei, China
Wangfan Li
Wuhan University, Wuhan, Hubei, China
Paper No:
POWER2011-55428, pp. 569-573; 5 pages
Published Online:
February 28, 2012
Citation
Yang, Y, Tan, C, Xie, D, Xiong, Y, Shi, Y, & Li, W. "Study on Natural Vibration Characteristics of Large Scale Composite Wind Turbine Blades." Proceedings of the ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASME 2011 Power Conference, Volume 2. Denver, Colorado, USA. July 12–14, 2011. pp. 569-573. ASME. https://doi.org/10.1115/POWER2011-55428
Download citation file:
19
Views
Related Proceedings Papers
Related Articles
Parameter Sensitivities Affecting the Flutter Speed of a MW-Sized Blade
J. Sol. Energy Eng (November,2005)
Optimized Constant-Life Diagram for the Analysis of Fiberglass Composites Used in Wind Turbine Blades
J. Sol. Energy Eng (November,2005)
Alternative Composite Materials for Megawatt-Scale Wind Turbine Blades: Design Considerations and Recommended Testing
J. Sol. Energy Eng (November,2003)
Related Chapters
Introduction and Definitions
Handbook on Stiffness & Damping in Mechanical Design
Effects of Mechanical Vibration on Cultured Osteoblasts in Relation to Fracture Healing
Biomedical Applications of Vibration and Acoustics in Therapy, Bioeffect and Modeling
Three-Dimensional Solid Modeling of Large Wind Turbine Blade Based on Wilson Theory
International Conference on Mechanical Engineering and Technology (ICMET-London 2011)