| Wind power technology is complex. The wind wheel is an important component ofwind turbines including blades and wheels. The blades main function is to accept thewind energy. The aerodynamic performance of the blade is directly affected by the twistangle of the blade and the airfoil parameters. Further can also affect the output power ofthe rotor. Besides, the strength of the blade structure, fatigue, vibration and costs aredirectly affected blade structure, materials and processes. Therefore, the well-designedblade is required to have better aerodynamic performance and manufacturing process toensure the stable operation of wind turbine and high power output. However, it is wellknown that the vibration phenomenon is often encountered in engineering structures.Wind turbine, without exception, is often suffered from different vibrations. Because ofthe resonance，the serious failure mode of the wind turbine blade is wear fracture.To avoid blade resonant, we need to study the dynamic characteristics of the blade.This thesis is based on a realistic wind turbine blade (NPS-100) for model analysis oflarge wind turbine blades, manufactured from fiber reinforced laminated compositematerials. Firstly, the aerodynamic characteristics of wind turbine, the structuralcharacteristics and mechanical properties of the composite have been introduced.Secondly, both the geometric model and finite element model has been established inthe ANSYS. Additionally, the structure of the composite’s layer has been simulate inSHELL99element. Finally, the dynamic characteristics of the large wind turbine bladesof composite have been analyzed and the vibrational frequencies of the NPS-100’s bladehave been calculated. And the conclusion of this thesis has been compared with theformers. This thesis lays a strong foundation for the resonance and the structureoptimization design of the large wind turbine blade of the composite. |
