With the development of composite materials in the field of wind power and manufacturing and other related technologies, wind power technology has been continuously improved. The blade is one of the most important structural components of the wind turbine. The rotation of the blade is caused by centrifugal force and gravity, which leads to the increase of the natural frequency. The results show that when the blade is rotated at high speed, the dynamic stiffening phenomenon has a great influence on the natural frequency of the blade,Horizontal Shaft Wind Driven Generator using 500 W small wind turbine blade as the research object. Based on NREL 5MW wind turbine impeller blades and combined with flexible multi - body dynamics theory and finite element analysis method, it is found that the effect of dynamic stiffening effect on wobble vibration frequency is more obvious than that of oscillating vibration frequency.
Horizontal Shaft Wind Driven Generator blades are currently made of composite materials. Because the composite material has the characteristics of light weight and high strength ratio, the wind turbine blade can bear the bigger aerodynamic load. Based on the Tsai-Wu strength theory, the characteristics of the laying fiber direction on the blade root, the airfoil transition region and the airfoil area strength performance were studied. The results show that the 45 ° laying fiber direction exhibits the optimal intensity in the vicinity of the geometric mutation performance. In order to improve the thickness of the first layer of the blade,Horizontal Shaft Wind Driven Generator the relative displacement of the blade is also reduced by a few sets of laying scheme. ZHAO Xu The finite element method and the laminated plate model were used to analyze the fan blades under aerostatic force, centrifugal force and gravity load. The results showed that the fiber had the highest strength, the deformation and failure factors were the smallest along the tangential pavement The worst intensity.
At present, there are few studies on the blade stiffening effect of leaf blade,Horizontal Shaft Wind Driven Generator web material and material pavement at home and abroad. Based on the leaves of the NRELPhase VI wind turbine of the United States Renewable Energy Laboratory, three different models of three different cross sections of leaves were established with different webs. The thickness of the web was used to ensure that the three models had the same weight. The feasibility of the material pavement was examined by resonance analysis of the three models using the Campbell diagram. The influence of the stiffening effect on the blade cross section and the variation of the natural frequency were studied by using the vibration modal analysis of the thickness of the web and the angle of the biaxial glass cloth in the web.
Fan blade as one of the core components of wind turbine, its performance quality directly affect the efficiency of the whole unit, the design of reasonable blade is to ensure the normal and stable operation of wind turbine is an important factor, on the other hand the cost of blade manufacturing accounted for 20% -30%, so to improve the performance of the blade to reduce the blade manufacturing costs,Horizontal Shaft Wind Driven Generator wind power technology has been an important issue in the development. This paper will summarize and evaluate the development of fan blade technology from the perspective of aerodynamic design, structural design and material of fan blades, explore the key to the development of blade technology, and analyze the future development direction.