Dynamic Analysis Of Horizontal Axis Wind Turbine Fatigue Characteristics

Wind turbine blade is one of the key components to a large extent determine the wind turbine performance and life. With the wind turbine running time of the increase in the number of defects early in the design also will be exposed, a lot of fans due to vibration or fatigue damage.In this paper, the horizontal axis wind turbine blades as the main object of study, you want to find a wind turbine blade for structural dynamics analysis and fatigue life analysis methods for wind turbine blade design basis.Firstly, the basic theory of fatigue analysis and load calculation of wind turbine blades, made a brief analysis of the fatigue life estimation of the type and method, and the forces of wind machines to determine the wind turbine blade fatigue analysis method. Coupling system for wind turbine dynamic response calculation is based on momentum-blade element theory and the generalized coordinates Lagrange equation, using modal analysis established the wind wheel/cabin/tower coupled system equation of motion, and compiled using the Fortran language simulation program, respectively, the inherent characteristics of wind turbine blades and wind turbine coupling system to calculate the dynamic response analysis; for modal analysis, using the iterative method to replace the matrix method in the literature, and the two methods were compared and found that iterative method can achieve better numerical accuracy.For the calculation of wind turbine Tjareborg using GH Bladed software development analysis and calculation are the roots of the waving leaves, put them in array and torsion moments, and the forces under the root of the calculated equivalent stress of the roots, and finally under Miner linear cumulative damage criteria for the fatigue life of leaf analysis. In actual projects to estimate the life of the blade provides a good way.