| This work was financially supported by the Ningxia Hui Autonomous Region Scientific and Technological project (413-0189).High-power grid-connected wind turbine is the best economic way of cosmically wind power energy utilization. As the mainstream model, the horizontal axis wind turbine mainly consists of blades, hub, nacelle, generator, tower and so on. In the wind energy conversion system, the wind rotor which is made up of blades and hub is wind energy capture mechanism. In this process, the wind energy is transformed into mechanical energy. And, blades are the main load bearing components, which play a key role in the normal operation of wind turbine. So it’s necessary to predict fatigue life.Firstly, by consulting domestic and overseas literatures about fatigue life of wind turbine blade, a technical route for the prediction of blade fatigue life is summed up. Thus it makes a good preparation to improve the method of life prediction.Secondly, based on the Weibull distribution function, the length of time of wind speed distribution can be calculated, one year’s number of operation cycle of blade is got. By using GH Bladed software to set up wind turbine model, selecting wind turbulence’s kind, simulating work loads, blade loads are analized. Thus it makes a good preparation for life prediction.Thirdly, based on some literatures of blade 3D modeling, the modeling process is improved and the 3D model of the blade is set up in ANSYS directly. Analyse blade fatigue based on ANSYS, and predict the fatigue life. So one way to predict fatigue life is completed.Finally, try another way to predict fatigue life. Applying Palmgren-Miner linear accumulated damage method, matching a multiplication curve of wind speed and stress, fatigue life formula is deduced. By using the computing function of MATLAB, blade fatigue life is worked out.In conclusion, the fatigue life predicted by ANSYS and Miner is reasonable, satisfying the blade 20 years work life. |
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