The Method Research Of Large Wind Turbine Blades’ Fatigue Analysis And Life Prediction

This topic rely on the National Natural Science Foundation (51065026)"The DynamicCharacteristics of and life prediction of the megawatt-class wind turbine blades".The Wind turbine relies on bladed absorption the wind energy, use generator turnmechanical energy into electricity. The blades are the key components of the wind turbineused to be dependent on imports. Fatigue failure is one of the main forms of wind turbineblades damaged. Large-scale wind turbine design life is20years, bladeds cycle more than108times to work, the large-scale wind turbine impeller diameter more than70meters, so theblade fatigue loads and life prediction is very important.The main work in this paper：(1) Conversion the1.5MW wind turbine blades S818, S825and S826airfoil data intothe spatial coordinates, based on UG create three-dimensional model of the blade fatigue.(2) Use GH to dynamic simulation, select the opposite von Karma turbulence model tosimulate the fatigue conditions, and access to blade fatigue load.(3) fatigue model using the finite element analysis software, mesh and load the fatigueload to observe the easily damaged parts of the leaves. The fatigue performance of the S-Ncurve to evaluate the blade life.(4) According to the measured wind speed data, defined the composite material of thebladed, combined with the SN curve corresponding to the material cycle life and bladed loadspectrum, Application the Palmgren-Miner linear accumulated damage method calculatethe1.5MW wind turbine blade fatigue life.