| As the world energy crisis and environmental problems more and more get the attentionof the world, new energy has become a hot issue of research. Wind energy as a clean energy,its development prospect is significant, with the development of wind power industry, moreand more wind power rating of the unit, which makes the wind turbine blades also towardshigh-speed, heavy-load and lightweight development rapidly. Rising of blade requirementsmake the length of the blade is more and more big, the work of the basic parameters ofdemand is more and more high. How to through optimize the blade structure and compositematerial has become the main direction of research. Meanwhile, the main form of blade,sdamage is fatigue damage, it is particularly important to predict the fatigue life.In this study, on the blade momentum theory and blade tip loss model, the hub lossmodel, the wake model as the foundation, in Sweden FFA-W3airfoil as basic externalairfoils, using FAST software basic parameters of blade are calculated, to comply with thematerial leaves of each structure layer solution were studied, and analyses the structurecharacteristics of composite blade.Then, the modeling method of composite blade finite element analysis model, calculatedusing the front blade parameters, to establish the numerical simulation model of compositeblade and finite element analysis. Established in the ANSYS workbench platform three bladeof fluid-solid coupling analysis field of the wind turbine, blade in wind field simulation isdiscussed under the non-uniformly distributed load dynamic characteristics.Finally, S-N fatigue curve blade material and the Palmgren-miner linear cumulativedamage criterion are based, by using the method of stochastic finite element analysis and thereliability, to analyze Failure mechanism and fatigue characteristics of blade. |
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