Wind Turbine Blade Structure Analysis And Optimization Design Based On Parametric Modeling

The influence of energy crisis is more serious for human in recent years, therenewable energy develops rapidly. Wind power as a kind of renewable green energyhas swept the world, all the countries in the world pay great attention to using windpower as the breakthrough of lacking energy. China, as one of the largest country ofenergy consumption, the government great supports the development of wind powerindustry, but the developing of Chinese wind power is later and the key technology ofwind power always is treated as the enterprise highest secret in foreign country, so windpower of china lags behind the developed countries greatly, large-scale wind powerequipment, especially the wind turbine blade rely on import mainly. The wind turbineblade captures wind energy directly, good aerodynamic performance, high qualityguaranteeing keep the wind turbine blade work steadily. Therefore, in this paper, theresearch topic is presented named wind turbine blade structure analysis andoptimization design based on parametric modeling. According to one existing windturbine blade, the aerodynamic performance, structure analysis and optimization designare researched deeply, obtaining the following result:①The aerodynamic load model of wind turbine blade is built on evvh momentumtheory, considering the effect of blade tip loss correction model to confirm the axial andtangential induction factors accurately. On account of GL2010, analyzing the variousloads influence for wind turbine, such as: gravitational load, centrifugal force load andaerodynamic load, the design conditions and load conditions are researched, the wholewind turbine model is built, it contains blade, airfoil, rotor, tower, power chain, cabinand control, the section loads of every working condition are calculated, and selectingthe extreme working conditions which contain the largest section loads, so the extremeloads of every blade section can be obtained, which lays a foundation for structureanalyze and optimization.②On the basis of exploring the blade structure and layer comprehensively, thepaper presents chord length, twist and relate thick are integrated expressed,three-dimensional blade shape parameter expression can calculate the three-dimensionalcoordinates, blade parameterized geometric model is built from bottom to top bycombining MATLAB and ANSYS secondary development, the full blade finite elementmechanics model is established according to the layer material and layer style, the blade quality and gravity position are calculated and compare with the experiment result toverify the reliability of the model.③The lower natural frequency and vibration mode of blade is obtained by modalanalyzing, which is close to experiment result, and analyzing the resonancephenomenon in normal operation condition. Due to the blade is made from compositematerials which show anisotropic, the blade main contains this key parts which are wingsurface, hub, main girder and web, different parts is different material and laying way,so when checking blade intensity, it should check above parts according to need. Bladestiffness is particularly important, it shows if crash the tower when blade bears force totransform, it satisfies the requirement through analyzing.④raises material thickness, blade structure parameter as optimization variables,blade quality as optimization goal to build the mathematic model of blade structureoptimization when guaranteeing blade intensity and tip displacement, combiningMATLAB and ANSYS to programme, using improved particle swarm algorithm tosearch the result of optimization, the blade which satisfies the demand and the quality islight through several iterations. The research has realistic guiding significance for thestructure of blade to optimize and remake, it provides possibility for integrated designof blade about pneumatic and structure.