考虑弯扭变形的风力机叶片结构优化

STRUCTURE OPTIMIZATION OF WIND TURBINE BLADE CONSIDERING BEND AND TWIST DEFORMATION

根据叶片几何形状建立叶片载荷等效模型,利用该载荷等效模型将叶素动量理论计算所得载荷等效成分布载荷的形式,同时建立叶片参数化有限元模型,将等效得到的分布载荷施加到叶片参数化有限元模型表面,并分析叶片腹板方位和铺层铺设角度对叶片变形的影响。然后结合粒子群算法与参数化有限元模型建立数学优化模型,以扭转变形为约束条件之一以限制叶片扭转发散。对某850 kW纤维增强型复合材料风力机叶片进行优化设计,优化其铺层厚度、腹板方位和铺层铺设角度。优化结果表明,在保持叶片叶尖挥舞变形和叶尖扭转变形不变的前提下,叶片质量减轻6.304%。

The load equivalent model of blade is established according to the blade geometry shape, using load equivalent model, the load calculated by the leaf momentum theory is equivalent to the form of distributed load. At the same time, the blade parameterized finite eldment model is established and the equivalent distributed load is applied to the surface of the blade parameterized finite element model. And the influence of blade web orientation and laying angle on blade deformation is analyzed. Then the mathematical optimization model is established combining particle swarm algorithm with a parametric finite element model, and taking torsion deformation as one of the constraints to limit torsion divergence of the blade. The optimal design of an 850 kW fiber-reinforcement composite wind turbine blade is carried out to optimize the ply thickness, web orientation, and laying angle. The optimization results show that in the premise of keeping blade tip wielding deformation and blade tip torsional deformation unchanged, the blade mass is reduced by 6.304%.