风电预应力混凝土-钢混合塔架设计优化研究

风电预应力混凝土-钢混合塔架建设成本是结构选型的重要影响因素,该文基于改进粒子群算法与有限元方法提出一种优化方法,以2.5 MW风力机塔架为对象,取造价为目标函数,考虑上下塔段强度、刚度、稳定性、疲劳、塔顶位移以及结构自振频率等约束条件,实现了塔架截面及塔段高度优化。结果表明:风电混合塔架最不利荷载组合应取切出风速工况下水平气动力为第一可变荷载的荷载组合情况;钢塔段厚度对造价影响最大,其次为混凝土段高度与厚度;塔架的混凝土段高度约占塔架总高的75%时造价最低。

OPTIMIZATION AND ANALYSIS ON PRESTRESSED CONCRETE-STEEL HYBRID WIND TURBINE TOWER

The construction cost of hybrid wind turbine tower is one of the most important factors for structural design. In this paper,an optimization method based on the particle swarm optimization algorithm and finite element method,was proposed to minimize the cost by optimizing the segments and geometry of hybrid towers. The tower construction cost of towers of 2.5 MW wind turbine is taken as the optimal function,and the constraint conditions include strength,stiffness,stability,fatigue,overhead deformation and nature frequency. The results show that the most unfavorable combination of action effects should be the state where the first variable load is horizontal aerodynamic force in the condition of cut-out wind speed. The thickness of steel segment has the most important effect on construction cost,and the second is the height and thickness of concrete segment. Besides,the cost is lowest when the height of concrete segment occupies around 75% of the total height.