Structural gradient based sizing optimization of wind turbine blades with fixed outer geometry
Structural gradient based sizing optimization of wind turbine blades with fixed outer geometry
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DOI：
10.1016/j.compstruct.2018.07.031
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发表时间：
2018-11
影响因子：
6.3
通讯作者：
J. H. Sjølund;E. Lund
中科院分区：
文献类型：
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作者：
J. H. Sjølund;E. Lund
在这项工作中，73.5 m海上风力机叶片的质量最小化，同时考虑了制造约束、叶尖位移、屈曲和静强度准则，当受到由12个载荷方向组成的极端载荷包络时。基于梯度的尺寸优化从73.5 m商用风力涡轮机叶片的外部几何形状和载荷中进行了补偿，其中制造模具应该重复使用，因此外部几何形状保持不变。采用全叶片实体壳体有限元模型作为优化设计的基础。叶片被分成补丁，厚度的铺层组(具有相同材料和纤维取向的连续铺层组)被用作设计变量。在优化阶段，假设设计变量是连续的。采用序列线性规划(SLP)方法求解半解析梯度问题。在后处理阶段，对铺层进行细化，并将铺层组厚度四舍五入为一整数层。基于梯度的尺寸优化减少了质量和多个载荷方向上的有效约束，而后处理确保了可制造性。
In this work the mass of a 73.5 m offshore wind turbine blade is minimized while considering manufacturing constraints, tip displacement, buckling, and static strength criteria when subject to an extreme load envelope consisting of 12 load directions. The gradient based sizing optimization takes offset in the outer geometry and loading from a commercial 73.5 m wind turbine blade where the manufacturing mold should be re-used and hence the outer geometry is kept constant. A solid-shell finite element model of the full blade is used as basis for the optimization. The blade is divided into patches and thicknesses of ply-groups (groups of contiguous plies with the same material and fiber orientation) are used as design variables. The design variables are assumed continuous in the optimization phase. Sequential linear programming (SLP) is used to solve the problem with semi-analytical gradients. In the post-processing phase the lay-up is refined and ply-group thicknesses are rounded to a whole number of plies. The gradient based sizing optimization results in a reduced mass and many active constraints across multiple load directions while the post-processing ensures manufacturability.