海上风电机组多导管架拓扑优化方法

TOPOLOGY OPTIMIZATION METHODOLOGY ON MULTI-JACKET STRUCTURE FOR OFFSHORE WIND TURBINE

为实现海上风电机组多导管架结构概念设计,对某型5 MW多导管架结构进行模态分析、整机载荷计算与极限工况下的刚强度分析。根据受力特点,建立多导管架结构的多目标拓扑优化模型,通过最小尺寸约束抑制棋盘格现象并设置对称面约束,得到不同权因子下的拓扑优化结果。基于某一加权因子下拓扑优化结果,重新建立新型多导管架有限元模型,并进行载荷重分析。通过极限工况下的静动态分析结果对比可知,优化结构一阶固有频率略有提高,最大变形和应力均大幅降低。上述结果证明了提出的拓扑优化流程在海上风电机组多导管架设计中的可行性和优越性。

To realize the conceptual design of multi-jacket structure for offshore wind turbine(OWT),modal analysis,load calculation,stiffness and strength study of in extreme working conditions were conducted for a 5 MW multi-jacket structure were conducted..Based on its mechanical behavior,a multi-objective topology optimization(TO)formulationmodel for multi-jacket structure was proposed,by suppressing checkerboard patterns by imposing a minimum size restriction and adopting plane symmetry constraints.Thus the TO results by varying weighted with different weight factors were obtained.In terms of topological configuration under a specified weighted factor,the finite element model of a novel multi-jacket structure was providedre-established and load calculation was reanalyzed.By comparing the static and dynamic analysis results under ultimate loading cases,it can be observed that the first-order natural frequency of the optimized structure is slightly enhanced.Simultaneously,the maximum deformation and stress wereare greatly reduced.These results clearly confirmedconfirm the viability and superiority of the suggested TO procedure in the multi-jacket design of OWTs.