基于拓扑优化的海上风电机组三脚架结构设计

STRUCTURAL DESIGN ON TRIPOD STRUCTURE OF OFFSHORE WIND TURBINE BASED ON TOPOLOGY OPTIMIZATION METHOD

为实现海上风电机组支撑结构的轻量化设计,提出基于拓扑优化的海上风电机组三脚架结构设计方法。首先,以结构柔顺度最小化为目标设置体积比约束,基于变密度法实现三脚架结构的概念设计;然后,以拓扑优化结果为依据,通过删除参考结构的水平连杆及增加斜支撑与中心主筒厚度的方式实现三脚架结构的重构;最后,从固有频率、极限强度及疲劳强度3个方面验证优化结构的可靠性及有效性。结果表明:与参考结构相比,优化结构在满足静动态和疲劳设计要求的同时实现了结构大幅减重,充分证明了所提拓扑优化方法的可行性及优越性。

To achieve the lightweight design of the offshore wind turbine(OWT)supporting structures,a topology optimization method for the OWT tripod structure is proposed.Firstly,the optimization problem with the minimum compliance subject to volume fraction is established.The concept design of the tripod structure is performed based on variable density method.Then based on topology optimization results,the tripod structure is reconstructed by deleting the horizontal connecting rod of the reference structure and increasing the thickness of inclined support and central main barrel.Finally,the reliability and effectiveness of the optimized structure are verified from three aspects including the natural frequency,ultimate strength and fatigue strength.The results show that compared with the reference structure,the optimized structure can greatly reduce the total weight of the whole structure while meeting the static,dynamic and fatigue design requirements,which fully proves the feasibility and superiority of the proposed topology optimization method.