海上风电机组支撑结构一体化设计方法

INTEGERATED DESIGN METHOD OF SUPPORTINGSTRUCTURE FOR OFFSHORE WIND TURBINE

受设计工作范围分工和责任的制约,风电机组设备厂商和风电场建设单位分别设计塔筒和导管架,这种分离式设计通过塔筒底部载荷传递并反复迭代确定结构型式及尺寸。此外,现有的海上风电机组导管架设计参考海洋石油平台等规范,忽略了海上风电机组的受力特点。上述两层原因较大程度上制约了支撑结构的力学性能,且设计迭代次数较多,并无法准确获取整体结构的动态响应。为解决上述问题,提出基于拓扑优化的导管架结构设计方法,并通过改变塔筒和导管架分界面位置,即扩大拓扑优化设计空间进一步提高结构性能。选取NREL 5 MW海上风电机组为研究对象,分别对比参考结构、拓扑优化结构和一体化设计结构的固有频率和不同极限工况下的最大变形。结果证明了所提出支撑结构一体化设计方法的有效性和优越性。

Wind turbine manufacturers and foundation designers design tower and jacket respectively,due to their distinct responsibilities.This separated design is carried out through load transfer at the bottom of the tower and its sizestructural style and dimensions are determined by repeated iterations through load transfer at the bottom of the tower.In addition,the design of offshore wind turbine jacket typically refers to offshore oil platforms and other regulations,ignoring the unique characteristics of offshore wind turbines.The above two reasons restrict the mechanical properties of the supporting structure to a large extent,which leads themore iterative processnumbers and cannot capture the dynamic responses of the overall structure.A structural design of jacket utilizing topology optimization wasis presented to address these challenges.The structural performance is further enhanced by relocating the interface between tower and jacket,hence expanding the design space.NREL 5 MW offshore wind turbine was chosen as the reference.The structural responsesnatural frequency and maximum deformation of the novel structures resulted from thereference structure,topology optimization structure and integrated design were provided.structure under different limit conditions are compared respectively.The results demonstratedprove the efficiencyeffectiveness and superiority of the proposed method of integrated design method for support structures.