海上风电机组格构式浮式基础结构优化及响应分析

Optimization and Response Analysis of Floating Truss Foundation for Offshore Wind Turbine

面对日益严峻的环境问题,优化浮式基础结构形式成为海上风电降本增效的一大途径。对一种具有双重抗摇摆机制的新型格构式浮式基础进行结构优化,通过格构式塔架不同布置形式的参数化分析,寻找最适合格构式浮式基础的系杆布置形式,同时对优化后格构式浮式基础进行水动力响应分析,验证优化方案可行性。结果表明:在格构式系杆布置方面,斜向系杆与角柱的角度不宜设置较大;减少横杆、增大斜杆截面面积能够更有效地提升结构抗侧刚度和承载能力。优化后的浮式基础受力性能优于原格构式浮式基础,大大提高了格构式浮式基础结构的经济性,同时其各自由度上固有周期均远大于典型波浪周期,具有良好的耐波性。

In the context of increasingly severe environmental problems,optimizing the form of floating foundations becomes a major way for offshore wind engineering to reduce costs and increase efficiency.This study optimized the structure of a new floating truss foundation for a wind turbine with dual anti-sway mechanisms and conducted the parametric analysis of the different layout forms of the truss structure to find the most suitable tie rod layout form for the floating truss foundation.At the same time,the hydrodynamic response analysis of the optimized floating truss foundation was carried out to verify the feasibility of the optimized scheme.The results showed that in terms of the tie rod layout of the truss,the angle between the diagonal tie rod and the corner column should not be set to a large value,and reducing the cross-sectional area of horizontal tie rods and increasing that of diagonal tie rods could more effectively improve the lateral stiffness and load-bearing capacity of the structure.After optimization,the force performance of the floating foundation is better than that of the original floating truss foundation,and the economical efficiency of floating truss foundation is enhanced greatly.Meanwhile,its natural period on each degree of freedom is much larger than the typical wave period,which indicated a good seakeeping performance.