疲劳是控制海上风电基础结构安全的主要因素之一,针对海上风电全钢质新型筒型基础结构疲劳问题展开研究,基于随机波浪理论与频谱分析方法,阐述了长期海况分布下结构交变应力服从Rayleigh分布的疲劳损伤累积计算方法;借助全钢质海上风电筒型基础基于前述理论开展了疲劳损伤与寿命计算,获得筒型基础主要的疲劳破坏点集中在斜撑与圆柱体连接的位置,并基于此进行了结构局部优化,结果对比表明关键部位的几何优化可极大降低应力集中程度,减小疲劳累积损伤,同时也验证了疲劳计算结果对热点应力水平具有高敏感性。
Abstract
Fatigue is one of the major factors controlling the safety of foundation for offshore wind turbines. The fatigue research of the new all-steel bucket foundation for offshore wind turbines is carried out in this paper based on the random wave theory and spectrum analysis method, the fatigue damage accumulation calculation method that the structure alternating stress under long-term sea state obeys Rayleigh distribution is discussed. The cumulative fatigue damage and life of the all-steel bucket foundation for offshore wind turbines is calculated based on the aforementioned theory, the results indicate that the main fatigue failure points of bucket foundation centrally located in the intersection of the diagonal brace and the cylinder. According to the previous results, local geometry of the structure is optimized. Comparison of results indicates that the geometric optimization of key parts can greatly reduce the degree of stress concentration and cumulative fatigue damage. Meanwhile, it verifies that the fatigue calculation results have high sensitivity to the level of hot spot stress.
关键词
海上风电 /
频谱分析 /
疲劳损伤 /
筒型基础 /
几何优化
Key words
offshore wind turbines /
spectrum analysis /
fatigue damage /
bucket foundation /
geometry optimization
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