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首页> 外文期刊>Ocean Engineering >Structural optimization based design of jacket type sub-structures for 10 MW offshore wind turbines
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Structural optimization based design of jacket type sub-structures for 10 MW offshore wind turbines

机译：基于结构优化的10兆瓦海上风机夹套型子结构设计

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摘要

The design of offshore support structures for wind turbines of 10 MW capacity presents a challenge due to potential resonance problems from the low rotor speeds during operation. The present work delineates the optimization based design of jacket type sub-structures at 50 m water depths for a 10 MW turbine by exploring the frequency constraint space of the sub-structure and confirming feasibility of a cost effective design away from rotor excitation. The conceptual design is made using a two-level optimization framework. The outer design problem, i.e. overall jacket dimensioning, is solved by a derivative free optimization method. The inner problem which consists of member sizing is solved using a robust and efficient Sequential Quadratic Programming method. The objective of the optimization is innovatively chosen as to minimize the fundamental natural frequency of the structure, while subject to frequency constraints, tower top displacement constraints and member ultimate stress constraints. The resulting design is modified during the process of verifying that all ultimate and fatigue limit states are met using fully coupled aero-hydro-elastic simulations. The final design is a low mass four-legged jacket that fully complies with offshore structural standard requirements for all design limit states, while not being affected by rotor excitation, thus being best suited for long operating life.
机译：由于运行过程中低转子转速可能引起共振问题，因此用于10兆瓦容量风力涡轮机的海上支撑结构的设计提出了挑战。本工作通过探索子结构的频率约束空间，并确认了除转子励磁以外的成本有效设计的可行性，描绘了基于优化设计的10 MW汽轮机在50 m水深处的夹套型子结构。使用两级优化框架进行概念设计。外部设计问题，即整体护套尺寸，通过无导数优化方法解决。使用健壮和有效的顺序二次规划方法解决了由成员大小组成的内部问题。创新性地选择了优化的目标，以使结构的基本固有频率最小化，同时受频率约束，塔顶位移约束和构件极限应力约束的影响。在使用完全耦合的空气-水-弹性模拟来验证是否满足所有极限和疲劳极限状态的过程中，会对所得的设计进行修改。最终设计是一种轻质的四足式外套，该外套完全符合海上结构标准对所有设计极限状态的要求，同时不受转子励磁的影响，因此最适合较长的使用寿命。

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