针对漂浮式风力机低成本、轻量化、规模化开发的需求,提出一种基于筒型基础气浮特性的张紧式系泊漂浮式风力机基础形式,基础的系泊受力特性和内部压力变化直接关系到结构的安全性和稳定性。通过开展四角筒型基础张紧式系泊的小比尺波浪模型试验,分析预张力、水深吃水比和锚固距离对结构系缆张力和筒内压力变化响应幅值算子（RAO）的变化规律。研究结果表明：系缆张力和筒内气压的变化呈现类似变化规律,即前缆的系缆张力RAO变化小于后缆;随着预张力的增加,吃水增大,系缆张力RAO整体呈先减小后增大的趋势;该结构水深吃水比过小会导致结构的系缆张力增大,结构在水深较大时受力性能优异;慢漂作用占主导地位时,可在一定程度上增大结构的锚固距离,改善结构的系泊受力特性。
Abstract
Addressing the requirements for low-cost, lightweight, and large-scale development of floating offshore wind turbines （FOWTs）, a taut-moored FOWT foundation form based on the air-floatation characteristics of tetrapod bucket foundations is proposed. The mooring force characteristics and internal pressure variations of the foundation are directly related to the structural safety and stability. This paper presents an analysis of the effects of pre-tension, water depth-to-draft ratio, and anchoring distance on the response amplitude operator （RAO） of mooring line tension and internal pressure variations within the foundation through small-scale wave model tests of tetrapod bucket foundations with taut mooring. The research findings indicate that the changes in mooring line tension and internal air pressure exhibit similar patterns, with the RAO of the front mooring line tension showing smaller variations compared to the rear lines. As pre-tension increases and draft deepens, the RAO of mooring line tension initially decreases and then increases. A excessively small water depth-to-draft ratio for this structure leads to increased mooring line tension, whereas the structural performance is superior in deeper waters. When slow-drift motions dominate, increasing the anchoring distance to a certain extent can improve the mooring force characteristics of the structure.
关键词
海上风力机 /
筒型基础 /
张紧式系泊 /
受力特性 /
预张力 /
水深吃水比 /
锚固距离
Key words
offshore wind turbines /
bucket foundation /
taut mooring /
force characteristics /
pre-tension /
depth-to-draft ratio /
anchoring distance
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基金
国家自然科学基金（52171274）; 重庆市教委科学技术研究项目（KJQN202200740）; 重庆市自然科学基金（Cstc2021jcyj-msxmX0658）; 2024重庆市研究生科研创新项目（CYS240467）
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