I-Corps: Multiline Ring Anchor for Floating Offshore Structures

I-Corps：用于海上浮动结构的多线环锚

• 批准号: 2139411
• 负责人: Charles Aubeny
• 金额: $ 5万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-15 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2139411&HistoricalAwards=false
• 关键词: Corps; Multiline; Ring; Anchor; Floating

The broader impact/commercial potential of this I-Corps project is to provide a cost-effective anchor for mooring arrays of floating structures to the seabed, with applications in offshore wind and wave power generation, large scale aquaculture, and coastal protection. Anchorage/mooring system costs can comprise a significant portion of the total capital cost for these types of projects, so cost savings derived from this anchor may improve the economic competitiveness of the overall project. The Multiline Ring Anchor (MRA) has a circular symmetry to permit multiple mooring line attachments to a single anchor, greatly reducing the number of anchors within an array of floating units. The MRA is designed for high efficiency - high load capacity relative to its size - thereby requiring decreased amounts of steel, smaller and fewer transport vessels, and smaller installation and handling equipment. The MRA is also designed to provide resistance to both horizontal and vertical mooring line loads, the latter being essential for taut mooring systems in deep-water developments. Seabed soil conditions are highly variable in U.S. waters, leading to a need for a versatile anchor that can be installed and function in a wide range of soil types.This I-Corps project is based on the merging of two research areas associated with the development of the Multiline Ring Anchor (MRA). The first involves wind and wave modeling to quantify the stochastic, time-varying loads placed on platforms that are transmitted through the mooring lines down to the anchor. This study considers different platform types and both catenary and taut mooring systems. The second research area involves investigation of the geotechnical performance of the anchor when subjected to such loading. This research thrust comprises parallel numerical simulations and geotechnical centrifuge tests of the MRA embedded in clay and sand soils. The geotechnical studies aim to quantify the maximum mooring line loads that the MRA is capable of resisting and to confirm that repeated load cycles will not induce gradual upward ratcheting movements of the anchor, which could deleteriously affect anchor performance. The wind/wave modeling and geotechnical studies will provide insights and knowledge extending beyond the direct focus of this study and can be applicable to other mooring systems and anchors.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该I-Corps项目的更广泛的影响/商业潜力是为海床提供浮动阵列的成本效益锚，并在海上风和波浪发电，大规模的水产养殖和沿海保护区中应用。锚定/系泊系统的成本可以占此类项目总资本成本的很大一部分，因此从该锚点中节省的成本可以提高整个项目的经济竞争力。多行环锚（MRA）具有圆形对称性，可允许多个系泊线附件到单个锚点，从而大大减少了浮动单元阵列内的锚数量。 MRA设计用于高效率 - 相对于其尺寸的高负载能力 - 因此需要减少钢量，较小和更少的运输容器以及较小的安装和处理设备。 MRA还旨在提供对水平和垂直系泊线载荷的阻力，后者对于深水开发中的绷紧系泊系统至关重要。在美国水域中，海底土壤条件的变化很大，导致需要在多种土壤类型中安装并运行多功能锚。此I-Corps项目基于与多行环（MRA）开发的两个研究区域的合并。第一个涉及风和波模型，以量化通过系泊线向下传输到锚的随机载荷的随机载荷。 这项研究考虑了不同的平台类型，以及链状和拉紧系泊系统。第二个研究领域涉及对锚进行这种载荷时对锚岩的岩土性能的研究。这项研究推动了嵌入粘土和砂土中的MRA的平行数值模拟和岩土离心测试。岩土工程研究旨在量化MRA能够抵抗的最大系泊线载荷，并确认重复的载荷周期不会诱导锚固的逐渐向上棘轮运动，这可能会有害影响锚固性能。风/波建模和岩土工程研究将提供洞察力和知识，这些洞察力和知识扩展到本研究的直接重点之外，并且可以适用于其他系泊系统和锚点。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响审查标准来评估通过评估来支持的。