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项目的更广泛影响/商业潜力是提供一种用于将浮式结构系泊到海底的具有成本效益的锚，其应用于海上风力和波浪发电、大规模水产养殖和海岸保护。锚固/系泊系统成本可能占这些类型项目总资本成本的很大一部分，因此从该锚中获得的成本节约可能会提高整个项目的经济竞争力。多绳环锚（MRA）具有圆形对称性，允许多个系泊绳连接到单个锚上，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-因此需要减少的钢材量，更小和更少的运输船舶，以及更小的安装和处理设备。MRA还设计用于提供水平和垂直系泊缆载荷的阻力，后者对于深水开发中的拉紧系泊系统至关重要。美国沃茨的海底土壤条件变化很大，因此需要一种可在各种土壤类型中安装和发挥作用的多功能锚。该I-Corps项目基于与多线环锚（MRA）开发相关的两个研究领域的合并。第一种方法涉及风和波浪建模，以量化施加在平台上的随机时变载荷，这些载荷通过系泊缆向下传递到锚。 本研究考虑了不同的平台类型以及悬链线系泊系统和拉紧系泊系统。第二个研究领域涉及锚在承受此类荷载时的岩土性能调查。这项研究的推力包括并行的数值模拟和土工离心试验的MRA嵌入在粘土和砂土。岩土工程研究旨在量化MRA能够抵抗的最大系泊缆载荷，并确认重复载荷循环不会导致锚逐渐向上的棘轮运动，这可能会严重影响锚性能。风/波浪建模和岩土工程研究将提供超出本研究直接重点的见解和知识，并可适用于其他系泊系统和锚。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。