Quantitative Wear Estimation for Floating Structures by Using 3-D Geometry of Mooring Chain
Quantitative Wear Estimation for Floating Structures by Using 3-D Geometry of Mooring Chain
复制标题
利用系泊链的 3D 几何形状定量估计浮动结构的磨损
DOI：
10.1115/omae2020-18409
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Sato Iku
中科院分区：
文献类型：
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作者：
Takeuchi Takaaki;Utsunomiya Tomoaki;Gotoh Koji;Sato Iku
为降低海上漂浮式涡轮机结构的维护成本，有必要建立一种定量的系泊链磨损评估方法。在本文中，已作出尝试，以提高精度的估计方法的系泊链模型。这些研究是针对日本长崎县后藤的一个采用三条悬链线系泊的Spar型浮式平台进行的，目前，系泊链的响应分析采用质量弹簧模型，两条弹簧线之间的相对角度仅被认为是没有摩擦的滑动角。然而，在系泊链之间的运动中也存在滚动，这应该比滑动引起的磨损小。在这项研究中，在响应分析中的详细运动的链接计算和应用到磨损估计使用的3-D模型在MSC。亚当斯。这使得考虑到链节运动的磨损估计更接近于真实的现象。三维链模型之间的接触分析需要某些接触特性（例如接触刚度和摩擦）。本文基于赫兹接触法和有限元分析计算了这些特性，结果表明，以往研究中采用质量-弹簧模型高估的磨损量，特别是配重点和触地点处的磨损量，随着接近测量值而减小。此外，通过对接触点的跟踪发现，连杆之间的运动主要是滚动。对于未来的工作，仍然需要进一步验证和考虑系泊链之间的弹性、验证载荷试验引起的压痕和腐蚀的影响。
For reducing the maintenance cost of floating offshore wind turbine structures, it is necessary to establish a quantitative wear estimation method for the mooring chains. In this paper, attempts have been made to improve the accuracy of the estimation method in terms of the mooring chain model. These investigations were performed about a spar-type floater moored with three catenary mooring lines at Goto, Nagasaki prefecture, Japan.Up to now, the mass-spring model had been used for the mooring chain in response analysis and the relative angle between two spring lines was considered as only a sliding angle without friction. However, there is also rolling in the motion between mooring links, which should cause less wear than by sliding. In this study, the detailed motion of the link in response analysis is calculated and applied to the wear estimation by using a 3-D model in MSC. Adams. This enables the wear estimation considering link motion closer to a real phenomenon. A Contact analysis between the 3-D chain model requires some contact properties (e.g. contact stiffness and friction). In this paper, these properties are calculated based on the Hertzian contact method and FEM analysis.As a result, the wear amounts overestimated by using the mass-spring model in the previous investigation, especially at the point located clump weight and touchdown point, decrease getting closer to the measurements. In addition, by tracking the contact points it is found that the major motion caused between links is the rolling. For future works, there remains a need for further validation and the consideration of elasticity between mooring links, impressions caused by proof load test and the effect of corrosion.