Development of Simplified Wear Estimation Method Considering Rolling Motion Between Mooring Chain Links for Floating Structures

Takaaki Takeuchi, T. Utsunomiya, K. Gotoh, I. Sato
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Abstract

For the development of floating offshore wind turbines (FOWTs) in Japan, reliability assessment and cost reduction by efficient maintenance on mooring chains are part of the key issues because sites deeper than 60 m require mooring systems for station keeping. In this paper, attempts have been made to simplify the wear estimation method which was previously proposed by using a 3-D rigid-body link model for improvement of accuracy. These investigations are performed about a spar-type floating structure moored with three catenary lines at Goto, Nagasaki prefecture, Japan. In the previous study, it was confirmed that the estimation method using the 3-D link model can calculate the interlink wear amount closer to the chain diameter measurements and more reasonable than the method using the conventional mass-spring model by removing the rolling distance from the displacement of contact points. However, the estimation method has technical difficulty in terms of calculation of contact properties and analysis costs for the mooring chain design. For this reason, the wear estimation method is simplified and verified by considering the rolling motion between mooring chain links modeled by the widely employed mass-spring model based on the method proposed by Mooring Integrity JIP. Firstly, the wear due to the rolling is reproduced by a three-dimensional FE analysis to investigate the actual wear phenomenon including the effect of the proof load test as well as the idealized configuration. Secondly, the application method is proposed against the response of the mooring chain subjected to irregular waves Finally, a comparison with the measurement is conducted to verify the proposed wear estimation method.
考虑浮式结构锚链间滚动运动的简化磨损估算方法的发展
对于日本浮式海上风力涡轮机(FOWTs)的发展,可靠性评估和通过有效维护系泊链来降低成本是关键问题的一部分,因为深度超过60米的站点需要系泊系统来保持站点。本文尝试采用三维刚体连杆模型对原有的磨损估计方法进行简化,以提高精度。这些调查是在日本长崎县后藤市对一个用三条悬链线系泊的桅杆式浮式结构进行的。在之前的研究中,通过去除接触点位移的滚动距离,证实了采用三维连杆模型的估计方法比采用传统质量-弹簧模型的方法更接近于链条直径测量值,且更合理。然而,该方法在接触特性计算和锚链设计分析成本方面存在技术难点。为此,基于系泊完整性JIP提出的方法,考虑广泛应用的质量-弹簧模型建模的系泊链间滚动运动,对磨损估计方法进行了简化和验证。首先,通过三维有限元分析再现滚动引起的磨损,以研究实际磨损现象,包括证明载荷试验的影响以及理想配置。其次,针对系泊链在不规则波浪作用下的响应提出了应用方法,最后与实测结果进行了对比,验证了所提出的磨损估计方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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