Long-term operation of mooring systems is one of the challenging issues of floating structures such as floating offshore wind turbines (FOWTs). For integrity assessment, fatigue and its affecting factors have generated considerable recent research interest as the occurrence of a large number of mooring chain failures at a high rate has been reported. By contrast, only few studies on the effect of nonuniform volume loss of mooring chain links due to wear can be found because of difficulties to estimate wear amounts quantitatively. Considering this issue, in this paper, validation of the quantitative interlink wear estimation method is investigated by applying to a spar-type floating structure. Firstly, the method is presented which consists of the material test, derivation of an interlink wear estimation formula with FE analysis, and calculation of mooring chain response with coupled dynamic analysis using a mass-spring model. To improve insufficient accuracy due to the mass-spring model around a clump weight and the touchdown point, the method is further modified by using a 3-D rigid-body link model. The estimation results and comparison show that the modified method distinguishing between rolling and sliding can calculate the interlink wear amount closer to the chain diameter measurements and more reasonable than the method using the conventional mass-spring model.

系泊系统的长期运行是浮式结构（例如浮式海上风力涡轮机（FOWT））的挑战性问题之一。对于完整性评估，疲劳及其影响因素引起了相当大的近期研究兴趣，因为已经报道了发生大量高速率的系泊链故障的情况。相比之下，由于难以定量估计磨损量，因此只能进行很少的关于系泊链节由于磨损造成的不均匀体积损失影响的研究。考虑到这个问题，在本文中，通过将其应用于翼梁式浮动结构，研究了定量互连磨损估计方法的有效性。首先，提出了一种方法，该方法包括材料测试，基于有限元分析的链环磨损估算公式的推导，锚链响应的计算以及质量弹簧模型的耦合动力分析。为了改善由于团块重量和着陆点附近的质量弹簧模型而导致的精度不足，该方法通过使用3-D刚体链接模型进行了进一步修改。估计结果和比较结果表明，与传统的质量弹簧模型相比，改进的区分滚动和滑动的方法可以计算出更接近链径测量值的链节磨损量，并且更合理。