基于局部密度双向聚类算法的软刚臂系泊系统动力特性研究  

Dynamic characteristics of soft yoke mooring system based on BCALoD

作　　者：罗起航 武文华[2,3] 吕柏呈 郭冲冲 LUO Qi−hang;WU Wen−hua;LŰBai−cheng;GUO Chong−chong(Offshore Oil Engineering Co.,Ltd.,Tianjin 300451,China;State Key Laboratory of Structure Analysis for Industrial Equipment,Dalian University,Dalian 116024,China;Shenzhen Research Institute of Dalian University of Technology,Shenzhen 518000,China;China National Offshore Oil Corporation Research Institute,Beijing 100028,China)

机构地区：[1]海洋石油工程股份有限公司,天津300451 [2]大连理工大学工业装备与结构分析国家重点实验室,辽宁大连116024 [3]大连理工大学深圳研究院,广东深圳518000 [4]中国海洋石油有限公司研究总院,北京100028

出　　处：《船舶力学》2025年第4期619-628,共10页Journal of Ship Mechanics

基　　金：国家重点研发计划资助项目(2021YFA1003501);自然科学基金资助项目(U1906233);山东省重点研发项目(2019JZZY010801);深圳市自由探索类基础研究项目(2021Szvup021)。

摘　　要：软刚臂单点系泊系统是浮式生产储卸油装置(FPSO)的主要系泊方式之一,在风浪等环境载荷联合作用下,系泊系统的运动状态呈现出多自由度的高聚集度和模态混叠的动力学特征。本文针对传统聚类算法无法获得表征极端工况小聚类簇特征的难点,提出一种基于局部密度双向聚类算法(BCALoD)的软刚臂系泊系统的监测数据特征提取方法,对海量数据进行压缩和动力学分析。聚类结果表明:多数据簇聚类中心与普通工况下的系泊姿态对应,但是少数据簇聚类中心不仅含有极端工况下的系泊姿态,还含有普通工况下的系泊姿态。根据原始数据提取各聚类中心的时程数据,结合软钢臂单点多体动力学模型,计算各聚类工况下水平和垂直系泊力。基于聚类后的受力分析结果表明:聚类出的普通工况和极端工况的系泊力符合预期,尤其是发现了在系泊姿态正常行为下的极端受力状态,表征出软刚臂设计考虑的不足。表明本文聚类方法具有有效地提取软刚臂系泊系统危险工况的能力,分析结果显示不仅要重视极端姿态下的受力,还要关注姿态运动耦合产生的极端力。The soft yoke mooring system is one of the main mooring methods of FPSO.The motion state of the mooring system under the combined action of wind and wave and other environmental loads shows the dynamic characteristics of high aggregation of multiple degrees of freedom and modal mixing.In this paper,in view of the traditional clustering algorithm that cannot obtain the characteristics of small clusters characterizing extreme operating conditions,a BCALoD clustering algorithm based monitoring data extraction method for soft yoke mooring systems was proposed for compression and dynamical analysis of the massive data.The clustering results show that the cluster centers of multiple data clusters correspond to the mooring attitude under normal operating conditions,but the cluster centers of relatively few data clusters contain not only the mooring attitude under extreme operating conditions but also the mooring attitude under normal operating conditions.The horizontal and vertical mooring forces were calculated for each clustering condition by extracting the time course data of each clustering center based on the original data and combining with the multibody dynamic modelling of soft yoke mooring system.The results of the force analysis based on the clustering show that the mooring forces of the clustered normal and extreme conditions are as expected,and that the extreme force states under the normal behavior of the mooring attitude are found in particular,which characterize the inadequacy of the design consideration of the soft yoke mooring system.It is shown that the clustering method in this paper has the ability to effectively extract the dangerous conditions of the soft yoke mooring system,and that it is important to pay attention not only to the forces in extreme attitudes,but also to the extreme forces generated by the coupling of attitude motion.

关 键 词：软刚臂单点系泊系统 BCALoD 数据特征 系泊姿态 多体动力学 极端工况 

分 类 号：U661.7[交通运输工程—船舶及航道工程]