深水非线性弹簧截断张紧式系泊系统动力特性  

Dynamic characteristics of deepwater truncated taut mooring system with nonlinear springs

作　　者：王宏伟[1] 罗勇[1] 马刚[1] 孙丽萍[1] 

机构地区：[1]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150001

出　　处：《华中科技大学学报（自然科学版）》2015年第7期124-128,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：高等学校学科创新引智计划资助项目(B07019);高等学校博士学科点专项科研基金资助项目(20132304120008);中央高校基本科研业务费专项资金资助项目(HEUCFD1402;HEUCFD1424)

摘　　要：通过分析张紧式系泊系统的力学特性,提出用弹簧系统代替被截断系泊线并准确模拟其刚度特性的方法.截断水深以上系泊线刚度保持不变,讨论弹簧长度、位置及非线性系数的确定方法,保证截断前后系统的静力特性相似.提出改变截断后系泊线直径和单位长度质量的计算方法,准确模拟系泊线的动力特性.将一作业水深3 048m的FPSO内转塔式系泊系统分别等效截断到1 000m和500m,通过静态分析和时域动态分析可知:截断前后系泊线的预张力、顶部张角、静力特性曲线、平台总体响应和系泊线受力都符合良好,证明了所提截断方案的合理性和正确性.Through analysis of mechanical characteristics of taut mooring system,the springs were proposed to substitute the truncated lines and simulate their stiffness property,the stiffness of the upper lines above truncation points were invariant,the method to determine the length and position of the springs and the nonlinear coefficients were discussed,then the static similarity was guaranteed.The computing method to change the diameter and mass per length of lines were put forward to simulate the dynamic characteristics accurately.A internal turret moored FPSO in 3 048 mwater was truncated to 1 000 mand 500mrespectively,and after the static analysis and dynamic analysis in time domain,the pretension and top angle of lines,curves of static characteristics,global response,mooring tensions were all found to agree well with each other between truncated and un-truncated system,which proved the robustness and reliability of the proposed truncation method.

关 键 词：张紧式系泊 等效截断 非线性弹簧 静力 动力 

分 类 号：U674.38[交通运输工程—船舶及航道工程]