中文摘要：

系泊系统设计和分析是深海油气开发平台的关键问题,对于采用合成纤维系缆的绷紧式系泊系统,由于材料属性和安装、使用等因素可能造成缆绳不同程度的损伤,因此有必要研究损伤缆在复杂海况下的非线性动力特性尤其是动刚度演变规律。采用合成纤维系缆循环加载实验系统,对6 mm和8 mm的聚酯（polyester）缆绳试样进行实验研究。引入损伤度指标衡量缆绳的损伤程度,通过剪切股纱减小缆绳的有效承载面积以制造损伤,分别考察了损伤度、平均载荷、应变幅值和循环周次对缆绳动刚度的影响。通过量纲分析得到损伤缆动刚度相似准则,在此基础上分析实验数据获得考虑各主要影响因素的动刚度演变经验公式。这些工作为今后更为复杂的全尺寸损伤缆绳的动刚度研究奠定了基础。

英文摘要：

The design and analysis of mooring system are vitally important issues in deep water oil and gas exploitation of platforms.There are many factors which lead to the damage of synthetic fiber ropes more or less in the engineering applications of the new type mooring system such as the material properties,installation,mooring service,etc. Therefore,it is necessary to delve into the nonlinear dynamic properties of damaged synthetic fiber ropes used as mooring lines in complicated ocean environment,especially the evolution of dynamic stiffness. A specially designed experimental system which can exert cycling loading on mooring lines was used to perform experiments on the specimens of polyester whose diameters ranged from 6mm to 8mm. After introducing a scalar damage index parameter to account for damage,artificial,a quantifiable damage was inflicted on rope specimen by cutting yarns to reduce the effective bearing area of the rope. Then the influence of the damage index parameter,the mean load,strain amplitude and loading cycles on dynamic stiffness were studied in detail. Moreover,through analyzing these experimental data,a dynamic stiffness empirical expression that took account of these factors was proposed,which was based on the similarity criterion for the dynamic stiffness of damaged fiber ropes,derived from the dimensional analysis. These cognitions can serve as a foundation for further research into the behavior of the full-scale ropes with damage including more sophisticated conditions.