深海系泊缆的动刚度特性

针对纤维缆在交变载荷作用下存在的动刚度问题,基于集中质量法的思想建立了系缆的动张力计算模型,编制了能够有效分析系泊系统动力响应的源程序.将张力程序计算结果与商业软件计算结果进行对比,验证了算法程序的准确性,并在此基础上分析了纤维缆复杂的应力应变行为,采用统计的原理计算平均张力和张力幅值,将动刚度引入模型中探究其对系泊张力的影响.此外,分析系统在不同运动形式及环境载荷下的张力结果,研究考虑动刚度后系统参数对系泊张力的影响规律.

Analysis on Dynamic stiffness characteristic of deep sea mooring line

With the development of offshore oil and gas exploration into deep water, the length of mooring line is also increasing, the traditional anchor chain is gradually replaced by tight mooring system. In view of the dynamic stiffness problem of fiber cable under alternating load, The paper first establishes a dynamic tension calculation model of the cable based on the idea of the lumped mass method, and compiles a MATLAB source program that can effectively analyze the dynamic response of the mooring system; Furthermore, the calculation results of tension program are compared with commercial software to verify the accuracy of the algorithm program; Based on this, the complex stress-strain behavior of the fiber cable is analyzed, the average tension and tension amplitude are calculated using statistical principles, and the dynamic stiffness is introduced into the model to explore its effect on mooring tension; Finally, the tension results of mooring system under different motion forms and environmental loads are analyzed, and the main factors of dynamic stiffness affecting mooring tension are clarified.