海底缆线在敷设过程中的张力分析

发布时间：2018-04-14 12:17

本文选题：海底缆线 + 运动特性　；参考：《上海交通大学》2015年硕士论文

【摘要】：随着海洋资源的不断开发利用,海底缆线敷设技术在商业经济、军事战略等领域的关键性优势日益凸显,吸引越来越多的专家学者致力于该方面的研究。基于海洋环境的复杂性与恶劣性,尽管历经一个多世纪的发展,海底缆线敷设工程仍有很多运动和控制问题亟需解决。为确保敷设作业的安全可靠,精确的仿真模拟必不可少。通常在敷缆作业中,海底缆线除受重力、浮力、惯性力及附加质量力等荷载作用,还会受到航行速度、放缆速度、流速分布等施工条件的影响。本文主要以海底缆线为研究对象,在前人研究成果的基础上,针对海底缆线在敷设过程中的运动特性和受力情况进行理论分析,建立海底缆线张力计算模型,分析海缆张力状态。通过数值模拟,研究海缆张力与各个外界因素之间的关系,总结海缆张力计算公式,准确预测敷设过程中张力分布规律及水中位形变化趋势。本文假定海底缆线为理想柔性结构物,忽略弯曲刚度影响,考虑轴向拉伸变形。分析海缆各种作用荷载,基于受力平衡,建立海底缆线三维动力学方程。采用有限差分法对缆线进行单元离散,将偏微分控制方程转换为一组常微分运动方程。借助MATLAB程序,采用四阶龙格库塔积分进行数值积分求解。结合边界条件和初始条件,针对余量敷缆和张力敷缆两种不同的施工作业进行数值模拟。通过与前人的试验数据和已取得的研究成果进行对比分析,验证该数学模型的正确性及适用性。最后,本文针对余量敷缆作业,对海底通讯光缆在敷设过程中的运动特性进行仿真模拟,研究海底缆线在敷缆船运动状态变化时的动态响应。并结合海南联网工程项目,对海底电力电缆敷设作业进行稳态分析,详细讨论了各关键参数对缆线敷设作业的具体影响,其中包括航行速度、流速分布及海底张力,给出了规律性结论。计算结果表明:航行速度、流速分布、海底张力、缆线自重对其位形曲线影响比较显著;而海缆张力主要取决缆线自重、敷设水深和切向拖曳力系数。
[Abstract]:With the continuous development and utilization of marine resources, the key advantages of submarine cable laying technology in commercial economy, military strategy and other fields have become increasingly prominent, attracting more and more experts and scholars to devote themselves to the research in this field.Because of the complexity and evil of marine environment, despite the development of more than a century, there are still a lot of motion and control problems to be solved in submarine cable laying engineering.In order to ensure the safety and reliability of laying operation, accurate simulation is essential.In the cable laying operation, the submarine cable is affected not only by gravity, buoyancy, inertia force and additional mass force, but also by the construction conditions such as the speed of navigation, the velocity of cable release and the distribution of velocity.This paper mainly takes submarine cable as the research object, on the basis of the previous research results, carries on the theoretical analysis to the submarine cable in the laying process movement characteristic and the force situation, establishes the submarine cable tension calculation model.The tension state of submarine cable is analyzed.Through numerical simulation, the relationship between cable tension and external factors is studied, the formula of cable tension calculation is summarized, and the distribution law of tension and the changing trend of configuration in water are predicted accurately.In this paper, it is assumed that the submarine cable is an ideal flexible structure, and the influence of bending stiffness is ignored, and the axial tensile deformation is considered.The three dimensional dynamic equations of submarine cable are established based on the analysis of various loads of submarine cable.The finite difference method is used to discretize the cable line, and the partial differential control equation is transformed into a set of ordinary differential equations of motion.With the help of MATLAB program, the fourth order Runge-Kutta integral is used to solve the numerical integration.Combined with boundary conditions and initial conditions, numerical simulation is carried out for two different construction operations: residual cable laying and tension cable laying.The correctness and applicability of the mathematical model are verified by comparing and analyzing the experimental data and the research results.Finally, this paper simulates the motion characteristics of submarine optical fiber cable during the laying process, and studies the dynamic response of submarine cable when the motional state of cable laying ship changes.Combined with Hainan network project, the steady state analysis of submarine power cable laying operation is carried out, and the influence of key parameters on cable laying operation is discussed in detail, including navigation speed, velocity distribution and submarine tension.The regular conclusion is given.The results show that the navigation velocity, velocity distribution, submarine tension and cable weight have significant effects on the configuration curve, while the cable tension mainly depends on the cable weight, laying depth and tangential towing force coefficient.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P756.1

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