锚泊系统的快速计算及其应用

发布时间：2018-07-17 01:11

【摘要】：锚泊系统用于将浮体结构物固定于水中某一位置,它适用于不同水深,对浮体结构物的正常使用有着很大影响。锚泊系统的锚绳在水底与锚固端连接,而通过连接器与浮体结构物作用。随着陆上资源的不断消耗,进行海上新资源的开发利用成为了不可避免的趋势。广阔的海洋中,不仅蕴藏着丰富的油气资源,更加有着取之不尽、不断再生的波浪能、风能等能源,而各类海洋资源与能源的开发利用都有可能涉及到使用锚泊定位的浮体结构物。随着我国对海洋资源与能源开发力度的不断加大,锚泊系统的快速计算及其应用在工程中将会有很大的使用空间。锚链受多种环境作用力影响,风、浪、流对其均有作用,该问题的研究较为复杂,所以通常对其作适当简化,并讨论简化的合理性及其应用范围。在本文中,简化的锚链受力计算过程被给出；在满足锚链使用要求的情况下,为更好地改变锚链的受力特性,一根锚链可以由性质不同的几段组成即多段锚链,分析并掌握多段悬链的锚链特性和计算其锚泊力很有必要,因此本文给出了多段锚链受力的计算步骤,并应用切比雪夫拟合锚链的受力。本文研究结果表明,切比雪夫拟合结果有着高精度,很适合用于锚链力的拟合,并且可以对不同锚链采用统一性的计算受力,本文的研究方法大大简化了锚链力计算程序的操作并减少了锚链力的计算时间。另外,本文还推导了锚泊系统力与刚体空间运动的关系函数,并将其用于相应的浮体计算模型。采用高阶边界元求解势流理论下的浮体波浪力,应用于锚泊与浮体结构系统运动数值模拟。同时给出频域模型及其时域模型,互相印证。最后论文通过一个简单算例,对模型正确性进行验证,比较频域模拟和时域模拟锚泊系统的结果差异,获得关于锚链几何非线性的影响效果。
[Abstract]:The mooring system is used to fix the floating structure in a certain position in the water. It is suitable for different water depths and has a great influence on the normal use of the floating structure. The anchor rope of the mooring system is connected to the anchoring end at the bottom of the water and acts on the floating structure through the connector. With the continuous consumption of land resources, the exploitation and utilization of new marine resources has become an inevitable trend. In the vast ocean, there are not only abundant oil and gas resources, but also inexhaustible, renewable wave energy, wind energy and other energy sources. The development and utilization of various marine resources and energy resources may involve floating structures located by mooring. With the increasing development of marine resources and energy in China, the fast calculation of mooring system and its application in engineering will have great application space. The Anchorage chain is affected by many kinds of environmental forces, wind, wave and current are all acting on it. The research on this problem is complicated, so it is usually simplified properly, and the rationality of simplification and its application range are discussed. In this paper, the simplified stress calculation process of the anchor chain is given. In order to change the stress characteristics of the anchor chain better, a single chain can be composed of several segments with different properties, that is, the multi-segment anchor chain. It is necessary to analyze and master the characteristics of multi-segment catenary and to calculate its anchoring force. Therefore, the calculation procedure of multi-segment chain force is given in this paper, and Chebyshev is used to fit the force of anchor chain. The results show that the Chebyshev fitting results have high accuracy and are suitable for the fitting of anchor chain forces, and can be used to calculate the forces of different anchor chains. The research method in this paper greatly simplifies the operation of the program and reduces the calculation time of the anchor chain force. In addition, the relation function between the force of the mooring system and the spatial motion of the rigid body is derived and applied to the corresponding floating body calculation model. The high order boundary element is used to solve the wave force of floating body under the potential flow theory, and it is applied to the numerical simulation of mooring and floating structure system. At the same time, the frequency domain model and its time domain model are given to verify each other. Finally, through a simple example, the correctness of the model is verified, and the results of frequency domain simulation and time domain simulation are compared, and the effect of geometric nonlinearity of anchor chain is obtained.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U653.2

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