船舶与海洋结构物纵向下水直接计算法研究

发布时间：2018-05-10 19:10

本文选题：直接计算法 + 纵向下水　；参考：《华中科技大学》2016年硕士论文

【摘要】：船舶与海洋结构物下水过程是结构物建造安装过程中较为复杂、危险的一个环节,稍有不慎,可能会造成巨大的经济损失甚至是人员伤亡。对下水过程的研究,有助于改进现有下水工艺,规避下水过程潜在的危险,校核下水过程中结构物的强度与稳定性。本文按照水线面特征将船舶与海洋结构物划分为孤立水线面和分离水线面结构物。针对这两类结构物,提出了孤立水线面结构物纵向下水静力学直接计算法、孤立水线面结构物纵向下水动力学直接计算法以及分离水线面结构物纵向下水动力学直接计算法。这三种方法统称为船舶与海洋结构物纵向下水直接计算法。船舶与海洋结构物纵向下水直接计算法基于浮性与完整稳性直接计算法和刚体动力学,采用通用商用有限元软件ABAQUS作为分析平台。直接计算法的意义在于:(1)将较为繁琐的邦戎曲线绘制,流体载荷积分等工作转化为常规的有限元建模操作;(2)将各类载荷直接施加到结构物的外表面单元上而无需作几何外形的简化近似;(3)可通过一次分析得到结构物纵向下水全过程的各个运动与力学成分。首先,将直接计算法应用在简单算例中(方形驳船下水、Wigley数值船下水、导管架常规下水),并将分析结果与解析解进行对比。在此基础上,将直接计算法应用在较为复杂的算例中(46000DWT油船下水、导管架自扶正下水),并统计各算例的分析时长。算例结果表明:直接计算法分析结果较为准确;能够处理复杂结构形式以及先进下水方式的下水问题,分析效率较高。因此,本文提出的直接计算法为船舶与海洋结构物纵向下水分析提供了一种新的手段,具有潜在的工程实用价值。
[Abstract]:The launching process of ships and marine structures is a more complex and dangerous link in the process of building and installing structures. A little carelessness may cause huge economic losses or even casualties. The research on launching process is helpful to improve the existing launching process, avoid the potential danger of launching process, and check the strength and stability of structure in launching process. In this paper, ship and ocean structure are divided into isolated waterline surface and separated waterline surface structure according to waterline features. For these two kinds of structures, the direct calculation method of longitudinal hydrostatic of isolated waterline structure, the direct calculation method of longitudinal hydrodynamics of isolated waterline structure and the direct calculation method of longitudinal hydrodynamic of isolated waterline structure are proposed. These three methods are referred to as the direct calculation method of longitudinal launching of ships and marine structures. Based on the direct calculation method of floatability and integrity stability and rigid body dynamics, the general commercial finite element software ABAQUS is used as the analysis platform. The significance of the direct calculation method is that: 1) draw the more complicated Bonjon curve. Fluid load integration and other work are transformed into the conventional finite element modeling operation: (2) applying all kinds of loads directly to the external surface element of the structure without making a simplified approximate approximation of the geometric shape) the longitudinal structure can be obtained by one analysis. The motion and mechanical composition of the whole process of downward water. First of all, the direct calculation method is applied to a simple example. (the square barge launches a Wigley numerical ship, and the jacket is normally launched, and the analytical results are compared with the analytical solution. On this basis, the direct calculation method is applied to the launch of 46000DWT oil tanker in a more complicated example, and the jacket is launched from the straightening out, and the analysis time of each example is counted. The results of numerical examples show that the direct calculation method is more accurate and can deal with the launching problem of complex structure and advanced launching mode, and the analysis efficiency is high. Therefore, the direct calculation method proposed in this paper provides a new method for the longitudinal launching analysis of ships and marine structures, and has potential engineering practical value.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U671.5

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