静水压力作用下夹层管道屈曲性能分析

发布时间：2018-05-28 02:04

本文选题：夹层管 + 静水压力　；参考：《浙江大学》2015年硕士论文

【摘要】：近年来,人类对能源不断增长的需求极大地加快了油气资源的开采与消耗。与此同时,由于陆地和浅海石油资源的逐渐耗尽,如何从偏僻遥远、环境恶劣的地区开采运输油气成为工程师们面临的一个新的挑战。而夹层管作为一种新颖的设计理念,被用来从深水及超深水寒冷环境中运输油气资源。本文的主要目标就是研究这种新系统在高静水压力作用下的屈曲性能。在深水及超深水环境中,管道在安装和运行的过程中都将受到极大的静水压力。本文首先运用解析方法,在一系列假设的基础上,通过求解系统特征方程的最小特征值来计算夹层管在静水压力作用下弹性屈曲压力的近似值。并发现随着结构参数的变化,夹层管将出现两种不同的屈曲现象。文中还介绍了两种简化方法并对其进行误差分析。由于解析法建立在弹性变形的基础上,并未考虑材料的塑性变形,因此在实际工程的应用中将受到限制。为了提高研究精度,文中运用有限元方法建立夹层管外压作用下的数值模型,并通过算例分析来研究夹层管在高静水压力作用下的受力性能和屈曲响应。与单层管对比发现,夹层管的屈曲压力以及变形能力都得到了很大的提高,并且夹层管有着不同的特征路径。文中还通过广泛的参数分析,运用有限元方法研究了一系列结构参数对夹层管结构性能的影响,包括内外管的厚度、夹芯层的厚度与刚度、管道的钢材等级以及内部的黏结特性。参数的改变对夹层管的屈曲压力和变形能力都有很大的影响,甚至会改变系统的特征路径。此外,基于有限元分析结果,我们介绍了一个经验公式。将其计算结果与有限元分析以及模型试验结果进行对比发现,其误差较小,能提供较大的精度的屈曲压力计算值。
[Abstract]:In recent years, the increasing demand for energy has greatly accelerated the exploitation and consumption of oil and gas resources. At the same time, with the gradual depletion of land and shallow oil resources, how to extract and transport oil and gas from remote and harsh areas has become a new challenge for engineers. As a novel design concept, sandwich tube is used to transport oil and gas resources from deep water and ultra deep water cold environment. The main purpose of this paper is to study the buckling performance of this new system under high hydrostatic pressure. In the deep water and ultra deep water environment, the pipeline will be subjected to great hydrostatic pressure during installation and operation. In this paper, the analytical method is used to calculate the approximate value of elastic buckling pressure of sandwich tube under hydrostatic pressure by solving the minimum eigenvalue of the system characteristic equation on the basis of a series of assumptions. It is found that there are two different buckling phenomena in sandwich tubes with the change of structural parameters. Two simplified methods are also introduced and their errors are analyzed. Because the analytical method is based on elastic deformation and does not consider the plastic deformation of materials, it will be limited in practical engineering application. In order to improve the accuracy of the research, the finite element method is used to establish the numerical model of sandwich tube under external pressure, and the mechanical behavior and buckling response of sandwich tube under high hydrostatic pressure are studied by example analysis. Compared with the single-layer tube, the buckling pressure and deformation ability of the sandwich tube are greatly improved, and the sandwich tube has different characteristic paths. The influence of a series of structural parameters on the performance of sandwich tube is studied by using finite element method, including the thickness of inner and outer tube, the thickness and stiffness of sandwich layer. Steel grades of pipes and internal bonding properties. The change of parameters has great influence on the buckling pressure and deformation ability of sandwich tube, and even changes the characteristic path of the system. In addition, based on the results of finite element analysis, we introduce an empirical formula. Compared with the results of finite element analysis and model test, it is found that the error is small and can provide a more accurate calculation value of buckling pressure.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973.1

【参考文献】