深水自升式平台动力响应分析与结构优化研究

发布时间：2018-04-25 20:13

本文选题：自升式平台 + 波流耦合　；参考：《江苏科技大学》2013年硕士论文

【摘要】：近年来随着深海石油勘探的发展，海洋工程装备逐步成为研究的热点方向。研究深水自升式钻井平台，对于打破国外技术垄断形成具有自主知识产权的产品，提高我国深海石油开发能力、加快发展海洋工程产业具有重要意义。本文针对某型号桁架腿深水自升式钻井平台，重点研究了其整体静动态特性，并对自升式钻井平台进行结构优化，这对提高自升式平台的设计水平具有重要意义。本文研究的主要内容包括： 1．以有限元法的基本思想和基本概念为基础，通过时域绕射理论和柔性结构等效非线性系统方程，研究自升式平台非线性动力分析的方法。采用非线性波浪理论Stokes五阶波理论和Morison公式，研究环境载荷中波浪载荷的计算方法。 2．针对桁架腿深水自升式钻井平台，运用APDL语言建立参数化几何模型和有限元模型。通过有限元分析软件ANSYS，分别模拟风暴自存工况和正常作业工况下自升式平台的工作性能，研究其静力学特性。 3．运用Block Lanzcos法获得自升式平台的振型和固有频率，并采用Newmark逐步积分法研究平台整体在极端波浪作用下的瞬态动力响应，计算其动力分析的放大系数。通过随机振动分析，研究了在随机波浪载荷作用下，平台结构对随机载荷的动力响应，并按照Steinberg提出的基于高斯分布和Miner线性累积损伤定律区间法，进行随机疲劳寿命计算。 4．研究结构优化的理论方法：零阶方法和一阶方法。通过定义设计变量弦杆中心距、弦杆壁厚、水平杆节距和水平杆壁厚，对自升式平台尺寸和形状进行优化，得到最优化结果，改善平台结构，提高设计水平。
[Abstract]:In recent years, with the development of deep sea oil exploration, marine engineering equipment has gradually become a hot research direction. It is of great significance to study the Deepwater self lifting drilling platform to break the foreign technology monopoly to form products with independent intellectual property rights, improve our deep-sea oil development ability and speed up the development of marine engineering industry. A type of truss leg deepwater jack up drilling platform is used to study its overall static and dynamic characteristics, and to optimize the structure of the jack up drilling platform, which is of great significance for improving the design level of the jack up platform. The main contents of this paper include:
1. based on the basic ideas and basic concepts of the finite element method, the method of nonlinear dynamic analysis of the jack up platform is studied by the time domain diffraction theory and the equivalent nonlinear system equation of the flexible structure. The calculation method of the wave load in the environmental load is studied by using the nonlinear wave theory Stokes five order wave theory and the Morison formula.
2. for the truss leg deepwater jack up drilling platform, the parameterized geometric model and the finite element model are established by using the APDL language. Through the finite element analysis software ANSYS, the performance of the self lifting platform under the self storage and normal operating conditions of the storm is simulated, and the statics characteristics are studied.
3. the vibration mode and the natural frequency of the jack up platform are obtained by the Block Lanzcos method. The transient dynamic response of the platform under the action of extreme waves is studied by the Newmark stepwise integral method, and the amplification factor of the dynamic analysis is calculated. The random vibration analysis is used to study the random load of the platform structure under the random wave wave load. Dynamic response, and random fatigue life calculation based on Gauss distribution and Miner linear cumulative damage law interval method proposed by Steinberg.
4. the theoretical method of structural optimization is studied: zero order method and first order method. By defining the center distance of string bar, string wall thickness, horizontal bar pitch and horizontal bar thickness, the size and shape of the jack up platform are optimized, the optimization results are obtained, the structure of the platform is improved and the level of the design is raised.

【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TE95

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