海上风电导管架基础节点疲劳分析
发布时间：2018-08-27 18:07
【摘要】：近些年以来,能源短缺逐渐成为全世界人类所面临的一个重要难题。在全球化的今天,世界各国科技在快速的发展,随之而来的是对能源需求的不断增长,常规能源供应日趋紧张,因此发展新能源与可再生能源变得尤为重要。太阳能、风能等可再生清洁能源在世界范围变得更加受重视,其中海上风电的发展尤为明显。海上风电作为一项较新的清洁能源产业,在其飞速发展的同时也产生了越来越多的实际工程问题。海上风机由上部风机与下部支撑结构组成,其下部结构由钢管通过焊接连接而成。由于其所处的复杂海洋环境,在多种极端海况与外界载荷共同作用下,其下部基础焊缝处极易产生应力集中,从而导致疲劳破坏。因此,下部基础焊缝处是基础结构设计的难点和重点。为了保证风机在其使用寿命期内能够正常运作,对其下部基础进行疲劳计算分析变得尤为重要。本文结合实际项目工程,重点分析研究了在波流耦合作用下导管架平台疲劳可靠性。首先,应用有限元软件建立导管架平台整体模型,通过编程的手段搜索波浪相位角,进行相应的波浪载荷计算,并对结构整体进行静力分析。其次对整体结构进行动力分析,应用有限元法相关原理解得关键热点的应力集中系数。然后建立局部有限元模型,求得热点应力,同时运用瞬态动力分析与S-N曲线相结合计算出管节点的疲劳寿命。
[Abstract]:In recent years, energy shortage has gradually become an important problem facing mankind all over the world. Today, with the rapid development of science and technology in the world, the growing demand for energy, the increasingly tight supply of conventional energy, so the development of new energy and renewable energy has become particularly important. As a relatively new clean energy industry, offshore wind power, with its rapid development, has produced more and more practical engineering problems. The offshore wind turbine is composed of the upper fan and the lower support structure, and its lower structure consists of the upper fan and the lower support structure. The steel pipe is welded and connected by welding. Because of the complex marine environment, under the combined action of various extreme sea conditions and external loads, the stress concentration at the weld of the lower foundation is very easy to cause fatigue damage. In this paper, the fatigue reliability of jacket platform under wave-current coupling is analyzed and studied. Firstly, the whole model of jacket platform is established by finite element software, and the wave phase angle is searched by programming. Secondly, the dynamic analysis of the whole structure is carried out, and the stress concentration factor of the key hot spot is obtained by the finite element method. Then the local finite element model is established to calculate the hot spot stress, and the pipe is calculated by the combination of the transient dynamic analysis and S-N curve. Fatigue life of joints.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM614
本文编号：2208034
[Abstract]:In recent years, energy shortage has gradually become an important problem facing mankind all over the world. Today, with the rapid development of science and technology in the world, the growing demand for energy, the increasingly tight supply of conventional energy, so the development of new energy and renewable energy has become particularly important. As a relatively new clean energy industry, offshore wind power, with its rapid development, has produced more and more practical engineering problems. The offshore wind turbine is composed of the upper fan and the lower support structure, and its lower structure consists of the upper fan and the lower support structure. The steel pipe is welded and connected by welding. Because of the complex marine environment, under the combined action of various extreme sea conditions and external loads, the stress concentration at the weld of the lower foundation is very easy to cause fatigue damage. In this paper, the fatigue reliability of jacket platform under wave-current coupling is analyzed and studied. Firstly, the whole model of jacket platform is established by finite element software, and the wave phase angle is searched by programming. Secondly, the dynamic analysis of the whole structure is carried out, and the stress concentration factor of the key hot spot is obtained by the finite element method. Then the local finite element model is established to calculate the hot spot stress, and the pipe is calculated by the combination of the transient dynamic analysis and S-N curve. Fatigue life of joints.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM614
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