超大型海上风机安装作业平台结构强度分析

发布时间：2018-01-20 23:12

本文关键词： 海上风机安装作业平台结构强度桩腿强度静力分析动力响应分析　出处：《江苏科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来，为了解决日益紧缺的能源危机，发展海上风力发电已经成为各国政府非常重要的能源政策。欧洲是海上风力发电技术的领导者，海上风大浪高，风力资源非常丰富，适合海上风电项目的开展。海上风机安装作业平台是建设海上风电场的关键设备。本文以一艘第三代超大型自航自升式海上风机安装作业平台为研究对象，这是一种全新的海洋工程作业平台，集自升、自航、运输、起重等功能于一体。该平台船型宽大扁平，其上装备有大型升降桩腿、800吨重型起重机、较大的甲板集中载荷，其主体和桩腿的强度是其设计难点。本文根据DNV规范要求，对其进行了平台主体及桩腿的结构强度有限元分析。根据平台的工作要求以及总布置情况，确定了平台的功能载荷，包括恒定载荷以及可变载荷。根据DNV规范计算了平台主体以及桩腿在不同工况下所受到的风、浪、流等环境载荷。其中，风载荷及流载荷通过DNV规范所建议的公式直接计算所得，桩腿所受的波浪载荷则是基于斯托克斯五阶波理论，通过计算机软件计算所得。运用MSC.Patran软件建立了平台整体的有限元模型，选取了迁移、自升、预压、起吊、自存等典型工况，施加合理的载荷及边界条件，对平台主体进行了12种工况下的有限元分析，得到了不同工况下平台详细的应力分布以及变形情况。计算结果表明平台结构满足规范要求。迁移工况的应力水平较小，其受力情况同运输船舶相似，而在平台自升后，其应力水平显著上升，起吊时最大应力位置位于起重机所在桩腿与平台连接处，风暴自存工况下的应力水平最大，接近材料的许用应力。开展了桩腿在环境载荷作用下的研究，选取预压、起吊、自存等桩腿自升后的6种典型工况，对桩腿进行了静力分析，得出桩腿的应力分布以及变形情况；通过对桩腿施加随时间以及空间变化的波浪载荷，进行了桩腿的动力响应分析，得出了桩腿的最大应力及其位移响应曲线。将动力分析同静力分析相比较，，两者结果趋于一致，但是动力分析的结果较大，特别是位移，其受动力的影响较大。由比较分析可知，仅对桩腿进行静力分析是不够的，还须进行动力响应分析。本文计算结果及研究方法可为同类型平台开发研究提供一定的参考及借鉴作用。
[Abstract]:In recent years, in order to solve the increasingly scarce energy crisis, the development of offshore wind power generation has become a very important energy policy of governments. Europe is the leader of offshore wind power technology, the sea wind waves are high. The offshore wind turbine installation platform is the key equipment for offshore wind farm construction. This paper takes the installation platform of the third generation self-propelled self-propelled offshore fan as the research object, which is a brand-new offshore engineering operation platform, which integrates self-rising, self-navigation and transportation. Lifting and other functions in one. The platform is wide and flat, equipped with a large lifting leg of 800 tons of heavy crane, the larger deck concentrated load. The design difficulty is the strength of the main body and the pile leg. According to the requirements of DNV code, the finite element analysis of the structural strength of the platform body and the pile leg is carried out in this paper. According to the working requirements and general layout of the platform, the functional load of the platform is determined. Including constant load and variable load. According to DNV code, the wind, wave, flow and other environmental loads on the main body of the platform and the pile leg under different working conditions are calculated. The wind load and current load are calculated directly by the formula suggested by DNV Code, while the wave load on the pile leg is calculated by computer software based on Stokes' fifth order wave theory. The finite element model of the platform is established by using MSC.Patran software. The typical working conditions such as migration, self-lifting, preloading, hoisting and self-storage are selected, and reasonable load and boundary conditions are applied. The finite element analysis of the main body of the platform is carried out under 12 working conditions. The detailed stress distribution and deformation of the platform under different working conditions are obtained. The calculation results show that the platform structure meets the requirements of the code, and the stress level of the moving condition is small, and the stress situation is similar to that of the transport ship. The maximum stress position is located at the joint of the pile leg and the platform during lifting, and the stress level is the largest under the condition of storm self-storage, which is close to the allowable stress of the material. The research of pile leg under the action of environmental load is carried out. The stress distribution and deformation of pile leg are obtained by static analysis of six typical working conditions such as pre-loading, hoisting, self-saving and so on. The dynamic response of pile leg is analyzed by applying wave load with time and space. The maximum stress and displacement response curve of pile leg are obtained. The dynamic analysis is compared with static analysis. The two results tend to be consistent, but the results of dynamic analysis are larger, especially the displacement, which is greatly affected by the dynamic. From the comparative analysis, it can be seen that static analysis of the pile leg is not enough. Dynamic response analysis is also required. The results and research methods of this paper can provide some reference for the development and research of the same kind of platform.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U661.4;U674.34

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