摘要:发电机是一种将其他形式的能量转换为电能的机械设备，素有海洋平台“心脏”之称，其重要性不言而喻。然而，海上作业环境恶劣，船舶和海洋平台在海上长期受风浪流的作用，颠簸不停，给主发电机的正常运转带来了很多隐患。基座虽是一个很小的部件，但却起着固定设备，承受和减轻设备自身重量及振动力的作用。因此，对于主发电机的基座应提出更高要求，强度、稳性、设计样式、焊接方法等都是应该考虑的因素，需要不断地进行完善。

本文研究的是主发电机基座设计及强度校核，首先搜集了自升式海洋平台及主发电机基座相关资料，了解了主发电机基座在设计过程中的注意要点以及ABS规范对于基座设计的规定，此外，对于本次设计校核过程中所运用到的绘图软件CAD和有限元分析软件Femap也进行了学习，运用CAD将基座模型绘出，并由Femap建模进行强度校核分析。

关键词:NG-2500自升式海洋平台、主发电机基座、CAD、Femap、强度校核

Abstract:Generator, one mechanical equipment which converts other forms of energy into electric energy, is known as the “heart” of offshore platform and its importance is self-evident. However, offshore operating environment can be adverse. Ships and offshore platforms have long been subjected to wind, wave and current at sea, leading to constant jolt that may bring about many hidden troubles to the normal operation of the main generator. Though foundation is a small component, it plays the role of fixing the equipment, bearing and reducing its own weight and vibration force. Thus, higher requirements should be put forward for main generator foundation . The following factors should all be taken into consideration and need continuous improvement: intensity, stability, design pattern, welding method, etc.

This paper studies the design of main generator foundation and intensity checking. First, the author has collected the relevant data of jack-up platform  and main generator foundation, known the key points in its design process and ABS specification for it. Besides, he has also learned drawing software CAD and finite element analysis software Femap that are applied to this design and checking process. He has drawn the foundation model with CAD and modelled with Femap to analyze intensity checking.

Keywords:NG - 2500 Self - propelled Jack-up、Main generator foundation、CAD、 Femap  、Strength Check

目 录

第一章绪论 1

1.1研究目的及意义 1

1.2研究现状 1

1.2.1自升式海洋平台 2

1.2.2NG-2500自升式海洋平台简介 3

1.2.3主发电机基座研究 5

1.3本文研究内容 5

第二章相关软件及理论介绍 6

2.1软件介绍 6

2.1.1CAD简介 6

2.1.2Femap简介 6

2.2有限元法 7

2.2.1有限元法定义 7

2.2.2有限元法原理 7

2.2.3有限元法优点 7

2.2.4有限元法求解问题基本步骤 8

第三章主发电机基座设计 10

3.1基座概述 10

3.1.1基座简介