论文总字数：18022字

摘 要

现代港口建设不仅要求前期规划施工满足一系列工程经济条件，更要求港口后期运营中尽可能绿色环保及可持续发展。本文以港口靠港船舶典型结构的振动和声辐射为研究背景，探究用有限元方式模拟振动和声辐射的传播效应，对于达到节能减排，满足港口安全生产和发展的需要有着极其重要的意义。本论文使用有限元-边界元法进行建模分析，相对于其他一些结构分析的算法，本论文所采用的方法具有需要建模的规模较小、计算得出的结果精度较好及计算所耗时间较短等比较优势现有有限元研究主要基于圆柱壳体在无限大流场条件为背景分析，本文以半圆柱结构壳体在有限大立方体水域中模态分析为背景，探讨港池环境下船舶典型结构的振动和声辐射特性，本论文在最初讨论利用典型壳体结构代替具象化船舶结构的可能性，探讨研究结构所需要采样的频率段。船舶靠港过程中，随着靠港距离的接近，与岸壁的距离也越来越近，

因此，本文的重点是探究刚性壁面与典型船舶结构的距离对结构振动和声辐射所造成的影响，研究结果表明：由于结构与壁面距离接近，从而导致结构振动和声辐射强度发生变化，对于典型船舶结构靠港过程中的振动和声辐射研究有着指导意义。

本文的特点主要在于采用了完全浸没式的带肋板半圆柱壳体进行研究，区别于传统圆柱壳体研究，更能反映真实船舶结构特点。

关键词：船舶典型结构 有限大立方体水域 离岸距离 振动与声辐射

Abstract

Modern port construction not only requires that the preliminary planning and construction meet a series of engineering economic conditions, but also requires that the port operation in the later period be as green and sustainable as possible. Based on the research background of the vibration and sound radiation of the typical ship structure near the port, this paper studies the propagation effect of the vibration and sound radiation simulated by the finite element method, which is of great significance to achieve energy conservation and emission reduction, and meet the needs of the safe production and development of the port. The existing finite element research is mainly based on the background analysis of the cylindrical shell in the infinite flow field. In this paper, the vibration and sound radiation characteristics of the typical ship structure in the harbor basin environment are discussed based on the modal analysis of the semi cylindrical shell in the finite cube water area. At the beginning of this paper, the possibility of using the typical shell structure to replace the representational ship structure is discussed, and the research structure is discussed Frequency range of sampling required. In the process of ship berthing, with the approach of berthing distance, the distance between ship and shore wall is getting closer and closer,

Therefore, the focus of this paper is to explore the influence of the distance between the rigid wall and the typical ship structure on the vibration and sound radiation of the structure. The research results show that the distance between the structure and the wall is close, which results in the change of the vibration and sound radiation intensity of the structure.

The main feature of this paper is that the fully submerged half cylindrical shell with ribs is used for research, which is different from the traditional cylindrical shell research and can reflect the real ship structure characteristics.

Key words: Typical ship structure；Finite cube water area；Distance from shore； Vibration and sound radiation

目录

第1章 绪论..................................................................................................................5

1.1 选题背景以及意义.........................................................................................5

1.2 国内外研究现状.............................................................................................5

1.2.1 典型船舶结构固有频率和振型的计算..................................................6

1.2.2 声辐射分析..............................................................................................7

1.3 有限元法和声学边界元法.............................................................................7

1.4 文章结构安排.................................................................................................8

第2章 典型壳体结构的声振理论研究.......................................................................9

2.1 结构振动基本理论.........................................................................................9

2.2 声辐射基本理论...........................................................................................10

第3章 基于ABAQUS的船体简化结构模型振动分析...........................................13

3.1 建立典型船舶结构.......................................................................................13

3.2 几何模型.......................................................................................................13

3.3 分析步设置...................................................................................................14

3.4 网格设置.......................................................................................................14

3.5 有限元模型结果...........................................................................................15

第4章 基于virtual.lab 的边界元分析......................................................................17

4.1 建立边界元模型...........................................................................................17

4.2 船舶结构声辐射计算...................................................................................18

第5章 结论................................................................................................................27

第6章 总结与展望....................................................................................................28

6.1 论文工作总结...............................................................................................28

6.2 对未来工作的展望.......................................................................................38

参考文献......................................................................................................................39

致谢..............................................................................................................................30

第1章 绪论

1.1 选题背景以及意义

现代港口建设不仅要求前期规划施工满足一系列工程经济条件，更要求港口后期运营中尽可能绿色环保和可持续发展，船舶在航行的全过程中所产生的振动和声辐射是一种污染，既会影响相关人员的身心健康，也会造成水域环境的污染。本课题以港口靠港典型船舶结构的振动和声辐射为研究背景，探究用有限元方式模拟振动和声辐射的传播效应，达到节能减排，满足港口安全生产和发展的需要。

船舶的靠泊过程，是船舶整个航行周期中最重要也可能最危险的阶段，同样的，船舶在靠离港过程中所产生的振动与声辐射效应，也影响着船舶操纵性能和操作人员的生理与心理感受。港区水域面积小，船舶活动范围受限，一旦发生事故，很容易造成极大的人员伤亡和财产损失。

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