毕业论文移动版

摘 要三维结构砰击载荷预报及结构响应分析是一个十分复杂的涉及水域-空气域-固体三相耦合的问题。由于砰击在工程实际应用中普遍存在，使得对砰击载荷预报及结构响应的研究显得十分重要,本文着重研究了通过试验方法以及数值模拟仿真方法预报三维结构的砰击压力及结构响应。77118

本文以三维圆柱体和圆锥体为研究对象，利用试验和数值仿真方法分析了圆锥体和圆柱体在砰击过程中的载荷变化，系统讨论了不同底升角和入水高度对砰击载荷的影响规律。主要研究内容如下：

1、从理论，试验，仿真三个方面简单介绍国内外在砰击载荷预报方面的研究现状，由此提出了本文的主要研究内容。

2、进行了三维圆柱体和圆锥体试验设计，具体给出了底升角为30°的圆锥体从不同高度自由入水时其上砰击载荷在时间和空间上的分布情况。得出对同一底升角条件下的圆锥体，其砰击压力及峰值会随着入水速度的增大而增大。

3、采用有限元分析软件ABAQUS实现了对三维圆柱体以及不同底升角情况下的圆锥体的入水过程的数值仿真模拟。简单介绍了数值仿真过程中的一些主要参数设置。

4、比较了实验条件下和数值仿真条件下，底升角为30°的圆锥体在不同速度下的受力以及在一定速度下不同底升角的圆锥体的受力情况，验证了数值仿真方法在研究三维结构载荷和结构响应方面的可行性。

毕业论文关键字：砰击；三维结构；试验；数值仿真

Abstract Three-dimensional structure prediction and slamming structural response analysis is a very complex involving problem water - air domain - solid-phase coupling。 Since slamming is common in engineering practice, making the researches to predict the slamming structural response very important, this article focuses on the pressure and slamming structural response prediction by the three-dimensional structures - Test methods and numerical simulation methods。

In this paper, a three-dimensional cylinder and cone are studied, analysis of the cone and cylinder load changes slamming process using experimental and numerical simulation methods, systems, discusses the different angle and lift the bottom into the water height on slamming load law。 The main contents are as follows:

1。 In terms of the theoretical, experimental, simulation three brief research status at home and abroad, which presents the main contents of this paper。

2。 Make a three-dimensional cylinder and a cone test designed specifically gives rise bottom cone angle of 30 ° from the different degree of freedom into the water on slamming load distribution in time and space。 Draw on the same cone angle bottom liters conditions, which will peak pressure and slamming into the water as speed increases。

3。 ABAQUS finite element analysis software to achieve the numerical simulation of three-dimensional cylinder and cone bottom liter different angle of the case into the water process。 Here we give a brief introduction to the numerical simulation of some key parameters。

4。 Comparison of the experimental conditions and under conditions of numerical simulation, the end lead angle of 30 ° cone of the force at different speeds and the forces at the end of a constant speed different lead angle of the cone, the numerical simulation to verify feasibility loads and structural response in terms of three-dimensional structure of the study。

Keywords: Slamming; three-dimensional structure; experiment; numerical simulation   

目 录

第一章 绪论 1

1。1 研究背景及意义 1

1。2 国内外研究现状 3