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Wave Load Calculation Based Linear Potential Flow Theory and Its Application

Author: ZhangRunHong
Tutor: ZhuLiangSheng
School: South China University of Technology
Course: Design and manufacture of ships and marine structures
Keywords: Linear potential flow theory Wave loads Wet surface Finite Element Longitudinal strength
CLC: U661.1
Type: Master's thesis
Year: 2011
Downloads: 98
Quote: 0
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Abstract


The impact of waves on marine structures are many, it can affect the ship's speed, stability, offshore platform installation, mooring stability. At the same time, the wave will be the structure of marine structures generate a huge wave loads, wave loads have led to a lot of ships and offshore platforms damage, fracture and sank, brought huge losses to human life and property. Recent decades, with the development of computer technology and computational methods, many complex engineering problems are regional discretization of numerical calculation and the use of computer numerical solutions to meet engineering requirements. The development and use of computer ship wave loads computing has become an inevitable way of the development of the industry. This paper is based on SESAM MSC.PATRAN NASTRAN commercial software platform for numerical calculation of wave loads and structural finite element analysis. The article can be divided into three parts, the first part of the development of the wave hydrodynamic theory of the development of three-dimensional linear potential flow theory, the research results as well as the application of engineering. The second part is the core of this article, calculated by two engineering ship to study the three-dimensional linear potential flow theory to calculate the results, the differences in the characteristics of the two-dimensional theory; study the relationship between the draft and the wave loads, draw the maximum wave load corresponding Draft is not necessarily a full load or no-load draft, is the conclusion of the draft conditions; final draft ship wave motion performance, draw a graph of wave action center coordinates, can be analyzed by using the figure hull waves hydrodynamic conditions. More when the third part of the previous chapter concluded further argument further instructions, take advantage of the way of the pursuit of obtaining the maximum wave load calculation results than simple select full load or no-load conditions, through the calculation of the structure analysis dangerous, more in line with the actual situation. Innovation: the choice of maximum wave loads, and found a to select full load or no-load conditions as the deviation of the maximum wave conditions, the more reasonable choice - draft pursue select maximum wave loads. With draft changes the wave force, wave force is drawn draft with the central point of the graph, you can take advantage of the figure the ship wave hydrodynamic analysis from a new angle. The results of this study will help further research ship by sea wave load situation, the ship's structure to provide more powerful data support the fight against wave action, and provide reference for the structural design of the ship.

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship Principle > Ship hydrodynamics
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