Utilization of modern 3D product model in global finite element strength assessment
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School of Engineering |
Master's thesis
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Date
2013
Department
Major/Subject
Laivanrakennusoppi
Mcode
Kul-24
Degree programme
Language
en
Pages
[10] + 128
Series
Abstract
During the past few decades the world trade commerce has set new standards for the shipping industry. To overcome the new challenges, the industry had to use the most modern computer-aided engineering tools for design of ships and offshore structures. Finite element analysis is the most reliable mathematical solution to deal with large complex structures such as ships. An equivalent 3D product model of the real structure is created in real life to imitate its real behaviour during operation. The main purpose of this study was to develop an automated method to transfer different types of loads acting on the structural elements to the finite element mesh in terms of forces and pressures acting on the respective nodes and elements. First an introduction to basic theory of finite element and sea keeping analysis is described. Later, the process of obtaining the equivalent loads acting on the hull is divided into three components: equipment masses, tank pressure and external wave loads. All three loads have two components: static and wave induced. An algorithm was written to automatically calculate the loads and input them into the finite element mesh. Finally, a case study was developing to test whether the methods proposed are valid. The study concludes that utilizing a modern 3D product model to prepare the equivalent mathematical model is a powerful tool to reduce man hours and improve the overall reliability of the design. Nevertheless, the quality of the results is greatly impacted by quality of the model. Further studies should be conducted to expand the presented study for other types of loads, as well to improve overall functioning of the automated load transfer process.Description
Supervisor
Romanoff, JaniThesis advisor
Kurki, TommiKeywords
finite element, panel methods, strength analysis, hydrodynamic, hydrostatic, vertical bending moment, hogging, sagging