| Summary: | 碩士 === 國立中山大學 === 海洋環境及工程學系研究所 === 107 === In response to the global emphasis and development of renewable energy, solar power, and wind power generation have become the future trend under the promotion of governments. The Energy Bureau of the Ministry of Economic Affairs plans to promulgate an energy policy to set up thousands of offshore wind turbines. Offshore wind turbines are bound to require submarine cables as a transmission medium for electricity, connecting offshore wind farms and onshore substations. The submarine environment is complex, and improper laying of submarine cables and man-made damage may pose a considerable threat to the safe operation of submarine cables. While the submarine cable is mechanically damaged, it usually produces axial force, which is one of the main causes of damage to the submarine cable. The structure of the submarine cable is complex, consisting of the spiral armor and other functional components such as sheath, insulation, and conductor. The spiral armor also generates a torsion moment in addition to the axial elongation when subjected to a tensile load. However, the cable is also twisted during shipping and installation. Therefore, in addition to analyzing the tensile force, the analysis of the torque is also very important. In order to prevent the occurrence of damage, it is necessary to analyze the tensile and torsional mechanical processes of the submarine cable.
This study is divided into two types, one of which is to investigate the mechanical behavior of submarine cables under tension and torsion. The structural analysis was carried out with the static analysis software ANSYS-STATIC STRUCTURAL, and the stiffness of the cable would be verified by the tensile and torsional properties. The second is the design analysis of the armor and the core of cable. According to theoretical analysis, the main parameters affecting cable stiffness are the spiral angle and diameter of the armor. This study will investigate the change in cross-sectional properties when the angle and diameter of the armor are varied. Moreover, the number of armor layers and the number of conductors will also be changed to explore the advantages and disadvantages. Meanwhile, the effect of water pressure on the tensile force and torsional moment of the cable will be studied.
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