다양한 형상의 Jack-up Leg에 대한 해양 동역학적 수치해석

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 28; no. 5; pp. 371 - 377
• Main Authors: 김지석(Ji-Seok Kim), 박민수(Min-Su Park), 구원철(Weoncheol Koo)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2014
• Subjects: 해양공학; Offshore wind turbine installation vessel 해상 풍력 발전기 설치선; Jack-up leg 잭업 레그; Newmark-beta method 뉴마크 베타법; Natural period 고유주기; Morison equation 모리슨 방정식; Modal analysis 모드해석
• ISSN: 1225-0767; 2287-6715

In this study, the hydrodynamic characteristics of various types of jack-up legs for a wind turbine installation vessel were analyzed. Using the modified Morison equation, the wave and current excitation forces on the jack-up legs were calculated. A modal analysis was performed to predict the dynamic responses for various types of jack-up legs. The Newmark-beta time integration scheme was used to solve the equation of motion in waves in the time domain. The maximum displacement and maximum bending stress were computed for four different types of legs, and their results were compared to select an optimum leg type. Finally, a six-leg jack-up rig with the selected optimal legs was modeled, and its natural period and hydrodynamic behaviors were evaluated.