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RISS 인기검색어
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- 주제어 : Second order wave loads (검색결과 6 건)
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Yang, Chan K.,Kim, M.H. Techno-Press 2011 Ocean systems engineering Vol.1 No.4
The performance of a rig tie-down system on a TLP (Tension Leg Platform) is investigated for 10-year, 100-year, and 1000-year hurricane environments. The inertia loading on the derrick is obtained from the three-hour time histories of the platform motions and accelerations, and the dynamic wind forces as well as the time-dependent heel-induced gravitational forces are also applied. Then, the connection loads between the derrick and its substructure as well as the substructure and deck are obtained to assess the safety of the tie-down system. Both linear and nonlinear inertia loads on the derrick are included. The resultant external forces are subsequently used to calculate the loads on the tie-down clamps at every time step with the assumption of rigid derrick. The exact dynamic equations including nonlinear terms are used with all the linear and second-order wave forces considering that some dynamic contributions, such as rotational inertia, centripetal forces, and the nonlinear excitations, have not been accounted for in the conventional engineering practices. From the numerical simulations, it is seen that the contributions of the second-order sum-frequency (or springing) accelerations can be appreciable in certain hurricane conditions. Finally, the maximum reaction loads on the clamps are obtained and used to check the possibility of slip, shear, and tensile failure of the tie-down system for any given environment.
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반강접 접합부를 적용한 초대형 부유식 구조물 상부구조체의 2차 탄성해석
송화철(Hwa-Cheol Song),이은숙(Eun-Suk Lee) 한국항해항만학회 2003 한국항해항만학회지 Vol.27 No.1
초대형 부유식 구조물의 상부구조는 육상 구조물과는 달리 파랑하중의 영향을 받기 때문에 하부부체의 변형에 의해서 상부구조물에는 부가 모멘트가 크게 발생한다. 이와 같은 부가모멘트의 저감을 위하여 보-기둥 접합부에 반강접의 도입에 관한 연구는 시작단계이며 반강접의 비선형 거동을 고려한 상부구조물의 연구는 초기단계이다. 본 논문에서는 초대형 부유식 구조물의 상부구조물에 정적하중과 진폭의 크기가 다른 파랑하중이 동시에 작용할 경우 강접 골조와 부분적으로 반강접 접합부가 사용된 세 가지 접합부 종류에 대한 2차 탄성해석을 수행하였다. 접합부는 웨브에 더블 앵글을 가진 상하 앵글(TSD)접합과 확장 엔드 플레이트 접합 그리고 각형강관 외다이아프램 접합부를 적용하였으며 중고층 구조물에 파랑하중이 작용할 경우 반강접 접합부의 위치에 따른 모멘트와 수평변위의 응답특성에 대하여 연구하였다. If semi-rigid connections are used for superstructures of very large floating structures(VLFS), the number of rigid connections can be reduced and more economical construction will be possible. In this study, considering service load and wave load in VLFS, the applicability of mixed use of rigid and semi-rigid connections has been studied using three types of connections for a four-bay eight-story frame. Three types of connections are used; top and seat-angle connections with double web-angle(TSD), extended end plate connections, steel tubular column with square external-diaphragm connections. ABAQUS(Finite element analysis program) is used for conducting second order elastic analysis.
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TSD 半剛接 接合部를 適用한 超大型 浮遊式 上部構造物의 2次 彈性解析
宋和澈,李恩淑 韓國海洋大學校 附設 海洋科學技術硏究所 2002 硏究論文集 Vol.11 No.1
In general, the semi-rigid connections are preferred for low rise structure, If semi-rigid connections are used for superstructures of very large floating structures(VLFS), the number of rigid connections can be reduced and more economical construction will be possible. In this study, considering service load and wave load in VLFS, the applicability of mixed use of rigid and semi-rigid connections has been studied using TSD connections for a four-bay eight-story frame. ABAQUS(Finite element analysis program) is used for conduction second order elastic analysis.
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An optimization framework of a parametric Octabuoy semi-submersible design
Xie, Zhitian,Falzarano, Jeffrey The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.-
An optimization framework using genetic algorithms has been developed towards an automated parametric optimization of the Octabuoy semi-submersible design. Compared with deep draft production units, the design of the shallow draught Octabuoy semi-submersible provides a floating system with improved motion characteristics, being less susceptible to vortex induced motions in loop currents. The relatively large water plane area results in a decreased natural heave period, which locates the floater in the wave period range with more wave energy. Considering this, the hull design of Octabuoy semi-submersible has been optimized to improve the floater's motion performance. The optimization has been conducted with optimized parameters of the pontoon's rectangular cross section area, the cone shaped section's height and diameter. Through numerical evaluations of both the 1st-order and 2nd-order hydrodynamics, the optimization through genetic algorithms has been proven to provide improved hydrodynamic performance, in terms of heave and pitch motions. This work presents a meaningful framework as a reference in the process of floating system's design.
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An optimization framework of a parametric Octabuoy semi-submersible design
Xie, Zhitian,Falzarano, Jeffrey The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.1
An optimization framework using genetic algorithms has been developed towards an automated parametric optimization of the Octabuoy semi-submersible design. Compared with deep draft production units, the design of the shallow draught Octabuoy semi-submersible provides a floating system with improved motion characteristics, being less susceptible to vortex induced motions in loop currents. The relatively large water plane area results in a decreased natural heave period, which locates the floater in the wave period range with more wave energy. Considering this, the hull design of Octabuoy semi-submersible has been optimized to improve the floater's motion performance. The optimization has been conducted with optimized parameters of the pontoon's rectangular cross section area, the cone shaped section's height and diameter. Through numerical evaluations of both the 1st-order and 2nd-order hydrodynamics, the optimization through genetic algorithms has been proven to provide improved hydrodynamic performance, in terms of heave and pitch motions. This work presents a meaningful framework as a reference in the process of floating system's design.
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