FPSO Riser 지지 구조의 강도설계에 대한 위상최적화 응용

다국어 초록 (Multilingual Abstract)

Recently, there has been an increase in the construction of various types of coastal structures for efficient wave dissipation, seawater exchange, and so on. Among these, a perforated slit caisson has been widely used to reduce the reflected wave energy and the wave pressure on the structure. Therefore, many studies on the wave force on a caisson, as well as the wave reflection from it, have been carried out with laboratory experiments and numerical analyses, considering it as a 2-D problem. However, because a structure like a perforated slit caisson has a variable 3-D shape, waves forces should be considered as a 3-D problem. Therefore, in this paper, a fully-nonlinear 3-D numerical model. (LES-WASS-3D) is proposed to examine the reflection characteristics of a perforated slit caisson with two chambers, The numerical model, LES-WASS-3D, was verified in a 3-D wave field by a comparison with existing experimental data for wave reflection coefficients. Then, using the numerical results, the reflection from a perforated slit caisson with two chambers was examined in relation to wave steepness, chamber width, and the shape/porosity of perforated slit.

목차 (Table of Contents)

• ABSTRACT
• 1. 서론
• 2. 위상 최적설계의 정식화
• 3. 평판 구조물의 위상 최적설계
• 4. FPSO 라이져 지지구조의 위상 최적설계
• 5. 결론
• 참고문헌

참고문헌 (Reference)

1 임영석, "재료분포의 연속적인 근사를 이용한 위상최적설계 방법의 비교 연구" 대한기계학회 30 (30): 164-170, 2006

2 유정훈, "자기장에 의한 조화가진을 받는 구조물의 위상최적화" 대한기계학회 25 (25): 1613-1620, 2001

3 정태환, "신뢰성 해석을 이용한 심해용 내압용기의 설계 최적화" 한국해양공학회 19 (19): 40-46, 2005

4 유철호, "선체 곡판의 롤 굽힘 공정 변수 결정을 위한가공 형상의 최적 근사 알고리즘" 대한조선학회 44 (44): 517-525, 2007

5 이동규, "보-기둥 구조물에서 위상최적화 기법을 이용한 정방형 유공의 최적 위치 산정에 관한 연구" 대한건축학회 22 (22): 47-54, 2006

6 Neves, M.M, "Topology Optimization of Periodic Microstructures with a Penalization of Highly Localized Buckling Modes" 54 (54): 809-834, 2002

7 Yoo, J, "Structural Optimization in Magnetic Devices by the Homogenization Design Method" 36 (36): 574-580, 2000

8 Diaz, A, "Solution to Shape and Topology Eigenvalue Optimization Problems Using a Homogenization Method" 35 (35): 1487-1502, 1992

9 BV, "Rules for the Classification of Offshore Units"

10 나승수, "Pareto 최적점 기반 다목적함수 기법에 의한 이중선각유조선의 최적구조설계" 대한조선학회 42 (42): 284-289, 2005

11 Bendsøe,M.P, "Optimal Shape Design as a Material Distribution Problem" 1 (1): 193-202, 1989

12 이주성, "Multi-objective Optimum Structural Design of Marine StructureConsidering the Productivity" 한국해양공학회 23 (23): 1-5, 2009

13 MSC Software, "MSC.NASTRAN User’s Manual Version 2008"

14 Bendsøe, M.P, "Generating Optimal Topologies in Structural Design Using a Homogenization Method" 71 : 197-224, 1988

15 Lotsberg, I, "Fatigue Capacity of Side Longitudinals in Floating Structures" 18 (18): 25-42, 2005

16 Xie, Y.M, "Evolutionary Structural Optimization" Springer 1997

17 Larson, U.D, "Design and Fabrication of Compliant Micromechanisms and Structures with Negative Poisson’s Ratio" 6 (6): 99-106, 1997

18 Ryu, S, "Coupled Dynamic Analysis of Thruster-Assisted Turret-Moored FPSO" 3 (3): 1613-1620, 2003

19 Altair Engineering, "Altair OptiStruct User’s Guide Version 9.0"

20 Suzuki, K, "A Homogenization Method for Shape and Topology Optimization" 93 (93): 291-318, 1991