Approximate Optimization Using Moving Least Squares Response Surface Methods: Application to FPSO Riser Support Design
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초록
The paper deals with strength design of a riser support installed on floating production storage and offloading (FPSO) vessel under various loading conditions – operation, extreme, damaged, one line failure case (OLFC) and installation. The design problem is formulated such that thickness sizing variables are determined by minimizing the weight of a riser support structure subject to stresses constraints. The initial design model is generated based on an actual FPSO riser support specification. The finite element analysis (FEA) is conducted using MSC/NASTRAN,and optimal solutions are obtained via moving least squares method (MLSM) in the context of response surface based approximate optimization. For the meta-modeling of inequality constraint functions of stresses, a constraint-feasible moving least squares method (CF-MLSM) is used in the present study. The method of CF-MLSM, compared to a conventional MLSM, has been shown to ensure the constraint feasibility in a case where the approximate optimization process is employed. The optimization results present improved design performances under various riser operating conditions.
Abstract
The paper deals with strength design of a riser support installed on floating production storage and offloading (FPSO) vessel under various loading conditions – operation, extreme, damaged, one line failure case (OLFC) and installation. The design problem is formulated such that thickness sizing variables are determined by minimizing the weight of a riser support structure subject to stresses constraints. The initial design model is generated based on an actual FPSO riser support specification. The finite element analysis (FEA) is conducted using MSC/NASTRAN,and optimal solutions are obtained via moving least squares method (MLSM) in the context of response surface based approximate optimization. For the meta-modeling of inequality constraint functions of stresses, a constraint-feasible moving least squares method (CF-MLSM) is used in the present study. The method of CF-MLSM, compared to a conventional MLSM, has been shown to ensure the constraint feasibility in a case where the approximate optimization process is employed. The optimization results present improved design performances under various riser operating conditions.
참고문헌 (23)
- Belegundu, A.D, "Optimization Concept and Applications in Engineering" (1999), Prentice-Hall
- 정준모, "부유식 해양구조물의 완전 통계적 피로평가 프로그램 개발", 대한조선학회 논문집, 44(4), pp.425~438 (2007), 대한조선학회
- De Souza, M.J, "Structural Design of Process Decks for Floating Production, Storage and Offloading Units", Marine Structures, 11(10), pp.403~412 (1998)
- Haftka,R.T, "Using Bootstrap Methods for Conservative Estimations of Probability of Failure", 2006 NSF Design, Service, and Manufacturing Grantees and Research Conference (2006)
- Kim, C, "Reliability-Based Design Optimization Using Response Surface Method with Prediction Interval Estimation", Journal of Mechanical Design, 130(12), pp.121401~121412 (2008)
- 김상일, "FPSO선 Moon Pool 구조의 용접변형 해석에 관한 연구", 한국해양공학회지, 17(3), pp.27~32 (2003), 한국해양공학회
- Lancaster, P, "Curve and Surface Fitting: An Introduction" (1986), Academic Press
- Lee, J, "GA based Meta-Modeling of BPN Architecture for Constrained Approximate Optimization", International Journal of Solids and Structures, 44(18), pp.5980~5993 (2007)
- Lee, J, "Derivative and GA Based Methods in Meta-Modeling of Back-Propagation Neural Networks for Constraint Approximate Optimization", Structural and Multidisciplinary Optimization, 35(1), pp.29~40 (2008)
- Lee, J, "An Enhancement of Constraint Feasibility in BPNBased Approximate Optimization", Computer Methods in Applied Mechanics and Engineering, 196(17), pp.2147~2160 (2007)
- Lotsberg, I, "Fatigue Capacity of Side Longitudinals in Floating Structures", Marine Structures, 18(1), pp.25~42 (2005)
- Mangasarian,O.L, "Nonlinear Programming" (1969), McGraw- Hill
- MSC Software, "MSC.NASTRAN User’s Manual Version", ~ (2008)
- Picheny, V, "Conservative Predictions Using Surrogate Modeling", the 49th AIAA, ASCE, pp.AHS, ASC Structures, Structural Dynamics, and Materials Conference[DOI]
- Ryu, S, "Coupled Dynamic Analysis of Thruster-Assisted Turret-Moored FPSO", Oceans 2003b MTS, 2003, pp.3(22), 1613~1620
- 유상수, "Mooring Cost Sensitivity Study Based on Cost-Optimum Mooring Design", 한국해양공학회지, 23(1), pp.1~6 (2009), 한국해양공학회
- Song, C.Y, "Strength Design of Knuckle Component using Moving Least Squares Response Surface Based Approximate Optimization Methods", Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 223(8), pp.1019~1032 (2009)
- Sparks,C.P, "Fundamentals of Marine Riser Mechanics: Basic Principles and Simplified Analysis" (2007), PennWell
- Wolfe,P, "A Duality Theorem for Nonlinear Programming", Quarterly of Applied Mathematics, 19, pp.239~244 (1961)
- Xu, L, "Bow Impact Loading on FPSOs 1-Experimental Investigation", Ocean Engineering, 35(11), pp.1148~1157 (2008)
- Xu, L, "Bow Impact Loading on FPSOs 2-Theoretical Investigation", Ocean Engineering, 35(11), pp.1158~1165 (2008)
- Zou, T, "An Indicator Response Surface Method for Simulation- Based Reliability Analysis", Journal of Mechanical Design, 130(7), pp.0714010-1~014011 (2008)