An Application of Topology Optimization for Strength Design of FPSO Riser Support Structure

J. Ocean Eng. Technol. 2010;24(1):153-160.

Song Chang-Yong,Choung Joon-Mo,Shim Chun-Sik

Dep't of Mechanical Engineering Graduate School Yonsei University,Dep't of Naval Architecture and Ocean Engineering Inha University,Dep't of Naval Architecture and Marine Engineering Mokpo National University

FPSO Riser 지지 구조의 강도설계에 대한 위상최적화 응용

송창용,정준모,심천식

연세대학교 대학원 기계공학과,인하대학교 조선해양공학과,국립목포대학교 기계조선해양시스템공학부

Keywords: Strength design, Riser support structure, Floating production storage and offloading unit(FPSO), Topology optimization

핵심용어: 강도설계, 라이져 지지 구조, 부유식 생산 저장 하역 장치, 위상 최적화

Abstract

This paper deals with the topology optimized design of the riser support structures for floating production storage and offloading units (FPSOs) under global and local loading conditions. For a preliminary study and validation of the numerical approach, a simplified plate under static loading is first evaluated with the representative topology optimization methods, the Homogenization Design Method (HDM) and Density Method (DM) or Simple Isotropic Material with Penalization (SIMP). In the context of the corresponding riser support structures, the design problem is formulated such that structure shapes based on design domain variables are determined by minimizing the compliance subject to a mass target, considering the stress criterion. An initial design model is generated based on an actual FPSO riser support configuration. The topology optimization results present improved design performances under various loading conditions, while staying within the allowable limit of the offshore area.