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동적이완법을 이용한 Steel Lazy Wave Riser의 정적형상 추정에 관한 수치해석적 연구Numerical Study on Estimation of Static Configuration of Steel Lazy Wave Riser Using Dynamic Relaxation Method

Other Titles
Numerical Study on Estimation of Static Configuration of Steel Lazy Wave Riser Using Dynamic Relaxation Method
Authors
오승훈정재환박병원권용주정동호
Issue Date
2018
Publisher
한국해양공학회
Keywords
Dynamic relaxation method 동적이완법; Static configuration 초기형상; Lumped mass model 집중질량모델; Fictitious mass 가상질량; Viscous damping formulation 점성 감쇠 정식화; Steel lazy wave riser(SLWR)
Citation
한국해양공학회지, v.32, no.6, pp 466 - 473
Pages
8
Journal Title
한국해양공학회지
Volume
32
Number
6
Start Page
466
End Page
473
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/495
DOI
10.26748/KSOE.2018.32.6.466
ISSN
1225-0767
2287-6715
Abstract
This paper presents an estimation method for the static configuration of a steel lazy wave riser (SLWR) using the dynamic relaxation method applied to estimate the configuration of structures with strong geometric non-linearity. The lumped mass model is introduced to reflect the flexible structural characteristics of the riser. In the lumped mass model, the tensions, shear forces, buoyancy, self-weights, and seabed reaction forces at nodal points are considered in order to find the static configuration of the SLWR. The dynamic relaxation method using a viscous damping formulation is applied to the static configuration analysis. Fictitious masses are defined at nodal points using the sum of the largest direct stiffness values of nodal points to ensure the numerical stability. Various case studies were performed according to the bending stiffness and size of the buoyancy module using the dynamic relaxation method. OrcaFlex was employed to validate the accuracy of the developed numerical method.
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친환경해양개발연구본부 (심해공학연구센터)
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