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집중질량 라인모델을 이용한 Steel Lazy Wave Riser의 비선형 동적 해석Nonlinear Dynamic Analysis of Steel Lazy Wave Riser using Lumped Mass Line Model

Other Titles
Nonlinear Dynamic Analysis of Steel Lazy Wave Riser using Lumped Mass Line Model
Authors
오승훈정재환박병원권용주정동호
Issue Date
2019
Publisher
한국해양공학회
Keywords
Lumped mass line model 집중질량 라인모델; Explicit method 명시적 방법; Dynamic simulation 동적 시뮬레이션; Numerical code 수치코드; Steel lazy wave riser(SLWR) 심해 라이저
Citation
한국해양공학회지, v.33, no.5, pp 400 - 410
Pages
11
Journal Title
한국해양공학회지
Volume
33
Number
5
Start Page
400
End Page
410
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/372
DOI
10.26748/KSOE.2019.069
ISSN
1225-0767
2287-6715
Abstract
In this study, the numerical code for the 3D nonlinear dynamic analysis of an SLWR (Steel Lazy Wave Riser) was developed using the lumped mass line model in a FORTRAN environment. Because the lumped mass line model is an explicit method, there is no matrix operation. Thus, the numerical algorithm is simple and fast. In the lumped mass line model, the equations of motion for the riser were derived by applying the various forces acting on each node of the line. The applied forces at the node of the riser consisted of the tension, shear force due to the bending moment, gravitational force, buoyancy force, riser/ground contact force, and hydrodynamic force based on the Morison equation. Time integration was carried out using a Runge?Kutta fourth-order method, which is known to be stable and accurate. To validate the accuracy of the developed numerical code, simulations using the commercial software OrcaFlex were carried out simultaneously and compared with the results of the developed numerical code. To understand the nonlinear dynamic characteristics of an SLWR, dynamic simulations of SLWRs excited at the hang-off point and of SLWRs in regular waves were carried out. From the results of these dynamic simulations, the displacements at the maximum bending moments at important points of the design, like the hang-off point, sagging point, hogging points, and touch-down point, were observed and analyzed.
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