FPSO 안정성 평가를 위한 절단계류선 모델링 수치 연구
Numerical Study on Designing Truncated Mooring Lines for FPSO Stability Analysis
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참고문헌
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초록
In this paper, a numerical analysis for an internal turret moored vessel located at a 400-m water depth is conducted. The targetvessel has an internal turret that is located at the 0.2 Lpp position from the fore-side, with 3 × 4 complex mooring lines installed around the turretcircumference. To investigate the motion response of the vessel and the structural reliability of the lines, model tests were conducted. The KRISOocean basin has a water depth of 3.2 m, which represents 192m using a scaling of 1:60. In order to precisely represent the real-scale condition,equivalent mooring lines needed to be designed. Truncated mooring lines were designed to supplement the restriction of the flume's water depth andincrease the reliability of the model testing. These truncated mooring lines were composed of two different chains in order to match the pre-tension,simultaneously restoring the curve and variation in the effective line tension. The static similarities were compared using a static pull-out test andfree decaying test, and the dynamic similarities were matched via a regular wave test and combined environments test. Consequently, the designedtruncated mooring system could represent the prototype mooring system relatively well in the aspects of kinematics and dynamics.
Abstract
In this paper, a numerical analysis for an internal turret moored vessel located at a 400-m water depth is conducted. The targetvessel has an internal turret that is located at the 0.2 Lpp position from the fore-side, with 3 × 4 complex mooring lines installed around the turretcircumference. To investigate the motion response of the vessel and the structural reliability of the lines, model tests were conducted. The KRISOocean basin has a water depth of 3.2 m, which represents 192m using a scaling of 1:60. In order to precisely represent the real-scale condition,equivalent mooring lines needed to be designed. Truncated mooring lines were designed to supplement the restriction of the flume's water depth andincrease the reliability of the model testing. These truncated mooring lines were composed of two different chains in order to match the pre-tension,simultaneously restoring the curve and variation in the effective line tension. The static similarities were compared using a static pull-out test andfree decaying test, and the dynamic similarities were matched via a regular wave test and combined environments test. Consequently, the designedtruncated mooring system could represent the prototype mooring system relatively well in the aspects of kinematics and dynamics.
참고문헌 (5)
- Cho, S. K, "A Research on Dynamic Tension Response of Model Mooring Chain by Forced Oscillation test", Proc. of Korea Society of Ocean Engineers, pp.134~141 (2002)
- Orcina Ltd, "OrcaFlex Manual ver 9.5a" (2011), Cumbria UK
- Stansberg, C. T, "Model Testing for Ultra Deep Water", Proceeding of Offshore Technology Conference(OTC 16587), pp.1~9 (2004)
- Waals, O. J, "Truncation Methods for Deep Water Mooring Systems for a Catenary Moored FPSO and a Semi Taut Moored Semi Submergible", Proceeding of Deep Offshore Technology Conference, 24(1) (2004)
- Wichers, J.E.W, "A simulation model for a single point moored tanker", 박사, pp.1988