DOI QR코드

DOI QR Code

Turret location impact on global performance of a thruster-assisted turret-moored FPSO

  • Kim, S.W. (Department of Ocean Engineering, Texas A&M University) ;
  • Kim, M.H. (Department of Ocean Engineering, Texas A&M University) ;
  • Kang, H.Y. (Department of Ocean Engineering, Texas A&M University)
  • 투고 : 2016.07.15
  • 심사 : 2016.08.28
  • 발행 : 2016.09.25

초록

The change of the global performance of a turret-moored FPSO (Floating Production Storage Offloading) with DP (Dynamic Positioning) control is simulated, analyzed, and compared for two different internal turret location cases; bow and midship. Both collinear and non-collinear 100-yr GOM (Gulf of Mexico) storm environments and three cases (mooring-only, with DP position control, with DP position+heading control) are considered. The horizontal trajectory, 6DOF (degree of freedom) motions, fairlead mooring and riser tension, and fuel consumptions are compared. The PID (Proportional-Integral-Derivative) controller based on LQR (linear quadratic regulator) theory and the thrust-allocation algorithm which is based on the penalty optimization theory are implemented in the fully-coupled time-domain hull-mooring-riser-DP simulation program. Both in collinear and non-collinear 100-yr WWC (wind-wave-current) environments, the advantage of mid-ship turret is demonstrated by the significant reduction in heave at the turret location due to the minimal coupling with pitch mode, which is beneficial to mooring and riser design. However, in the non-collinear WWC environment, the mid-turret case exhibits unfavorable weathervaning characteristics, which can be reduced by employing DP position and heading controls as demonstrated in the present case studies. The present study also reveals the plausible cause of the failure of mid-turret Gryphon Alpha FPSO in milder environment than its survival condition.

키워드

과제정보

연구 과제 주관 기관 : DSME (Daewoo Shipbuilding and Marine Engineering)

참고문헌

  1. Duggal, A.S., Heyl, C.N. and Vance, G.P. (2000), Global Analysis of the Terra Nova FPSO Turret Mooring System, Paper presented at the Offshore Technology Conference.
  2. Eom, T.S., Kim, M.H., Bae, Y. and Cifuentes, C. (2014), "Local dynamic buckling of FPSO steel catenary riser by coupled time-domain simulations", Ocean Syst. Eng., 4(3), 215-241. https://doi.org/10.12989/ose.2014.4.3.215
  3. Finucane, M. (2012), Details of Gryphon Incident - Lessons Learned Aberdeen International Organization Safety and Healith Conference.
  4. Isherwood, R. (1973). Wind resistance of merchant ships. RINA Supplementary Papers, 115.
  5. Kang, H.Y. and Kim, M.H. (2014), "Safety assessment of caisson transport on a floating dock by frequency-and time-domain calculations", Ocean Syst. Eng., 4(2), 99-115. https://doi.org/10.12989/ose.2014.4.2.099
  6. Kannah, T.R. and Natarajan, R. (2006), "Effect of turret location on the dynamic behaviour of an internal turret moored FPSO system", J. Naval Architect. Marine Eng., 3(1), 23-37.
  7. Kim, M.H., Koo, B.J., Mercier, R. and Ward, E. (2005), "Vessel/mooring/riser coupled dynamic analysis of a turret-moored FPSO compared with OTRC experiment", Ocean Eng., 32(14), 1780-1802. https://doi.org/10.1016/j.oceaneng.2004.12.013
  8. Kim, S.J. and Kim, M.H. (2015), "Dynamic behaviors of conventional SCR and lazy-wave SCR for FPSOs in deepwater", Ocean Eng., 106, 396-414. https://doi.org/10.1016/j.oceaneng.2015.06.039
  9. OCIMF. (1996), Prediction of wind loads and current loads on VLCCs.
  10. Ran, Z. and Kim, M.H. (1997), "Nonlinear coupled responses of a tethered spar platform in waves", Int. J. Offshore Polar Eng., 7(2).
  11. Rao, S.S. and Rao, S. (2009), Engineering optimization: theory and practice: John Wiley & Sons.
  12. Rindaroy, M. and Johansen, T.A. (2013), "Fuel optimal thrust allocation in dynamic positioning", IFAC Proceedings Volumes, 46(33), 43-48.
  13. Ryu, S. (2003), Hull/Mooring/Riser coupled motion simulations of thruster-assisted moored platforms. Texas A&M University.
  14. Kim, S.W. (2016), Eco-Friendly Dynamic Positioning Algorithm Development Texas A&M University Ph.D. Dissertation.
  15. Tahar, A. and Kim, M.H. (2003). "Hull/mooring/riser coupled dynamic analysis and sensitivity study of a tanker-based FPSO". Appl. Ocean Res., 25(6), 367-382. https://doi.org/10.1016/j.apor.2003.02.001
  16. Thiagarajan, K. and Finch, S. (1999). "An Investigation Into the Effect of Turret Mooring Location on the Vertical Motions of an FPSO Vessel". J. Offshore Mech. Arct., 121(2), 71-76. https://doi.org/10.1115/1.2830080
  17. Yang, C.K. and Kim, M.H. (2011), "The structural safety assessment of a tie-down system on a tension leg platform during hurricane events", Ocean Syst. Eng., 1(4), 263-283. https://doi.org/10.12989/ose.2011.1.4.263

피인용 문헌

  1. Time-Domain Hydro-Elastic Analysis of a SFT (Submerged Floating Tunnel) with Mooring Lines under Extreme Wave and Seismic Excitations vol.8, pp.12, 2018, https://doi.org/10.3390/app8122386
  2. Fuel-Optimal Thrust-Allocation Algorithm Using Penalty Optimization Programing for Dynamic-Positioning-Controlled Offshore Platforms vol.11, pp.8, 2018, https://doi.org/10.3390/en11082128
  3. Dynamic responses of an FPSO moored on sloped seabed under the action of environmental loads vol.8, pp.3, 2018, https://doi.org/10.12989/ose.2018.8.3.329