Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Motion Analysis of Two Floating Platforms with Mooring and Hawser Lines in Tandem Moored Operation by Combined Matrix Method and Separated Matrix Method

  • KOO BON-JUN (Basic Design Part, Offshore Design Team, Samsung Heavy Industries Co. Ltd.) ;
  • KIM MOO-HYUN (Coastal and Ocean Engineering Program, Department of Civil Engineering, Texas A&M University, College Station, USA.)
  • Published : 2005.10.01
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Abstract

The motion behaviors including hydrodynamic interaction and mechanical coupling effects on multiple-body floating platforms are simulated by using a time domain hull/mooring/riser coupled dynamics analysis program. The objective of this study is to evaluate off-diagonal hydrodynamic interaction effects and mechanical coupling effects on tandem moored FPSO and shuttle taker motions. In the multiple-body floating platforms interaction, hydrodynamic coupling effects with waves and mechanical coupling effects through the connectors should be considered. Thus, in this study, the multiple-body platform motions are calculated by Combined Matrix Method (CMM) as well as Separated Matrix Method (SMM). The advantage of the combined matrix method is that it can include all the 6Nx6N full hydrodynamic and mechanical interaction effects among N bodies. Whereas, due to the larger matrix size, the calculation time of Combined Matrix Method (CMM) is longer than the Separated Matrix Method (SMM). On the other hand, Separated Matrix Method (SMM) cannot include the off-diagonal 6x6 hydrodynamic interaction coefficients although it can fully include mechanical interactions among N bodies. To evaluate hydrodynamic interaction and mechanical coupling effects, tandem moored FPSO and shuttle tanker is simulated by Combined Matrix Method (CMM) and Separated Matrix Method (SMM). The calculation results give a good agreement between Combined Matrix Method (CMM) and Separated Matrix Method (SMM). The results show that the Separated Matrix Method (SMM) is more efficient for tandem moored FPSO and shuttle tanker. In the numerical calculation, the hydrodynamic coefficients are calculated from a 3D diffraction/radiation panel program WAMIT, and wind and current forces are generated by using the respective coefficients given in the OCIMF data sheet.

Keywords

References

  1. Arcandra, T. (2001), 'Hull/Mooring/Riser Coupled Dynamic Analysis of a Deepwater Floating Platform with Polyester Lines', PhD. Dissertation, Civil Engineering Department, Texas A&M University, College Station, TX
  2. Arcandra, T., Nurtjahyo, P. and Kim, M.H., (2002), 'Hull/Mooring/Riser Coupled Analysis of a Turret-Moored FPSQ 6000 ft: Comparison between Polyester and Buoys-Steel Mooring Lines', Proc. 11th Offshore Symposium The Texas Section of the Society of Naval Architects and Marine Engineers, SNAME, pp 1-8
  3. Buchner, B., Dijk, A. and Wilde, J. (2001), 'Numerical Multiple-Body Simulations of Side-by-Side Mooring To a n FPSQ', Proc. 11th lnt. Offshore and Polar Eng. Conference, ISOPE, Vol 1, pp 343-353
  4. Choi, Y.R. and Hong, S.Y (2002), 'An Analysis of Hydrodynamic Interaction of Floating Multi-Body Using Higher-Order Boundary Element Method' Proc. 12th Int. Offshore and Polar Eng. Conference, ISOPE, Vol 1, pp 303-308
  5. Fang, M.C. and Kim, C.H. (1986), 'Hydrodynamically Coupled Motions of Two Ship Advancing in Oblique Waves', Journal of Ship Research, Vol 30 (3), pp 159-171
  6. Garrett, D.L. (1982), 'Dynamic Analysis of Slender Rods' Journal Energy Resources Technology, Vol 104, pp 302-307 https://doi.org/10.1115/1.3230419
  7. Hong, S.Y., Kim J.H., Cho, S.K., Choi, Y.R., and Kim Y.S. (2003), 'Numerical and Experimental Study on Hydrodynamic Interaction of Side-by-Side Moored Multiple Vessels', Proc. of Deep Water Mooring System, ASCE, pp 198-215
  8. Kim, M.H., Arcandra, T. & Kim, Y.B., (2001a), 'Validability of Spar Motion Analysis against Various Design Methodologies/Parameters', Proc. 20th Offshore Mechanics and Arctic Eng. Conference, OMAE01-OFT1063 [CD-ROM], LA, Califonia
  9. Kim, M.H., Arcandra, T. and Kim, Y.B. (2001b), 'Validability of TLP Motion Analysis against Various Design Methodologies/Parameters' Proc. 11th Int. Offshore and Polar Eng. Conference, ISOPE, Vol 3, pp 465-473
  10. Kim, Y.B. (2003) 'Dynamic Analysis of Multiple-Body Floating Platforms Coupled with Mooring Lines and Risers', Ph.D. Dissertation, Civil Engineering Department, Texas A&M University, College Station
  11. Kodan, N. (1984), 'The Motion of Adjacent Floating Structure in Oblique Waves'. Proc. 3rd Offshore Mechanics and Arctic Eng. Conference, OMAE, New Orleans, Vol 1, pp 206-213
  12. Koo, B.J., Kim, M.H., and Randall, R.E. (2004), 'The Effect of Nonlinear Multi-contact Coupling with Gap between Risers and Guide Frames on Global Spar Motion Analysis', J. of Ocean Engineering. Vol 31/11-12, pp 1469-1502
  13. Lee, D.H. (2002) 'Nonlinear Stability Analysis and Motion Control of Tandem Moored Tankers', PhD. Dissertation, Naval Architecture and Ocean Engineering, Seoul National University
  14. Lee, C.H. (1999), WAMIT Theory Manual. Department of Ocean Engineering. MIT
  15. Lee, D.H. and Choi, H.S. (2000), 'A Dynamic Analysis of FPSO-Shuttle Tanker System', Proc. 10th Int. Offshore and Polar Eng. Conference, ISOPE, Vol 1, pp 302-307
  16. Loken A.E. (1981), 'Hydrodynamic Interaction between Several Floating Bodies of Arbitrary form in Waves. Proc. of Intl Symposium on Hydrodynamics in Ocean Engineering', NIT, Trondhiem, Vol 2, pp 745-779
  17. Ma, W., Lee, M.Y., Zou, J., and Huang, E.W. (2000), 'Deepwater Nonlinear Coupled Analysis Tool', Offshore Technology Conference, (OTC 12085), Houston, TX https://doi.org/10.4043/12085-MS
  18. Ohkush, M. (1974), 'Ship Motions in Vicinity of a Structure' Proc. of Intl Conf. on Behavior of Offshore Structure, NIT, Trondheim, Volt pp 284-306
  19. Sphaier, S.H., Fernandes, A.C., and Correa, S.H. (2000), 'Maneuvering model for the FPSO horizontal plane behavior', Proc. 10th Int. Offshore and Polar Eng. Conference, Vol 1, pp 337-344
  20. Van Oortmerssen, G. (1979), 'Hydrodynamic Interaction between Two Structures of Floating in Waves' Proc. Boss 79. 2nd Intl Conf. on Behavior of Offshore Structure, London, pp 339-356
  21. Wichers, J.E.W., Voogt, H.J., Roelofs, H.W. and Driessen, P.C.M. (2001b), 'DeepStar-CTR 4401- Benchmark Model Test. Technical', Rep. No 16417-1-OB, MARIN, Wageningen, Netherlands
  22. Wichers, J.E.W. and Develin, P.V. (2001a), 'Effect of Coupling of Mooring Lines and Risers on the Design Values for a Turret Moored FPSO in Deep Water of the Gulf of Mexico', Proc. 11th Int. Offshore and Polar Eng. Conference, 3, pp 480-487
  23. Wichers, J.E.W. (1988), 'A Simulation Model for a Single Point Moored Tanker', PhD. Dissertation, Delft University of Technology, Delft, The Netherlands