Ocean Systems Engineering

  • 제9권4호
  • /
  • Pages.423-448
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  • 2019
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  • 2093-6702(pISSN)
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  • 2093-677X(eISSN)
테크노프레스 (Techno-Press)
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Hydroelastic analysis of a truss pontoon Mobile Offshore Base

  • Somansundar, S. (Department of Ocean Engineering, Indian Institute of Technology Madras) ;
  • Selvam, R. Panneer (Department of Ocean Engineering, Indian Institute of Technology Madras) ;
  • Karmakar, D. (Department of Applied Mechanics and Hydraulics, National Institute of Technology Karnataka)
  • 투고 : 2018.09.30
  • 심사 : 2019.10.12
  • 발행 : 2019.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

Very Large Floating Structures (VLFS) are one among the solution to pursue an environmentally friendly and sustainable technology in birthing land from the sea. VLFS are extra-large in size and mostly extra-long in span. VLFS may be classified into two broad categories, namely the pontoon type and semi-submersible type. The pontoon-type VLFS is a flat box structure floating on the sea surface and suitable in regions with lower sea state. The semi-submersible VLFS has a deck raised above the sea level and supported by columns which are connected to submerged pontoons and are subjected to less wave forces. These structures are very flexible compared to other kinds of offshore structures, and its elastic deformations are more important than their rigid body motions. This paper presents hydroelastic analysis carried out on an innovative VLFS called truss pontoon Mobile Offshore Base (MOB) platform concept proposed by Srinivasan and Sundaravadivelu (2013). The truss pontoon MOB is modelled and hydroelastic analysis is carried out using HYDRAN-XR* for regular 0° waves heading angle. Results are presented for variation of added mass and damping coefficients, diffraction and wave excitation forces, RAOs for translational, rotation and deformational modes and vertical displacement at salient sections with respect to wave periods.

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참고문헌

  1. Barrientos, M.A., Gatica, G.N., Rodriguez, R. and Torrejon, M.E. (2004), "Analysis of a coupled BEM/FEM Eigen solver for the hydroelastic vibrations problem", ESAIM: Math. Model. Numer. Anal., 38(4), 653-672. https://doi.org/10.1051/m2an:2004028
  2. Bishop, R.E.D. and Price, W.G. (1976), "On the relationship Between Dry modes and Wet modes in the theory of ship Response", J. Sound Vib., 45(2), 157-164. https://doi.org/10.1016/0022-460X(76)90595-2
  3. Bishop, R.E.D., Price, W.G. and Wu, Y. (1986), "A general linear hydroelasticity theory of floating structures moving in a seaway", Royal Society, 316(1538), 375-426
  4. Chakrabarti, S.K. (1987), Hydrodynamics of Offshore Structures, WIT press.
  5. Huang, L.L. and Riggs, H.R. (2005), "Development of a new interfacing strategy for fluid-structure interaction", J. Eng. Maritime Environ., 219, 131-148.
  6. ISSC.(2006), "Report of specialist Task Committee VI.2, very large floating structures", (Eds., Frieze, P.A., Shenoi, R.A.), Proceedings of the 16th International Ship and Offshore Structure Congress, Southampton, UK.
  7. Kim, B.W., Hong, S.Y., Kyoung, J.H. and Cho, S.K. (2007), "Evaluation of bending moments and shear forces at unit connections of very large floating structures using hydroelastic and rigid body analyses", Ocean Eng., 34(11-12), 1668-1679. https://doi.org/10.1016/j.oceaneng.2006.10.018
  8. Lee, S.W. and Webster, W.C. (1994), "A preliminary to the design of a hydroelastic model of a floating airport", Proceeding of the International Conference on Hydroelasticity in Marine Technology, Trondheim, Norway.
  9. Liu, J., Riggs, H.R. and Tessler, A. (2000), "A four-node shear deformable shell element developed via explicit Kirchhoff constraints", Int. J. Numer. Meth. Eng., 49, 1065-1086. https://doi.org/10.1002/1097-0207(20001120)49:8<1065::AID-NME992>3.0.CO;2-5
  10. Patran, M.S.C. (2016), User's Guides and Reference Manuals.
  11. Pinkster, J.A. and Scholte, E.M. (2001), "The behaviour of a large air-supported MOB at sea", Mar. Struct., 14(1-2), 163-179. https://doi.org/10.1016/S0951-8339(00)00044-7
  12. Riggs, H.R. (2016), Hydrodynamic Response Analysis with Integrated Structural Finite Element Analysis, HYDRAN-XR, v 16.3.
  13. Riggs, H.R. and Ertekin, R.C. (1998), "Impact of connector stiffness on the response of a multi-module mobile offshore base", Proceedings of the 8th International Offshore and Polar Engineering Conference, Montreal, Canada.
  14. Riggs, H.R. and Ertekin, R.C. (1999), "Response characteristics of serially connected semisubmersibles", J. Ship Res., 43(4), 229-240. https://doi.org/10.5957/jsr.1999.43.4.229
  15. Riggs, H.R., Hideyuki, S., Ertekin, R.C., Jang, W.K. and Iijima, K. (2008), "Comparison of hydroelastic computer codes based on the ISSC VLFS benchmark", Ocean Eng., 35, 589-597. https://doi.org/10.1016/j.oceaneng.2008.01.012
  16. Riggs, H.R., Niimi, K.M. and Huang, L.L. (2007), "Two benchmark problems for three-dimensional, linear hydroelasticity", J. Offshore Mech. Arct., 129, 149-157. https://doi.org/10.1115/1.2746397
  17. Srinivasan, N. and Sundaravadivelu, R. (2013), "Ocean space utilization using very large floating semi-submersible", Proceedings of the ASME 32nd international Conference on Ocean, Offshore and Arctic Engineering, Nantes, France.
  18. Srinivasan, N., Chakrabarti, S. and Radha, R. (2006), "Response analysis of a Truss-Pontoon Semisubmersible with Heave-Plates", J. Offshore Mech. Arct., 128.
  19. Suzuki, H., Yoshida, K. and Iijima, K. (1996), "A consideration of the structural design of a large-scale floating structures", J. Mar. Sci. Technol., 1, 255-267. https://doi.org/10.1007/BF02390724
  20. Tulin, M.P. (1999), "Hydroelastic scaling", Proceedings of 3th International Workshop on Very Large Floating Structures, Honolulu, Hawaii, USA.
  21. Venkataraman, V. (2001), "Dynamic response of a mobile offshore base hydroelastic test model", M.S. dissertation, The university of Maine.
  22. Wang, C.M. (2015), "Mega floating structures", Singapore maritime technology conference, Singapore.
  23. Wu, Y., Wang, D., Riggs, H.R. and Ertekin, R.C. (1993), "Composite singularity distribution method with application to hydroelasticity", Mar. Struct., 6, 143-163. https://doi.org/10.1016/0951-8339(93)90017-W
  24. Zueck, R., Palo, P. and Taylor, T. (1998), "Mobile offshore base", Proceedings of the 8th International Offshore and Polar Engineering Conference, Montreal, Canada.