Ocean Systems Engineering

  • 제3권1호
  • /
  • Pages.35-53
  • /
  • 2013
  • /
  • 2093-6702(pISSN)
  • /
  • 2093-677X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Analytical study on hydrodynamic motions and structural behaviors of hybrid floating structure

  • Jeong, Youn-Ju (Infra-Structure Research Department, Korea Institute of Construction Technology) ;
  • Lee, Du-Ho (Infra-Structure Research Department, Korea Institute of Construction Technology) ;
  • Park, Min-Su (Infra-Structure Research Department, Korea Institute of Construction Technology) ;
  • You, Young-Jun (Infra-Structure Research Department, Korea Institute of Construction Technology)
  • 투고 : 2013.02.22
  • 심사 : 2013.03.10
  • 발행 : 2013.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

In this study, a hybrid floating structure with cylinder was introduced to reduce the hydrodynamic motions of the pontoon type. The hybrid floating structure is composed of cylinders and semi-opened side sections to penetrate the wave impact energy. In order to exactly investigate the hydrodynamic motions and structural behavior of the hybrid floating structure under the wave loadings, integrated analysis of hydrodynamic and structural behavior were carried out on the hybrid floating structure. Firstly, the hydrodynamic analyses were performed on the hybrid and pontoon models. Then, the wave-induced hydrodynamic pressures resulting from hydrodynamic analysis were directly mapped to the structural analysis model. And, finally, the structural analyses were carried out on the hybrid and pontoon models. As a result of this study, it was learned that the hybrid model of this study was showed to have more favorable hydrodynamic motions than the pontoon model. The surge motion was indicated even smaller motion at all over wave periods from 4.0 to 10.0 sec, and the heave and pitch motions indicated smaller motions beyond its wave period of 6.5 sec. However, the hybrid model was shown more unfavorable structural behavior than the pontoon model. High concentrated stress occurred at the bottom slab of the bow and stern part where the cylinder wall was connected to the bottom slab. Also, the hybrid model behaved with the elastic body motion due to weak stiffness of floating body and caused a large stress variation at the pure slab section between the cylinder walls. Hence, in order to overcome these problems, some alternatives which could be easily obtained from the simple modification of structural details were proposed.

키워드

과제정보

연구 과제번호 : Development of construction technology for concrete floated offshore infrastructures

참고문헌

  1. Alexia, A., Wendy, S.R., Dominique, R., Patri, F. and Wayne, G. (2010), "Feability and design of the clubstead: a cable-stayed floating structure for offshore dwellings", Proceedings of the 29th International Conference on Ocean, Offshore and Arctic Engineering: OMAE2010-20268, Shanghai, China.
  2. Allen, E., Dees, D., Hicks, S., Hollibaugh, R., Martin, T. and Starling, T. (2006), Design of a floating production storage and offloading vessel for offshore Indonesia-final report, Texas A&M University.
  3. ANSYS (2010), ANSYS AQWA User's Manual, ANSYS Inc. PA.
  4. Cheetham, P., Du, S., May, R. and Smith, S. (2007), "Hydrodynamic analysis of ships side by side in waves", Proceedings of the International Aerospace CFD Conference, Paris, France.
  5. Choi, Y.R., Hong, S.Y., and Choi, H.S. (2011), "An analysis of second-order wave forces on floating bodies by using higher-order boundary element method", Ocean Eng., 28(1), 117-138.
  6. Clauss, G.F., Sprenger, F., Testa, D., Hoog, S. and Huhn, R. (2009), "Motion behaviour of a new offshore LNG transfer system at harsh operational conditions", Proceedings of the 28th International Conference on Ocean, Offshore and Arctic Engineering: OMAE2009-79391, Honolulu, USA.
  7. Haveman, C., Parliament, J., Sokol, J., Swenson, J. and Wangner, T. (2006), Design of a Floating Production Storage and Offloading Vessel for Operation in the South China Sea-Final Report, Texas A&M University.
  8. Huang, W. and Moan, T. (2005), "Combination of global still-water and wave load effects for reliability-based design of floating production, storage and offloading (FPSO) Vessels", Appl. Ocean Res., 27, 127-141. https://doi.org/10.1016/j.apor.2005.11.006
  9. Jeong, Y.J., Cho, J.Y., You, Y.J. and Na, S.W. (2010), "Stability and wave-induced bending moment for design of offshore floating terminal", Proceedings of the 9th Pacific Structural Steel Conference 2010, Beijing, China, 369-374.
  10. Jeong, Y.J., Lee, D.H., Park, M.S. and You, Y.J. (2012), "Hydrodynamic and oscillatory motions of hybrid floating structures with cylinders", Proceedings of the IEEE-OCEANS2012: OCEANS120612-002, Virginia Beach, USA.
  11. Jeong, Y.J. and You, Y.J. (2011), "Experimental study for wave-induced hydrodynamic pressure subjected to bottom of floating structures", Proceedings of the IEEE-OCEANS 2011, Santander, Spain.
  12. Kim, K.T. (2011), Hydroelastic Analysis of Three Dimensional Floating Structures, MS.c. Thesis, KAIST, Korea.
  13. Koutandos, E.V., Karambas, T.V. and Koutitas, C.G. (2004), "Floating breakwater response to waves action using a boussinesq model coupled with a 2D velliptic solver", J. Waterway Port. Coastal, Ocean Eng. - ASCE, 130(5), 243-255. https://doi.org/10.1061/(ASCE)0733-950X(2004)130:5(243)
  14. Lanquetin, B., Collet, P. and Esteve, J. (2007), "Structural integrity management for a large prestressed concrete floating production unit", Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering: OMAE2007-29535, San Diego, USA.
  15. Lee, D.H. and Jeong, Y.J. (2011), "Integrated analysis of hydrodynamic motions and structural behavior of large-scaled floating structures using AQWA-ANSYS coupling (In Korean)", Comput. Struct. Eng. Korea, 130, 243-255.
  16. Link, R.A. and Elwi, A.E. (1995), "Composite concrete-steel plate walls: analysis and behavior", J. Struct. Eng. - ASCE, 121(2), 260-271. https://doi.org/10.1061/(ASCE)0733-9445(1995)121:2(260)
  17. Palo, P. (2005), "Mobile offshore base: hydrodynamic advancements and remaining challenges", Mar. Struct., 18(2), 133-147. https://doi.org/10.1016/j.marstruc.2005.07.007
  18. Park, M.S., Koo, W.C. and Choi, Y.R. (2010), "Hydrodynamic interaction with an array of porous circular cylinders", Int. J. Naval Architect. Ocean Eng., 2(3), 146-154. https://doi.org/10.3744/JNAOE.2010.2.3.146
  19. Park, M.S., Koo, W.C. and Kawana, K. (2012), "Numerical analysis of the dynamic response of an offshore platform with a pile-soil foundation system subjected to random waves and currents", J. Waterway Port. Coastal. Ocean Eng. - ASCE, 138( 4), 275-285. https://doi.org/10.1061/(ASCE)WW.1943-5460.0000133
  20. Pena, E., Ferreras, J. and Sanchez-Tembleque, F. (2011), "Experimental study on wave transmission coefficient, mooring lines and module connector forces with different designs of floating breakwaters", Ocean Eng., 38(10), 1150-1160. https://doi.org/10.1016/j.oceaneng.2011.05.005
  21. Pham, D.C. and Wang, C.M. (2010), "Optimal layout of gill cells for very large floating structures", J. Struct. Eng. - ASCE, 136(7), 907-916. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000182
  22. Yao, Z. (2007), Very Large Floating Container Terminal and Optimal Layout of GillCells, MS.c. Thesis, National University of Singapore.