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Hydroelastic Responses of Floating Structure by Modeling Dimensions

부유구조물의 모델링 차원에 따른 유탄성 응답

Hong, Sanghyun;Hwang, Woongik;Lee, Jong Seh
홍상현;황웅익;이종세

  • Received : 2016.05.23
  • Accepted : 2016.06.09
  • Published : 2016.06.30

Abstract

In this study, FE-BE direct coupling methods of 1D and 2D problems are considered for the pontoon-type floating structure and the difference of the modeling dimensions is investigated for the hydroelastic response. The modeling dimensions are defined as the 1D problem consisting 1D beam-2D fluid coupling and the 2D problem consisting 2D plate-3D fluid coupling with zero-draft assumption. For case studies, hydroelastic responses of the 1D Problem are compared to those of the 2D Problem for a wide range of aspect ratio and regular waves. It is shown that the effects of the elastic behavior are increased by decreasing the incident wavelength, whereas the effects of the rigid behavior are increased by increasing the incident wavelength. In 2D problem, the incident wave angle can be considered, and slightly more accurate results can be obtained, but the computational efficiency is lower. On the other hand, in 1D problem with plate-strip condition, the incident wave angle cannot be considered, but when the aspect ratio is large, the overall responses can be analyzed through a simplified model, and the computational efficiency can be improved.

Keywords

floating structure;hydroelastic analysis;modeling dimension;euler-bernoulli beam;kirchhoff plate

References

  1. Bishop, R.E.D., Price, W.G. (1979) Hydroelasticity of Ships, Cambridge University Press, New York.
  2. Georgiadis, C. (1985) Finite Element Modeling of the Response of Long Floating Structures under Harmonic Excitation, J. Energ. Resour.-ASME, 107(1), pp.48-53. https://doi.org/10.1115/1.3231162
  3. Hermans, A.J. (2001) A Geometrical-optics Approach for the Deflection of a Floating Flexible Platform, Applied Ocean Research, 23(5), pp.269-276. https://doi.org/10.1016/S0141-1187(01)00024-4
  4. Hong, S., Lee, J.S. (2016) Hydroelastic Response Analysis of Pneumatically Supported Floating Structures Using a BEM-FEM Coupling Method, KSCE J. Civ. Eng., Online Publish, pp.1-10.
  5. Hong, S.Y. (2008) Development of Design Technology of Very Large Floating Structures, Final Research Report UCPM0139A-37-2, Ministry of Oceans and Fisheries.
  6. John, F. (1950) On the Motion of Floating Bodies II. Simple Harmonic Motions, Comm. Pure & Appl. Math., 3(1), pp.45-101. https://doi.org/10.1002/cpa.3160030106
  7. Khabakhpasheva, T.I., Korobkin, A.A. (2002) Hydroelastic Behaviour of Compound Floating Plate in Waves, J. Eng. Math., 44(1), pp.21-40. https://doi.org/10.1023/A:1020592414338
  8. Newman, J.N. (1985) Algorithms for the Free-s urface Green function, J. Eng. Math., 19(1), pp.57-67. https://doi.org/10.1007/BF00055041
  9. Song, H., Peng, X.-n., Sun, H., Cui, W.-c., Liu, Y.z. (2003) On Beam-on-elastic-foundation (BOEF) Model for the Hydroelastic Response Analysis of Mat-like VLFS, J. Ship Mech., 7(6), pp.116-129.
  10. Suzuki, H., Bhattacharya, B., Fujikubo, M., Hudson, D.A., Riggs, H.R., Seto, H., Shin, H., Shugar, T.A., Yasuzawa, Y., Zong, Z. (2006) ISSC Committee VI.2: Very Large Floating Structures, Proc. 16th Int. Ship & Offshore Struct. Congress, Southampton, UK, pp.391-442.
  11. Taylor, R.E. (2007) Hydroelastic Analysis of Plates and Some Approximations, J. Eng. Math., 58(1), pp.267-278. https://doi.org/10.1007/s10665-006-9121-7
  12. Utsunomiya, T., Watanabe, E., Wu, C., Hayashi, N., Nakai, K., Seika, K. (1995) Wave Response Analysis of a Flexible Floating Structure by BE-FE Combination Method, Proc. 5th Int. Offshore & Polar Eng. Conf., pp.400-405.
  13. Wang, C.D., Meylan, M.H. (2004) A Higher-ordercoupled Boundary Element and Finite Element Method for the Wave Forcing of a Floating Elastic Plate, J. Fluid. & Struct., 19(4), pp.557-572. https://doi.org/10.1016/j.jfluidstructs.2004.02.006
  14. Yago, K., Endo, H. (1996) On the Hydroelastic Response of Box-shaped Floating Structure with Shallow Draft (Tank Test with Large Scale Model), J. Soc. Naval Arch. Japan, 180, pp.341-352.
  15. Zi, G., Kim, J.G., Lee, S.O., Lee, P.-S. (2010) Development of a Design Chart for the Initial Design Stage of Very Large Floating Structures, J. Korean Soc. Civ. Eng., 30(3B), pp.315-324.

Acknowledgement

Supported by : 국토교통부