Ocean Systems Engineering

  • 제14권3호
  • /
  • Pages.277-299
  • /
  • 2024
  • /
  • 2093-6702(pISSN)
  • /
  • 2093-677X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Experimental and numerical study on motion responses of modular floating structures with connectors in waves

  • Dong-Hee Choi (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Jae-Min Jeon (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Min-Ju Maeng (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Jeong-Hyeon Kim (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Bo Woo Nam (Department of Naval Architecture and Ocean Engineering, Seoul National University)
  • 투고 : 2024.06.15
  • 심사 : 2024.09.13
  • 발행 : 2024.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

In this study, the wave-induced motion responses of modular floating structures (MFS) was investigated through a series of experiments in a two-dimensional wave tank. A 1:63 scale model test was conducted using a 1-by-2 modular floating structure consisting of two modules and connectors. Two different types of connectors were considered: a pitch-free hinge and rigid connector. The numerical analysis was performed based on the higher-order boundary element method (HOBEM) and wave Green function with potential flow theory. First, the heave and pitch RAOs of the modules from the regular wave tests were directly compared with numerical analysis results. Next, the motion spectra and their statistical values from the irregular wave tests were compared with the numerical analysis results. The study revealed that the sheltering effect of the weather side module led to a reduction in motion of the lee side module. The numerical analysis showed good agreement with the experimental data, demonstrating the validity of the numerical method. Additionally, the rigid connector, which strongly constrain all six degrees of freedom, significantly reduce pitch motion, making the modules behave as a single rigid body.

키워드

과제정보

This research was supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant RS-2023-00250727) through the Korea Floating Infrastructure Research Center at Seoul National University.

참고문헌

  1. Bargeco, A. (1985), "Securing of marine platforms in rough sea", Recent Pat. Eng., 104. 
  2. Choi, Y.R. and Hong, S.Y. (2002), "An analysis of hydrodynamic interaction of floating multi-body using higher-order boundary element method", Proceedings of the 12th International Offshore and Polar Engineering Conference, Kitakyushu, Japan. 
  3. Choi, Y.R., Hong, S.Y. and Choi, H.S. (2001), "An analysis of second-order wave forces on floating bodies by using a higher-order boundary element method", Oceanic Eng., 28(1), 117-138. https://doi.org/10.1016/S0029-8018(99)00064-5. 
  4. Crema, I. (2017), Oscillating water column wave energy converters integrated in very large floating structures. 
  5. Derstine, M.S. and Brown, R.T. (2000), "A compliant connector concept for the mobile offshore base", Mar. Struct., 13(4-5), 399-419. https://doi.org/10.1016/S0951-8339(00)00017-4.
  6. Ding, J., Wu, Y.S., Zhou, Y., Ma, X.Z., Ling, H.J. and Xie, Z. (2020), "Investigation of connector loads of a 3-module VLFS using experimental and numerical methods", Ocean Eng., 195, 106684. https://doi.org/10.1016/j.oceaneng.2019.106684. 
  7. Dong, G., Mao, Y., Wu, Y., Ma, X., Yuan, F., Lu, X. and Zhang, L. (2024), "Experimental study on the hydrodynamic performance of a flexible connected double-module floating structure", J. Offshore Mech. Arct. Eng., 146(5). https://doi.org/10.1115/1.4064537. 
  8. Haney, J. (1999), "Mob connector development", Proceedings of the 3rd International Workshop on Very Large Floating Structures. 
  9. Huang, H., Chen, X.J., Liu, J.Y., Miao, Y.J. and Ji, S. (2021), "A method to estimate dynamic responses of VLFS based on multi-flating0module model connected by elastic hinges", China Ocean Eng., 35(5), 687-699. https://doi.org/10.1007/s13344-021-0061-9. 
  10. Ikoma, T., Masuda, K., Watanabe, Y., Eto, H., Theem, C.K. and Kinoshita, T. (2015), "Power generation potential of a VLFS equipped with OWC type WECs and damper effects on elastic motion", Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering. 
  11. Isobe, E. (1999), "Research and development of Mega-Float", Proceedings of the 3rd International Workshop on Very Large Floating Structures. 
  12. Jiang, C., Xu, P., Bai, X., Zhao, Z., el Moctar, O. and Zhang, G. (2023), "A review of advances in modelling hydrodynamics and hydroelasticity for very large floating structures", Ocean Eng., 285, 115319. https://doi.org/10.1016/j.oceaneng.2023.115319. 
  13. Jiang, D., Tan, K.H., Wang, C.M. and Dai, J. (2021), "Research and development in connector systems for very large floating structures", Ocean Eng., 232, 109150. https://doi.org/10.1016/j.oceaneng.2021.109150. 
  14. Koekoek, M. (2010), Connecting modular floating structures: A general survey and structural design of a modular floating Pavilion (Master's thesis). TU Delft. 
  15. Lee, D.H. and Choi, H.S. (1998), "The motion behavior of shuttle tanker connected to a turret-moored FPSO", Proceedings of the 3rd Int'l Conf on Hydrodynamics. 
  16. Lee, D.H. and Choi, H.S. (1998), "The motion behavior of shuttle tanker connected to a turret-moored FPSO", Proceedings of the 3rd Int'l Conference on Hydrodynamics. 
  17. Li, Y., Ren, N., Li, X. and Ou, J. (2022), "Hydrodynamic analysis of a novel modular floating structure system integrated with floating artificial reefs and wave energy converters", J. Mar. Sci. Eng., 10(8), 1091. https://doi.org/10.3390/jmse10081091. 
  18. Liu, Y.H., Kim, C.H. and Lu, X.S. (1990), "Comparison of higher-order boundary element and constant panel methods for hydrodynamic loadings", J. Offshore Polar Eng., 1(1), 8-17. 
  19. McAllister, K.R. (1997), "Mobil offshore bases-an overview of recent research", J. Mar. Sci. Technol., 2, 173-181. https://doi.org/10.1007/BF02489808. 
  20. Nagai, B.M., Ameku, K., Nagai, Y. and Izumikawa, T. (2006), "Mooring method of very large floating structure", Proceedings of the 16th International Offshore and Polar Engineering Conference, OnePetro. 
  21. Nam, B.W. and Hong, S.Y. (2021), "Eigenvalue analysis for motion response of a TLP and tender semi considering a complex mooring configuration", Int. J. Offshore Polar Eng., 31(2), 169-177. https://doi.org/10.17736/ijope.2021.mm26. 
  22. Newman, J.N., 2018. Marine Hydrodynamics. The MIT Press. 
  23. Otto, W.J., Waals, O.J., Bunnik, T.H.J. and Ceneray, C. (2020), "Wave induced motions of a floating mega island", Proceedings of the WCFS2019 World Conference on Floating Solutions. 
  24. Otto, W.J., Waals, O.J., Bunnik, T.H.J. and Cresp, J. (2019), "Optimization of wave induced motions and forces on a floating island", Proceedings of the ISOPE International Ocean Polar Engineering Conference. 
  25. Riggs, H. and Ertekin, R. (1993), "Approximate methods for dynamic response of multi-module floating structures", Mar. Struct., 6(2-3), 117-141. 
  26. Shi, Q.J., Zhang, H.C., Xu, D.L., Qi, E.R., Tian, C., Ding, J., Wu, Y.S., Lu, Y. and Li, Z.W. (2018), "Experimental validation of network modelling method on a three-modular floating platform model", Coast. Eng., 137, 92-102. https://doi.org/10.1016/j.coastaleng.2018.04.001. 
  27. Song, B. (2012), "Research on the connector of very large floating offshore base", J. Ship Mech., 7, 829-837. 
  28. Storm, W. (2016), Public Space in the Making: A Rotterdam Experiment. Streetnotes, 25. 
  29. Waals, O.J., Bunnik, T.H.J. and Otto, W.J. (2018), "Model tests and numerical analysis for a floating meta island", Proceedings of the 37th International Conference on Ocean, Offshore & Arctic Engineering. 
  30. Wang, C.M. and Tay, Z.Y. (2011), "Very large floating structures: applications, research and development", Procedia Eng., 14, 62-72. 
  31. Wu, G., Shen, Q., Chen, X. and Wu, P. (2003), "Influence of the distance between floating bodies on hydrodynamic coefficients of floating multi-body system", Ocean Eng., 21(4), 29-34. 
  32. Wu, Y.S., Ding, J., Tian, C., Li, Z.W., Ling, H.J., Ma, X.Z. and Gao, J.L. (2018), "Numerical analysis and model tests of a three-module VLFS deployed near islands and reefs", J. Ocean Eng. Mar. Energ., 4, 111-122. https://doi.org/10.1007/s40722-018-0112-3. 
  33. Xu, D., Zhang, H., Qi, E., Hu, J. and Wu, Y. (2014), "On study of nonlinear network dynamics of flexibly connected multi-module very large floating structures", In Vulnerability, Uncertainty and Risk: Quantification, Mitigation, and Management. American Society of Civil Engineers, 1805-1814. 
  34. Yun, J. (2019), "A copy is (not a simple) copy: Role of urban landmarks in branding Seoul as a global city", Front. Architect. Res., 8(1), 44-54. https://doi.org/10.1016/j.foar.2018.12.005. 
  35. Zhang, C., Dai, J., Ang, K.K. and Lim, H.V. (2024), "Development of compliant modular floating photovoltaic farm for coastal conditions", Renew. Sustain. Energ. Rev.. 190, 114084. https://doi.org/10.1016/j.rser.2023.114084. 
  36. Zhang, X., Lu, D., Liang, Y. and Brennan, F. (2021), "Feasibility of very large floating structure as offshore wind foundation: effects of hinge numbers on wave loads and induced responses", J. Waterw. Port, Coast. Ocean Eng., 147(3), 04021002. https://doi.org/10.1061/(ASCE)WW.1943-5460.0000626. 
  37. Zhu, X. (2015), Design and finite element analysis for very large floating structure flexible connector (Master's thesis), Shanghai Jiaotong University.