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Frequency domain analysis of Froude-Krylov and diffraction forces on TLP

  • Malayjerdi, Ebrahim (Mechanical Engineering Department, Sharif University of Technology) ;
  • Tabeshpour, Mohammad Reza (Mechanical Engineering Department, Center of Excellence in Hydrodynamics and Dynamics of Marine Vehicles, Sharif University of Technology)
  • 투고 : 2016.04.28
  • 심사 : 2016.08.30
  • 발행 : 2016.09.25

초록

Tension Leg Platform (TLP) is a floating structure that consists of four columns with large diameter. The diffraction theory is used to calculate the wave force of floating structures with large dimensions (TLP). In this study, the diffraction and Froude-Krylov wave forces of TLP for surge, sway and heave motions and wave force moment for roll, pitch degrees of freedom in different wave periods and three wave approach angles have been investigated. From the numerical results, it can be concluded that the wave force for different wave approach angle is different. There are some humps and hollows in the curve of wave forces and moment in different wave periods (different wavelengths). When wave incidents with angle 0 degree, the moment of diffraction force for pitch in high wave periods (low frequencies) is dominant. The diffraction force for heave in low wave periods (high wave frequencies) is dominant. The phase difference between Froude-Krylov and diffraction forces is important to obtain total wave force.

키워드

참고문헌

  1. Chaplin, J.R. (1984), "Nonlinear forces on a horizontal cylinder beneath waves", J. Fluid Mech., 147, 449-464. https://doi.org/10.1017/S0022112084002160
  2. Drake, K.R. (2011), "An analytical approximation for the horizontal drift force acting on a deep draught spar in regular waves", Ocean Eng., 38(5), 810-814. https://doi.org/10.1016/j.oceaneng.2011.02.003
  3. Ghadimi, P., Bandari, H.P. and Rostami, A.B. (2012), "Determination of the heave and pitch motions of a floating cylinder by analytical solution of its diffraction problem and examination of the effects of geometric parameters on its dynamics in regular waves", Int. J. Appl. Math. Res., 1(4), 611-633.
  4. Gudmestad, O.T and Moe, G. (1996), "Hydrodynamic coefficients for calculation of hydrodynamic loads on offshore truss structures", Mar. Struct., 9(8), 745-758. https://doi.org/10.1016/0951-8339(95)00023-2
  5. Joseph, A., Mangal, L. and George, P.S. (2010), "Coupled dynamic response of a three-column mini TLP", J. Naval Architect. Marine Eng., 6(2), 52-61.
  6. Kunisu, H. (2010), "Evaluation of wave force acting on submerged floating tunnels", Procedia Eng., 4, 99-105. https://doi.org/10.1016/j.proeng.2010.08.012
  7. Tabeshpour, M.R. and Malayjerdi, E. (2016), "Investigation of the pitch motion portion in vertical response at sides of TLP", J. Marine Sci. Appl., 15(2), 1-7. https://doi.org/10.1007/s11804-016-1343-0
  8. Tabeshpour, M.R., Ataie Ashtiani, B., Seif, M.S. and Golafshani, A.A. (2013), "Hydrodynamic damped pitch motion of tension leg platforms", Int. J. Marine Sci. Eng., 3(2), 91-98.
  9. Tabeshpour, M.R., Golafshani, A.A., Ashtiani, B.A. and Seif, M.S. (2006), "Analytical solution of heave vibration of tension leg platform", J. Hydrology Hydromech., 54(3), 280-289.
  10. Veritas, D.N. (2005), Guidelines on design and operation of wave energy converters, Carbon Trust.
  11. Wu, H.L., Chen, X.J., Huang, Y.X. and Wang, B. (2014), "Influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure", Ships Offshore Struct., 9(6), 578-595. https://doi.org/10.1080/17445302.2013.867646
  12. Yang, M., Teng, B., Ning, D. and Shi, Z. (2012), "Coupled dynamic analysis for wave interaction with a truss spar and its mooring line/riser system in time domain", Ocean Eng., 39, 72-87. https://doi.org/10.1016/j.oceaneng.2011.11.002
  13. Zeng, X.H., Shen, X.P. and Wu, Y.X. (2007), "Governing equations and numerical solutions of tension leg platform with finite amplitude motion", Appl. Math. Mech., 28, 37-49. https://doi.org/10.1007/s10483-007-0105-1

피인용 문헌

  1. Perturbation nonlinear response of tension leg platform under regular wave excitation 2017, https://doi.org/10.1007/s00773-017-0461-y
  2. Aerodynamic behaviour of double hinged articulated loading platforms vol.11, pp.1, 2021, https://doi.org/10.12989/ose.2021.11.1.017