Ocean Systems Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Safety assessment of caisson transport on a floating dock by frequency- and time-domain calculations

  • Kang, H.Y. (Ocean Engineering Program, Department of Civil Engineering, Texas A&M University) ;
  • Kim, M.H. (Ocean Engineering Program, Department of Civil Engineering, Texas A&M University)
  • Received : 2014.01.09
  • Accepted : 2014.05.28
  • Published : 2014.06.25
⟨ Previous Next ⟩

Abstract

When caissons are mounted on a floating transportation barge and towed by a tug boat in waves, motion of the floating dock creates inertia and gravity-induced slip forces on the caisson. If its magnitude exceeds the corresponding friction force between the two surfaces, a slip may occur, which can lead to an unwanted accident. In oblique waves, both pitch and roll motions occur simultaneously and their coupling effects for slip and friction forces become more complicated. With the presence of strong winds, the slip force can appreciably be increased to make the situation worse. In this regard, the safety of the transportation process of a caisson mounted on a floating dock for various wind-wave conditions is investigated. The analysis is done by both frequency-domain approach and time-domain approach, and their differences as well as pros and cons are discussed. It is seen that the time-domain approach is more direct and accurate and can include nonlinear contributions as well as viscous effects, which are typically neglected in the linear frequency-domain approach.

Keywords

References

  1. Kang, H.Y., Kim, M.H., Kim, J.H., Park, W.S. and Chae, J.W. (2010), "On/offloading from both sides of a super container ship to land and floating harbor", Proceedings of the 20th International Offshore and Polar Engineering Conference, Peking, China.
  2. Kang, H.Y., Kim, M.H., Seok, J., Park, J.C. and Kang, Y.K. (2011), "Safety of caisson transport on a floating dock", Proceedings of the 21th International Offshore and Polar Engineering Conference, Maui.
  3. Kang, H.Y. and Kim, M.H. (2012), "Hydrodynamic interactions and coupled dynamics between a container ship and multiple mobile harbors", Ocean Syst. Eng., 2(3), 217-228. https://doi.org/10.12989/ose.2012.2.3.217
  4. Kim, M.H., Koo, B.J., Mercier, R.M. and Ward, E.G. (2005), "Vessel/mooring/riser coupled dynamic analysis of a turret-moored FPSO compared with OTRC experiment", Ocean Eng., 32, 1780-1802. https://doi.org/10.1016/j.oceaneng.2004.12.013
  5. Kim, M.H., Ran, Z. and Zheng, W. (2001), "Hull/mooring coupled dynamic analysis of a truss spar in time domain", Int. J. Offshore Polar, 11(1), 42-54.
  6. Koo, B.J. and Kim, M.H. (2005), "Hydrodynamic interactions and relative motions of two floating platforms with mooring lines in side-by-side offloading operation", Appl. Ocean Res., 27(6), 295-310.
  7. Lee, C.H., Newman, J.N., Kim, M.H. and Yue, D.K.P. (1991), "The computation of second-order wave loads", Proceedings of the 10th International Offshore Mechanics and Arctic Engineering Conference, Stavanger, Norway.
  8. Ran, Z. (2000), Coupled dynamic analysis of floating structures in waves and currents, Ph.D. Dissertation, Texas A&M University, College Station, TX.
  9. Seok, J., Park, J.C., Heo, J.K., Kang, H.Y., Bae, Y.H., Kim, M.H. and Kang, Y.K. (2010), "Stability evaluation during transportation of caisson for breakwater", J. Ocean Eng. Technol., KSOE, 24(4), 13-22.
  10. Tahar, A. and Kim, M.H. (2003), "Hull/mooring/riser coupled dynamic analysis and sensitivity study of a tanker-based FPSO", Appl. Ocean Res., 25, 367-382. https://doi.org/10.1016/j.apor.2003.02.001
  11. Yang, C.K., Bae, Y.H., Kim, M.H. and Ward, E.G. (2010), "Loads on tie-down systems for floating drilling rigs during hurricane conditions", Int. J. Offshore Polar, ISOPE, 20( 2), 95-102.
  12. Yang, C.K. and Kim, M.H. (2011), "The structural safety assessment of a tie-down system on a tension leg platform during hurricane events", Ocean Syst. Eng., 1(4), 263-283. https://doi.org/10.12989/ose.2011.1.4.263
  13. Zhang, Z., Kim, M.H. and Ward, E.G. (2009), "Progressive mooring-line failure of a deepwater MODU in hurricane conditions", Proceedings of the 28th International Offshore Mechanics and Arctic Engineering Conference, Honolulu.

Cited by

  1. Turret location impact on global performance of a thruster-assisted turret-moored FPSO vol.6, pp.3, 2016, https://doi.org/10.12989/ose.2016.6.3.265
  2. An alternative portable dynamic positioning system on a barge in short-crested waves using the fuzzy control vol.5, pp.3, 2015, https://doi.org/10.12989/ose.2015.5.3.199
  3. Dynamic analysis for the global performance of an SPM-feeder-cage system under waves and currents vol.29, pp.3, 2015, https://doi.org/10.1007/s13344-015-0029-8
  4. Dynamic response analysis of submerged floating tunnels by wave and seismic excitations vol.7, pp.1, 2014, https://doi.org/10.12989/ose.2017.7.1.001
  5. Incorporating magneto-Rheological damper into riser tensioner system to restrict riser stroke in moderate-size semisubmersibles vol.8, pp.2, 2014, https://doi.org/10.12989/ose.2018.8.2.101
  6. Effects of nonlinear FK (Froude- Krylov) and hydrostatic restoring forces on arctic-spar motions in waves vol.12, pp.None, 2014, https://doi.org/10.1016/j.ijnaoe.2020.01.002
  7. The Effect of Reinforcing Plate on the Stiffness of Elastomeric Bearing for FPSO vol.13, pp.24, 2014, https://doi.org/10.3390/en13246640