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A Study on Unstable Motions of a Tension Leg Platform in Close Proximity to a Large FPSO

  • Luis Alberto Rivera
  • Marcelo A. S. NevesEmail author
  • Roberto E. Cruz
  • Paulo de Tarso T. Esperança
Chapter
Part of the Fluid Mechanics and Its Applications book series (FMIA, volume 119)

Abstract

The present paper elaborates on model experimental results obtained from tests conducted with a TLP connected to a nearby positioned FPSO. The tests revealed, at a given range of wave periods, the onset of unexpected large oscillatory yaw motions of the platform whereas the FPSO remained rather stable when the TLP was directly excited in sway. The paper summarizes the model experiments emphasizing the types of coupled motions taking place. It is observed that as the yaw motion develops increasing amplitudes the sway motion is reduced, pointing out to an interesting exchange of energy between the sway and yaw modes. A mathematical model is proposed to describe the main aspects of the two-body moored system. In principle a 12 DOF model is contemplated. Numerical simulations are compared to the time series obtained from the experiments showing adequate agreement.

Keywords

Parametric resonance Non-linear coupling Tension leg wellhead platform 

References

  1. Cruz, R.E., Neves, M.A.S., Rivera, L.A. and Esperança, P.T.T., 2012, “An Investigation on the Excitation of Yaw Parametric Resonance of a Tension Leg Platform”, Paper OMAE2012-83574, Rio de Janeiro, June 2012.Google Scholar
  2. De Conti, M., Andrade, B. and Birk, L., 2009, “Differentiation between the Lower and Upper Parts of Columns of a Semi-Submersible for Heave Response Improvement”. Marine Systems & Ocean Technology, Vol 4, No 2, pp. 63–72.Google Scholar
  3. Maeda, K., Uto, S., Kuroda, T. 2008,” TLWP-FPSO coupled model tests in NMRI”, National Maritime Research Institute, Japan, Report OCN-07-03.Google Scholar
  4. Neves, M.A.S., Rodríguez, C.A. (2007) “Influence of Nonlinearities on the Limits of Stability of Ships Rolling in Head Seas”. Ocean Engineering, Vol 34, pp. 1618–1630.CrossRefGoogle Scholar
  5. Rodríguez, C.A. and Neves, M.A.S., 2012, “Domains of Parametric Roll Amplification for Different Hull Forms”. In: Parametric Resonance in Dynamical Systems, Chapter 6, Ed.: T.I. Fossen and H. Nijmeijer, Springer Science, New York.Google Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Luis Alberto Rivera
    • 1
  • Marcelo A. S. Neves
    • 1
    Email author
  • Roberto E. Cruz
    • 1
  • Paulo de Tarso T. Esperança
    • 1
  1. 1.COPPE/UFRJRio de JaneiroBrazil

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