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Incorporating magneto-Rheological damper into riser tensioner system to restrict riser stroke in moderate-size semisubmersibles

Zainuddin, Zaid   (Department of Ocean Engineering, Texas A&M University  ); Kim, Moo-Hyun   (Department of Ocean Engineering, Texas A&M University  ); Kang, Heon-Yong   (Department of Ocean Engineering, Texas A&M University  ); Bhat, Shankar   (Department of Civil, Structures and Offshore, Sabah Shell Petroleum Co. Ltd.  );
  • 초록

    In case of conventional shallow-draft semisubmersibles, unacceptably large riser stroke was the restricting factor for dry-tree-riser-semisubmersible development. Many attempts to address this issue have focused on using larger draft and size with extra heave-damping plates, which results in a huge cost increase. The objective of this paper is to investigate an alternative solution by improving riser systems through the implementation of a magneto-rheological damper (MR Damper) so that it can be used with moderate-size/draft semisubmersibles. In this regard, MR-damper riser systems and connections are numerically modeled so that they can couple with hull-mooring time-domain simulations. The simulation results show that the moderate-size semisubmersible with MR damper system can be used with conventional dry-tree pneumatic tensioners by effectively reducing stroke-distance even in the most severe (1000-yr) storm environments. Furthermore, the damping level of the MR damper can be controlled to best fit target cases by changing input electric currents. The reduction in stroke allows smaller topside deck spacing, which in turn leads to smaller deck and hull. As the penalty of reducing riser stroke by MR damper, the force on the MR-damper can significantly be increased, which requires applying optimal electric currents.


  • 주제어

    semisubmersible  . dry-tree unit  . TTR (top-tensioned riser)  . MR (magneto-rheological) damper  . pneumatic tensioner  . riser-stroke limit  . active control  . deepwater  .

  • 참고문헌 (14)

    1. American Petroleum Institute (2007), API 2INT-MET: Interim Guidance on Hurricane Conditions in the Gulf of Mexico. Washington D.C., United States of America: API Publishing Services. 
    2. Bitaraf, M., Ozbulut, O.E., Hurlebaus, S. and Barroso, L. (2009), "Application of semi-active control strategies for seismic protection of buildings with MR dampers", Eng. Struct., 32, 3040-3041. 
    3. Chen, C.Y., Mei, X. and Mills, T. (2007), "Effect of heave plate on semisubmersible response", International Offshore and Polar Engineering Conference Proceedings of the Sixteenth (2007) on 1-6 Jul 2007, Lisbon: The International Society of Offshore and Polar Engineers(ISOPE). 
    4. Kang, H.S., Bhat, S., Kim, M.H. and Kang, H.Y. (2014), "Dynamic response control of top-tension risers by a variable damping and stiffness with magneto-Rheological damper", International Conference on Ocean, Offshore and Artic Engineering, San Francisco: ASME. Retrieved June 2016. 
    5. Kang, H.S., Kim, M.H. and Bhat, S. (2017), "Tension variations of hydro-pneumatic riser tensioner and implications for dry-tree interface in semisubmersible", Ocean Syst. Eng., 7(1), 21-38. 
    6. Kang, H.Y. and Kim, M.H. (2014), "Safety assessment of Caisson transport on a floating dock by frequencyand time-domain calculations", Ocean Syst. Eng., 4(2), 99-115. 
    7. Kwok, N., Ha, Q., Nguyen, T., Li, J. and Samali, B. (2006), A novel hysteretic model for magnetorheological fluid dampers and parameter identification using particle swarm optimization, 441-451. Retrieved June 2016 
    8. Muehlner, E. and Banumurthy, S. (2015), "Low-heave semi-submersible enabling dry-tree field development", Offshore Technology Conference Proceedings - OTC-25666-MS on 4-7 May 2015, Houston: Offshore Technology Conference. 
    9. Sablok, A., Edelson, D., Kim, J. and Luo, M. (2011), Extended Draft Semisubmersible. Society of Petroleum Engineers. Macae: Society of Petroleum Engineers. Retrieved November 2018 
    10. Wang, D. and Liao, W. (2011), Magnetorheological Fluid Dampers: a Review of Parameteric Modelling. Smart Material and Structures. 
    11. Yang, C. and Kim, M.H. (2009), "Linear and nonlinear approach of hydropneumatic tensioner modeling for spar global performance", J. Offshore Mech. Arct., 132(1), 011601. 
    12. Yang, C. and Kim, M.H. (2010), "Transient effects of tendon disconnection of a TLP by hull-tendon-riser coupled dynamic analysis", Ocean Eng., 37(9), 667-677. 
    13. Yang, M.G., Li, C.Y. and Chen, Z.Q. (2013), "A new simple non-linear hysteretic model for MR damper and verification of seismic response reduction experiment", Eng. Struct., 52, 434-445. 
    14. Zainuddin, M. (2017), Application of magneto-rheological damper for riser tensioner system to reduce stroke, Master Thesis, Texas A&M University, College Station, USA. 

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