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Time Domain Analysis of Roll Response Considering Slowly Varying Nonlinear Excitation

  • Kim, Deok-Hun (School of Naval Architecture and Ocean Engineering, University of Ulsan) ;
  • Choi, Yoon-Rak (School of Naval Architecture and Ocean Engineering, University of Ulsan)
  • Received : 2016.03.20
  • Accepted : 2016.05.31
  • Published : 2016.06.30

Abstract

Nonlinear wave loads can lead to resonant responses of offshore structures in sum or difference frequencies. In this study, the roll motion of an FPSO with a low natural frequency is simulated in the time domain. To generate the time signals of wave loads, the quadratic transfer functions of the second-order excitations are calculated in the frequency domain. The equations of motions based on the time memory functions are used to evaluate the roll responses in irregular waves. The roll damping in empirical form is accounted for in the simulation.

Keywords

References

  1. Choi, Y.R. and Hong, S.Y. (2002). "An Analysis of Hydrodynamic Interaction of Floating Multi-Body Using Higher-Order Boundary Element Method", Proc 12th Int. Offshore and Polar Eng Conference, ISOPE, Kita-Kyushu, pp 303-308.
  2. Cummins, W.E. (1962). The Impulse Response Function and Ship Motions (No. DTMB-1661). David Taylor Model Basin Washington DC.
  3. Choi, Y.R., Kim, J.H., & Kim, Y.S. (2005). "An Analysis of Rolling Performance for a Barge-Type FPSO", Journal of Ocean Engineering and Technology, 19(3), pp 25-30.
  4. Pinkster, J.A. (1980). Low Frequency Second Order Wave Exciting Forces on Floating Structures, Doctoral dissertation, TU Delft, Delft University of Technology.