Journal of Marine Science and Technology

, Volume 8, Issue 3, pp 126–137 | Cite as

Response analysis of a truss spar in the frequency domain



The nonzero added-mass coefficients of a platform are found by using the transformation law for a second-order tensor, and the repeated application of the parallel-axes theorem. The excitation forces acting on the truss section of the platform are derived by an approach that differs from the conventional one commonly seen in the literature. The force decomposition of the Morison equation is used to add viscous effects to linear equations of motion. The nonlinear equation of motion for the heave of the truss spar is solved without any iteration in the frequency domain. The results obtained from this analysis are compared with results obtained from the conventional numerical approach and with experimental data.

Key words

Truss spars Response analysis Tensor properties Viscous radiation-diffraction model 


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Copyright information

© Springer-Verlag Tokyo 2004

Authors and Affiliations

  • Keyvan Sadeghi
    • 1
  • Atilla Incecik
    • 1
  • Martin J. Downie
    • 1
  1. 1.School of Marine Science and TechnologyUniversity of Newcastle upon TyneUK

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