Heave response of classic spar with variable geometry

Longbin Tao, Kay Yeong Lim, Krish Thiagarajan

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


Spar platforms with cylindrical shape and constant cross-section area may experience resonant heave motions in sea states with long peak periods, which are probably excessive for riser integrity due to its low damping and relatively low natural heave period. Changes to hull shape and cross-section that produce more benign heave behavior were discussed by some researchers in the past. In this study, the viscous damping of spar structures is explicitly calculated, and incorporated to the potential solution. It is concluded that the heave resonant response con be considerably reduced by alternative hull shapes via increased damping mechanism and the natural heave period being kept outside the range of the wave energy.

Original languageEnglish
Pages (from-to)90-95
Number of pages6
JournalJournal of Offshore Mechanics and Arctic Engineering
Issue number1
Publication statusPublished - Feb 2004


  • heave response
  • resonant heave motions
  • viscous damping
  • spar structure


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