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Approximation of Surge and Pitch Loads on Truncated Vertical Cylinders

[+] Author Affiliations
Hoi-Sang Chan, Martin Downie, Atilla Incecik, Keyvan Sadeghi

University of Newcastle, Newcastle upon Tyne, UK

Paper No. OMAE2003-37369, pp. 559-566; 8 pages
  • ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 1: Offshore Technology; Ocean Space Utilization
  • Cancun, Mexico, June 8–13, 2003
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3681-9 | eISBN: 0-7918-3672-X
  • Copyright © 2003 by ASME


Truncated vertical circular cylinders are used to make deep water floating offshore platforms like Truss Spars. When the draft of the cylindrical hull is not deep enough, prediction of the surge and pitch diffraction loads by integration of McCamy and Fuchs expression of the force per unit length over the cylinder draft causes an error which is not negligible. Using hydrodynamic arguments the approximated surge and pitch loads by McCamy and Fuchs diffraction theory are modified. The modified results are compared with the results of a parametric study using the computer program WaMIT 4.01 based on the linear diffraction theory, reported by Weggel [1].

Copyright © 2003 by ASME



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