Simplified time-domain analysis of deep water spar platforms for regular waves
- Univ. of Texas, Austin, TX (United States). Dept. of Civil Engineering
A software package is being developed under the sponsorship of the Offshore Technology Research Center, funded by the National Science Foundation and administered by The University of Texas at Austin and Texas A and M University. It is especially conceived for educational or research purposes with emphasis on user interfaces, automatic data generation and graphical displays. The present version is for the two-dimensional analysis of Spars while the final version is expected to be applicable to the more general three-dimensional problem. The analysis is conducted in the time-domain which allows nonlinearities in the drag term of the hydrodynamic forces from Morison`s equation, in the computation of these forces in the displaced position and in the evaluation of the wave kinematics up to the instantaneous free surface as well as the nonlinear structural response of the mooring to be easily accounted for. The forcing function is a result of waves, wind and current. The deck and Spar hull are assumed rigid with the Spar being supported either by mooring lines or by linear springs attached at the fairleads. The Spar and mooring are analyzed as a fully coupled system with hydrodynamic forces acting on both. Large displacement theory is used for the mooring to account for the nonlinear behavior. General considerations for the formulation and the underlying theory are outlined. Numerical examples for a Spar subjected to regular waves, wind and current in ocean depths of 3,000--5,000 feet are presented for surge and mooring forces. In addition, results are shown for the effect of mooring position.
- OSTI ID:
- 100716
- Report Number(s):
- CONF-950116--; ISBN 0-7918-1291-X
- Country of Publication:
- United States
- Language:
- English
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