Tether Deformation and Tension Leg Platform Surge
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Volume 110, Issue 6
Abstract
Estimates of tension leg platform (TLP) surge presented in the literature are generally based on the assumption that the tethers are straight at all times, i.e., that transverse deformations of tethers due to hydrodynamic and inertial forces may be disregarded. The purpose of this note is to verify the validity of this assumption in the case of a deep water TLP. The equation of motion of the tethers for the platform being considered is a nonlinear partial differential wave equation. The numerical solution of that equation showed that, for an assumed harmonic motion of the platform, the hydrodynamic and inertial forces that cause the tethers to deflect will increase the amplitude of the restoring force on the platform by a factor of about three. However, the resulting platform motion does not differ significantly from that corresponding to the assumption that the tethers are straight.
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References
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Kirk, C. L., and Etok, E. V., “Dynamic Response of Tethered Production Platform in a Random Sea State,” Paper 57, Proceedings, Second International Conference on Behavior of Offshore Structures, BOSS '79, Imperial College, London, England, 28–31 Aug., 1979 (BHRA Fluid Engineering, Cranfield, Bedford, England).
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Simiu, E., and Leigh, S. D., “Turbulend Wind Effects on Tension Leg Platform Surge,” Building Science Series BSS 151, National Bureau of Standards, Washington, D.C., Mar., 1983.
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Published In
Journal of Structural Engineering
Volume 110 • Issue 6 • June 1984
Pages: 1419 - 1422
Copyright
Copyright © 1984 ASCE.
History
Published online: Jun 1, 1984
Published in print: Jun 1984
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