Conventional analysis of tension leg platform structures yields natural frequencies which are well separated from wave excitation frequencies. However, the results presented here show that the tethers can have lateral resonant frequencies in the wave frequency range if the platform is deployed in deep water. Analysis which ignores the lateral tether dynamics gives reasonable estimates of platform motions but can seriously underestimate tether displacements. It is usually assumed that tether tension does not vary with time. However, the vertical waves forces, reacted by the tethers, cause the tension to change with time and this can cause a Mathieu type of instability in the platform sway motion. This phenomenon is investigated using a simple energy balance technique and it is shown that square law fluid damping places an upper bound on oscillation amplitude; it is found that platform sway motions due to Mathieu excitation remain acceptable even in large waves.
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September 1982
Research Papers
Dynamic Analysis Models of Tension Leg Platforms
E. R. Jefferys,
E. R. Jefferys
Department of Mechanical Engineering, University College London, London, England
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M. H. Patel
M. H. Patel
Department of Mechanical Engineering, University College London, London, England
Search for other works by this author on:
E. R. Jefferys
Department of Mechanical Engineering, University College London, London, England
M. H. Patel
Department of Mechanical Engineering, University College London, London, England
J. Energy Resour. Technol. Sep 1982, 104(3): 217-223 (7 pages)
Published Online: September 1, 1982
Article history
Received:
July 6, 1981
Revised:
January 25, 1982
Online:
October 22, 2009
Citation
Jefferys, E. R., and Patel, M. H. (September 1, 1982). "Dynamic Analysis Models of Tension Leg Platforms." ASME. J. Energy Resour. Technol. September 1982; 104(3): 217–223. https://doi.org/10.1115/1.3230406
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