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Strutures, Safety and Reliability

Dynamic Analysis of Deep Water Tension Leg Platforms Under Random Waves

[+] Author and Article Information
R. Jayalekshmi

Department of Civil Engineering, NSS College of Engineering, Palakkad, Kerala 678008, Indiajayalsankar@yahoo.co.in

R. Sundaravadivelu

Department of Ocean Engineering, Indian Institute of Technology, Madras, Chennai 600036, Indiarsun@iitm.ac.in

V. G. Idichandy

Department of Ocean Engineering, Indian Institute of Technology, Madras, Chennai 600036, Indiachandy@iitm.ac.in

J. Offshore Mech. Arct. Eng 132(4), 041605 (Oct 20, 2010) (4 pages) doi:10.1115/1.4001432 History: Received April 29, 2009; Revised January 18, 2010; Published October 20, 2010; Online October 20, 2010

The effect of tether-riser dynamics on the response characteristics of deep water tension leg platforms in water depths 900 m and 1800 m under random waves is investigated using a developed nonlinear finite element analysis program in the time-domain. Updated Lagrangian coordinates and incremental iterative solution based on Newmark’s integration scheme are adopted. Linear wave theory is used. Relative velocity form of Morison’s equation is used for estimating the wave forces. Current forces are also included in the analysis. Results are reported in the form of statistical values of responses. The statistical values of responses are found to increase with water depth and significant increase is observed when risers are included.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

Grahic Jump Location
Figure 2

Heave response in water depths 900 m and 1800 m

Grahic Jump Location
Figure 3

Spectral distribution of surge and heave for a 900 m deep TLP

Grahic Jump Location
Figure 1

Geometrical configuration of the TLPs in water depths 900 m and 1800 m

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