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Journal of Offshore Mechanics and Arctic Engineering | Volume 128 | Issue 2 | TECHNICAL PAPERS
TECHNICAL PAPERS

Response Analysis of a Truss-Pontoon Semisubmersible With Heave-Plates

[+] Author and Article Information
Nagan Srinivasan

 Deepwater Structures, Inc., Houston, TX 77459-3983

Subrata Chakrabarti

 Offshore Structure Analysis, Inc., Plainfield, IL 60544-7096

R. Radha

 Prairie View A&M University, Prairie View, TX 77446

J. Offshore Mech. Arct. Eng 128(2), 100-107 (Dec 27, 2005) (8 pages) doi:10.1115/1.2185679 History: Received June 30, 2005; Revised December 27, 2005
Article
References
Figures
Tables
Citing Articles

An offshore platform that is efficiently designed to reduce the wave excitation forces and increase the separated-flow damping could qualify as a platform operating even near its resonance. Such design could make this concept cost-effective, as well as operationally more productive with minimum downtime. The principal purpose of this paper is to describe an offshore platform design that could face the resonance efficiently. The paper applies the concept of both hydrodynamic added mass and separated-flow damping intelligently in the design of a large deepwater floating vessel on column-stabilized principle. The platform is designed to face resonance due to extreme waves and utilizes the damping to control its motion, thereby qualifying its field application. The design is justified and verified with the results of a scaled-model study in a large wave tank. The results of the correlation of theoretical study with the model test results are presented herein. A few variations of the deepwater platform concept are discussed.
Copyright © 2006 by American Society of Mechanical Engineers
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References

1
Chakrabarti, S. K. Technical Editor, 2005, "Handbook of Offshore Engineering", Elsevier Publications, Oxford, UK, Chap. 7.
2
Tao, L., and Thiagarajan, K., 2003, "Low KC Regimes of Oscillating Sharp Edges, Part I: Vortex Shedding Observation", Applied Ocean Research, Elsevier.
3
Tao, L., and Thiagarajan, K., 2003, "Low KC Regimes of Oscillating Sharp Edges, Part II: Hydrodynamic Forces", Applied Ocean Research, Elsevier.
4
Srinivasan, N., and Swamidas, A. S. J., 1988, “Damping-Controlled Response of a Deepwater Tripod Tower Platform to Moderate Waves,” CADMO-88-Southampton, U.K.
5
Srinivasan, N., Swamidas, A. S. J., and Pawloski, J. S., 1991, “Effect of Induced Drag Damping on the Near Resonant Response of a Deep Water Platform,” 23rd Annual Offshore Technology Conference, Houston, Texas.
6
Srinivasan, N., 2004, United States Patent, Patent No. US 6 761 124 B1, Column-Stabilized Floating Structures with Truss-Pontoons, July 13th.
7
Chakrabarti, S. K., 2002, "The Theory and Practice of Hydrodynamics and Vibration", World Scientific, Singapore, Chap. 6.
8
Chakrabarti, S. K., 1990, "Hydrodynamics of Offshore Structures", WIT, Ashurst, Southampton, UK.
9
Bindingsbø, A. U., and Bjørset, A., 2002, “Deep Draft Semisubmersible,” "Proceedings of OMAE ’02", Oslo, Norway, OMAE2002-28369.
10
Moyer, M. C., Barry, M. D., and Tears, N. C., 2001, “Hoover-Diana Deepwater Drilling and Completions,” "Proceedings, Offshore Technology Conference", OTC 13081.

Figures

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+Conventional semisubmersible platform (GVA 27000-Atlantis) (PQ)
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Conventional semisubmersible platform (GVA 27000-Atlantis) (PQ)
Figure 1

Conventional semisubmersible platform (GVA 27000-Atlantis) (PQ)

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+Truss-pontoon semisubmersible platform (TSP) in present study
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Truss-pontoon semisubmersible platform (TSP) in present study
Figure 2

Truss-pontoon semisubmersible platform (TSP) in present study

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+Measured heave decay and linear fit of the semisubmersible model
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Measured heave decay and linear fit of the semisubmersible model
Figure 3

Measured heave decay and linear fit of the semisubmersible model

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+Measured pitch decay and linear fit of the semisubmersible model
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Measured pitch decay and linear fit of the semisubmersible model
Figure 4

Measured pitch decay and linear fit of the semisubmersible model

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+Regular wave and response time history for run No. Reg1
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Regular wave and response time history for run No. Reg1
Figure 5

Regular wave and response time history for run No. Reg1

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+Wave and heave power spectra for JOSWAP random wave run RN1
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Wave and heave power spectra for JOSWAP random wave run RN1
Figure 6

Wave and heave power spectra for JOSWAP random wave run RN1

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+Wave and heave power spectra for PM random wave run RN2
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Wave and heave power spectra for PM random wave run RN2
Figure 7

Wave and heave power spectra for PM random wave run RN2

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+Heave RAOs of the Truss pontoon model designed for heave resonance
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Heave RAOs of the Truss pontoon model designed for heave resonance
Figure 8

Heave RAOs of the Truss pontoon model designed for heave resonance

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+RAO of the conventional semisubmersible with 26s heave resonant
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RAO of the conventional semisubmersible with 26s heave resonant
Figure 9

RAO of the conventional semisubmersible with 26s heave resonant

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+Regular wave time history for Reg1
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Regular wave time history for Reg1
Figure 10

Regular wave time history for Reg1

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+Wave and pitch power spectra for JONSWAP random wave run RN1
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Wave and pitch power spectra for JONSWAP random wave run RN1
Figure 11

Wave and pitch power spectra for JONSWAP random wave run RN1

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+Wave and pitch power spectra for PM random wave run RN2
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Wave and pitch power spectra for PM random wave run RN2
Figure 12

Wave and pitch power spectra for PM random wave run RN2

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+Pitch RAO of TSP from regular and random wave tests
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Pitch RAO of TSP from regular and random wave tests
Figure 13

Pitch RAO of TSP from regular and random wave tests

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+Pitch RAO of a conventional semisubmersible
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Pitch RAO of a conventional semisubmersible
Figure 14

Pitch RAO of a conventional semisubmersible

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+Percent damping factors from tank tests
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Percent damping factors from tank tests
Figure 15

Percent damping factors from tank tests

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+Computed heave response
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Computed heave response
Figure 16

Computed heave response

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+Truss-pontoon semisubmersible platform for PDQ application
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Truss-pontoon semisubmersible platform for PDQ application
Figure 17

Truss-pontoon semisubmersible platform for PDQ application

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+Truss-pontoon semisubmersible telescopic keel tank
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Truss-pontoon semisubmersible telescopic keel tank
Figure 18

Truss-pontoon semisubmersible telescopic keel tank

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+Heave and pitch RAO for the dry tree TPS
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Heave and pitch RAO for the dry tree TPS
Figure 19

Heave and pitch RAO for the dry tree TPS

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+Architect view of the extended TSP applied to an LNG terminal
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Architect view of the extended TSP applied to an LNG terminal
Figure 20

Architect view of the extended TSP applied to an LNG terminal

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