0
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

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
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

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

Grahic Jump Location
Figure 2

Truss-pontoon semisubmersible platform (TSP) in present study

Grahic Jump Location
Figure 3

Measured heave decay and linear fit of the semisubmersible model

Grahic Jump Location
Figure 4

Measured pitch decay and linear fit of the semisubmersible model

Grahic Jump Location
Figure 5

Regular wave and response time history for run No. Reg1

Grahic Jump Location
Figure 6

Wave and heave power spectra for JOSWAP random wave run RN1

Grahic Jump Location
Figure 7

Wave and heave power spectra for PM random wave run RN2

Grahic Jump Location
Figure 8

Heave RAOs of the Truss pontoon model designed for heave resonance

Grahic Jump Location
Figure 9

RAO of the conventional semisubmersible with 26s heave resonant

Grahic Jump Location
Figure 10

Regular wave time history for Reg1

Grahic Jump Location
Figure 11

Wave and pitch power spectra for JONSWAP random wave run RN1

Grahic Jump Location
Figure 12

Wave and pitch power spectra for PM random wave run RN2

Grahic Jump Location
Figure 13

Pitch RAO of TSP from regular and random wave tests

Grahic Jump Location
Figure 14

Pitch RAO of a conventional semisubmersible

Grahic Jump Location
Figure 15

Percent damping factors from tank tests

Grahic Jump Location
Figure 16

Computed heave response

Grahic Jump Location
Figure 17

Truss-pontoon semisubmersible platform for PDQ application

Grahic Jump Location
Figure 18

Truss-pontoon semisubmersible telescopic keel tank

Grahic Jump Location
Figure 19

Heave and pitch RAO for the dry tree TPS

Grahic Jump Location
Figure 20

Architect view of the extended TSP applied to an LNG terminal

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In