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A Comparison Among Alternatives to Assess FPSO Roll Damping via Model Testing

[+] Author Affiliations
Allan C. de Oliveira

PETROBRAS R&D Center, Rio de Janeiro, Brazil

Antonio Carlos Fernandes, Anderson R. W. Soares

LOC / COPPE - UFRJ, Rio de Janeiro, Brazil

Paper No. OMAE2014-23277, pp. V01AT01A016; 13 pages
doi:10.1115/OMAE2014-23277
From:
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1A: Offshore Technology
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4537-0
  • Copyright © 2014 by ASME

abstract

The prediction of the nonlinear rolling motions of a FPSO with extended bilge keels stills a challenging problem. Despite recent advantages in CFD computations, the use of model testing is considered the standard strategy for roll damping assessments. There are different ways to assess the roll damping via model testing and the three most common are the use of decay tests, tests in regular and irregular waves. The comparison among those different kinds of tests may present incoherent results, sometimes, introducing the question of which methodology is the most appropriated in those scenarios, with impact in model test specifications.

Decay tests are the easiest and the most economical way for roll assessments, but they are usually considered inaccurate compared to the other test types. Recent researches, however, have shown that a statistic approach which utilizes several decay data from the same model and loading condition improves the damping predictions. This paper provides comparisons of damping predictions from different test types based in extensive model test campaigns. It also addresses the issues and the lessons learned during the campaigns to obtain the FPSO damping database.

Copyright © 2014 by ASME
Topics: Damping , Testing , FPSO

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