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An Alternative to Model the Non-Linear Roll Damping of a FPSO Hull

[+] Author Affiliations
Allan C. de Oliveira

Petrobras R&D Center, Rio de Janeiro, Brazil

Antonio Carlos Fernandes

LOC/COPPE - UFRJ, Rio de Janeiro, Brazil

Paper No. OMAE2010-20949, pp. 805-818; 14 pages
doi:10.1115/OMAE2010-20949
From:
  • ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
  • 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 3
  • Shanghai, China, June 6–11, 2010
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4911-8 | eISBN: 978-0-7918-3873-0
  • Copyright © 2010 by ASME

abstract

The ship rolling problem is a subject that has been studied from a long time. From Froude (in the XIX century) to nowadays, this problem was revisited several times in order to adjust the theory to the changes in ship hulls, dimensions, materials, appendages and others. On the other hand, the ship analysis resources technologies including both the experimental techniques and the computational capacity (that not exist in Froude’s time) also have amazingly increased. Although all this technological apparatus, that allows testing a model for several conditions a large number of times, the standard way to estimate the non linear roll damping have not been significantly modified (since Froude’s time!). As a result, some ship applications (as a FPSO, for instance) that require more effective roll suppressor appendages have evidenced behaviors that are not in accordance with the ship industry methodology to predict them. The roll standard theory for ship rolling is, however, a well established theory, based on a solid knowledge about viscous effects in fluids. Hence the question is would it be possible to use all the technological development to get a better approach and estimative of roll damping? This paper will discuss how this may be possible, showing an alternative method to estimate the roll damping and testing for a FPSO with strong non-linear behavior observed in model tests suggesting among other thing alternative ways to perform model testing.

Copyright © 2010 by ASME
Topics: Damping , FPSO , Hull

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