A Study on the uncertainty and sensitivity in numerical simulation of parametric roll

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Abstract

Uncertainties related to numerical modelling of parametric roll have been investigated by using a 6-DOFs model with nonlinear damping and roll restoring forces. At first, uncertainty on damping coefficients and its effect on the roll response is evaluated. Secondly, uncertainty due to the “effective (equivalent) wave” concept in calculation of restoring moment is studied. Finally, uncertainty to roll response from different methods of GZ calculation has been checked. It is found that the equivalent wave concept is sufficiently accurate for the purpose of GZ calculation. Two different GZ approximations give a good agreement with direct calculation method if relevant coefficients have been properly found in the fitting.
Original languageEnglish
Title of host publicationProceedings of the 13th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS’2016)
EditorsUlrik Dam Nielsen, Jørgen Juncher Jensen
Number of pages8
PublisherTechnical University of Denmark
Publication date2016
ISBN (Electronic)978-87-7475-473-2
Publication statusPublished - 2016
Event13th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS'2016) - Hotel Crowne Plaza, Copenhagen, Denmark
Duration: 4 Sep 20168 Sep 2016
Conference number: 13

Conference

Conference13th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS'2016)
Number13
LocationHotel Crowne Plaza
Country/TerritoryDenmark
CityCopenhagen
Period04/09/201608/09/2016

Keywords

  • Uncertainty
  • Sensitivity
  • Nonlinear damping
  • Nonlinear restoring
  • GZ approximation
  • 6-DOFs model
  • Effective (Equivalent) wave

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