Influence of Surge on Extreme Roll Amplitudes

Jelena Vidic-Perunovic, Olav Rognebakke, Preben Terndrup Pedersen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Interference of the wave-induced ship surge motion with roll dynamics has been studied. The surge motion has been included in a previously derived hydrodynamic roll prediction model in order to account for the ship speed variation due to the longitudinal incident wave pressure force. Depending on the position of the wave crest relatively to the ship, the ship will be slowed down when she meets the wave. In this paper attempts are made to accurately account for added resistance and additional thrust, applied in order to maintain the ship speed. The surge equilibrium equation has been longitudinally balanced in order to determine the added thrust term that would represent actions to maintain speed The resulting forward speed variation affects the frequency of encounter and the parametric roll resonant condition is directly influenced by this speed variation. The analysis procedure is demonstrated for an example containership sailing mainly in head sea condition and higher sea states. Sensitivity of the results to the added thrust model and vertical motion calculation is discussed.
Original languageEnglish
Title of host publicationProceedings of the ASME 27th International Conference on Offshore Mechanics and Artic Engineering : Proceedings of OMAE2008, CD © 2008 by ASME. All rights reserved
VolumeOMAE2008- 57329
PublisherAmerican Society of Mechanical Engineers
Publication date2008
ISBN (Print)0-7918-3821-8
Publication statusPublished - 2008
Event27th International Conference on Offshore Mechanics and Arctic Engineering - Estoril, Portugal
Duration: 15 Jun 200820 Jun 2008
Conference number: 27

Conference

Conference27th International Conference on Offshore Mechanics and Arctic Engineering
Number27
CountryPortugal
CityEstoril
Period15/06/200820/06/2008

Keywords

  • Parametric roll
  • added resistance
  • reliability method
  • additional propeller thrust
  • stochastic wave loads

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