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Trimaran Vessels and Parametric Roll

  • Gabriele BulianEmail author
  • Alberto Francescutto
Chapter
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Abstract

Parametric roll can occur in case of trimaran vessels, in particular when the outriggers have limited draught and/or limited transversal separation. Due to the significant nonlinearities of the restoring moment and due to the often complex shape of the metacentric height in waves for this type of ships, parametric roll clearly shows quite peculiar characteristics. Starting by the description of a simplified 1-DOF nonlinear mathematical model for parametric roll in longitudinal regular waves the paper then describes how the Floquet theory can be directly applied to the linearized model in order to determine the instability regions for the upright position. An example of calculation of stability map for the upright position is provided. Also another example for prediction of rolling amplitude in the nonlinear range to highlight the peculiar aspects relevant to the considered trimaran configuration is discussed. In both cases experimental data are also reported for comparison. Finally the paper describes how the position of the outriggers can be optimally chosen in order to minimize the variations of metacentric height in waves.

Keywords

Wave Crest Monodromy Matrix Forward Speed Floquet Theory Parametric Roll 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors wish to express their appreciation to those students which provided contributions for the present paper during their thesis works: Mr. Luca Boaro, Mr. Giovanni Dall’Aglio, Mr. Fabio Fucile, and Mr. Marco Sinibaldi.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Department of Mechanical Engineering and Naval ArchitectureUniversity of TriesteTriesteItaly

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