Parametric roll due to hull instantaneous volumetric changes and speed variations |
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| Authors: | Jelena Vidic-Perunovic Jørgen Juncher Jensen |
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| Institution: | Technical University of Denmark, Department of Mechanical Engineering, Coastal, Maritime and Structural Engineering, Nils Koppels Alle, Building 403, DK-2800-Kgs. Lyngby, Denmark |
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| Abstract: | Parametric roll of a containership in head sea condition has been studied in the paper. A time domain routine for GZ righting arm calculation based on exact underwater hull geometry has been implemented into a two-degree-of-freedom procedure for roll response calculation. The speed variation due to e.g. added resistance has been accounted for in the model by the surge velocity. The ship roll motion due to a regular wave critical for parametric roll occurrence has been simulated, as well as the ship roll response in a severe stochastic sea. The present method has been compared with other existing methods for parametric roll prediction. |
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