Stability of small fishing vessels in longitudinal waves |
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| Authors: | M A S Neves N A Prez L Valerio |
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| Institution: | a Department of Ocean Engineering, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;b Institute of Naval and Maritime Sciences, Austral University of Chile, Valdivia, Chile |
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| Abstract: | The dynamic stability of fishing vessels in longitudinal regular waves is investigated, both analytically and experimentally. In particular, the influence of stern shape on the parametric stability of fishing vessels is studied. Vessels TS and RS have very similar main characteristics, but their sterns are different. Although their linear responses are comparable, both analytical and experimental investigations indicate substantial differences in their dynamic stability in longitudinal regular waves. Strong resonances are found for the vessel with the deep transom. The analytical method takes into consideration the effects of the heave and pitch motions and wave passage and shows good agreement with experimental results. Stability limits are obtained for different conditions and are used as an aid in the discussion of the results obtained in the tests when relevant parameters are changed, such as wave amplitude and frequency, metacentric height and roll damping moment. |
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| Keywords: | Ship stability Roll motion Parametric resonance |
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