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TECHNICAL PAPERS

An Experimental Investigation of Parametric Rolling in Head Waves

[+] Author and Article Information
Alberto Francescutto

DINMA, University of Trieste, 34127 Trieste, Italye-mail: francesc@univ.trieste.it

J. Offshore Mech. Arct. Eng 123(2), 65-69 (Jan 01, 2001) (5 pages) doi:10.1115/1.1355247 History: Received December 04, 2000; Revised January 01, 2001
Copyright © 2001 by ASME
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References

Figures

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Full-scale ship restoring arm in calm water
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Equivalent linear damping for the scale model from the decay tests as a function of velocity in calm water
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Natural frequency of roll motion for the scale model from the decay tests as a function of forward speed
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Experimental parametric roll amplitude as a function of ship speed for the case of wave steepness 1/50
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Variation of initial metacentric height in longitudinal waves
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Instability zone of the Mathieu equation for the investigated ship model. Solid line indicates the boundary of stability for the undamped case; dashed line indicates the boundary of stability for the damped case. Solid points correspond to experiments where parametric rolling was observed.
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Ship righting arm variation with wave position along the ship. For comparison, the righting arm in calm water is reported. The figure refers to the case Sw=1/50.
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Simulation of roll amplitude above threshold (solid curve) obtained by means of the nonlinear analytical approach based on Eq. (11)

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