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SPIE Proceedings, 2016
Ships are mainly built to sail and transport cargo at sea. Environmental conditions and state of the sea are communicated to vessels through periodic weather forecasts. Despite officers being aware of the sea state, their sea time experience is a decisive factor when the vessel encounters severe environmental conditions. Another important factor is the
Nicoleta Acomi +4 more
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Ships are mainly built to sail and transport cargo at sea. Environmental conditions and state of the sea are communicated to vessels through periodic weather forecasts. Despite officers being aware of the sea state, their sea time experience is a decisive factor when the vessel encounters severe environmental conditions. Another important factor is the
Nicoleta Acomi +4 more
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Ship Stability and Parametric Rolling
Australasian Journal of Engineering Education, 20091 INTRODUCTION The stability of ships is of vital importance to the maritime world, and for a variety of reasons is likely to become even more important in the future. For example, ships in general are becoming ever larger, and a growing number of cruise ships have more decks above the waterline, potentially raising their centre of gravity and ...
Z Jovanoski, G Robinson
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Head-wave parametric rolling of a surface combatant
Ocean Engineering, 2010Complementary CFD, towing tank EFD, and nonlinear dynamics approach study of parametric roll for the ONR Tumblehome surface combatant both with and without bilge keels is presented. The investigations without bilge keels include a wide range of conditions.
Sadat Hosseini H. +7 more
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Probabilistic Properties of Parametric Roll
2011The chapter considers statistical properties of parametric roll; the source of data is numerical simulation of parametric roll of a C11 class container carrier in head seas. The characteristics considered include estimates of spectral density, autocorrelation function. Special attention is paid to uncertainty of estimates of mean value and variance.
Vadim Belenky, Kenneth Weems
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Trimaran Vessels and Parametric Roll
2011Parametric 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 ...
BULIAN, GABRIELE, FRANCESCUTTO, ALBERTO
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Parametric Roll and Ship Design
2011The variety of vessels which can suffer from parametric roll is large. It has been observed on small fishing vessels sailing in following waves but also on large cruise and container vessels in head and following waves. The occurrence of parametric roll, with high roll angles, is governed by a complex combination of main dimensions, loading condition ...
Marc Levadou, Riaan van’t Veer
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Parametric Simulation of Rolling Contact Fatigue
ASME 2008 Rail Transportation Division Fall Technical Conference, 2008Simulations of dynamic vehicle performance were used by the Wheel Defect Prevention Research Consortium (WDPRC) to explore which track and vehicle variables affect wheel fatigue life. A NUCARS® model was used to efficiently examine the effects of a multitude of parameters including wheel/rail profiles, wheel/rail lubrication, truck type, curvature ...
Scott M. Cummings +2 more
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Parametric roll mitigation using rudder control
Journal of Marine Science and Technology, 2013Severe roll angles can be developed by parametric excitation in relatively moderate weather without any apparent pre-warning for the crew onboard. In this study the prospect of using rudder control to mitigate parametric roll was investigated using multi-degree of freedom simulations.
Carl-Johan Söder +4 more
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Alternating rolls in non degenerate optical parametric oscillators
Journal of Modern Optics, 1996Pattern formation near threshold in large-aspect-ratio optical parametric oscillators with flat end reflectors and uniform pumping is investigated in the non-degenerate case. By deriving amplitude equations describing interaction of four orthogonal traveling waves, it is shown that, contrary to the degenerate case, a pure standing-wave pattern is ...
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Detection of Parametric Roll for Ships
2011Recent years have shown several incidents with dramatic damage on container vessels caused by parametric resonance. When the resonance starts, the roll oscillation at a sub-harmonic frequency of the wave excitation may be completely unexpected. Timely warning about the onset of the resonance phenomenon could make the navigator to change ship’s speed ...
Roberto Galeazzi +2 more
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