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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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Real-Time Identification of Parametric Roll
Journal of Ship Research, 2022_ The International Maritime Organization (IMO) provides criteria to assess the vulnerability of ships toward the phenomenon of parametric roll. Such long-term vulnerability assessments permit to qualify statistically the ships vulnerability regarding parametric roll.
Vivien Luthy +3 more
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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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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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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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Sensitivity in numerical analysis of parametric roll
Ocean Engineering, 2013This study considers a numerical simulation of parametric roll, which causes serious safety issues for ships. The numerical simulation is carried out in regular waves and irregular waves for two container ships. In regular waves, parametric roll motion is simulated using two different time-domain methods: the impulse-response-function method and the 3D
Dong-Min Park +2 more
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Parametric Rolling of Ships – Then and Now
2011Modern research on parametric rolling of ships was first conducted in Germany in the late 1930s. This work was initiated in an effort to explain the capsizing of some small ships such as coasters and fishing vessels in severe following seas. The work included experiments with models in open water as well as numerical and theoretical computations.
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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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Evaluating Roll Damping in Parametric Rolling: Challenges and Approaches
The prediction of parametric rolling in ships remains a critical area of research due to the significant impact on maritime safety and vessel performance. Among the various parameters influencing parametric rolling, roll damping is notoriously challenging to assess due to its nonlinear nature.Turk, Anton +3 more
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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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