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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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Nonlinear and stochastic aspects of parametric rolling modeling
2004This paper addresses, starting from an extensive series of tests in longitudinal regular waves (already done) and irregular waves (in progress), the problems connected with the threshold formulation for parametric rolling and its amplitude modeling above threshold.
FRANCESCUTTO, ALBERTO +2 more
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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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Probability of Parametric Roll in Random Seaways
2011The aim of the present chapter is to advocate for a very effective stochastic procedure based on the First-Order Reliability method (FORM) and Monte Carlo simulations (MCS), for prediction of parametric rolling in stationary stochastic seaways. Due to efficient optimization procedures implemented in standard FORM codes and the short duration of the ...
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, 2009 Estimation of Parametric Roll in Random Seaways
2011This chapter attempts to provide a guideline for quantifying the magnitude of parametric roll of a ship in irregular seaways. First, in the light of physical model experiments with a scaled ship model in irregular water waves, it is shown that parametric roll of this ship model is a practically nonergodic process.
Naoya Umeda +3 more
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Synchronous Rolling and Parametric Rolling of Ships
2006C.B. Barrass, Captain D.R. Derrett
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On the Nonlinear Modelling of Parametric Rolling in Regular and Irregular Waves
2003This paper summarizes the results and the problems still open regarding the development of a 1.5DOF nonlinear mathematical model of the parametric rolling in longitudinal waves with particular regard to the head sea condition. A first part is devoted to the case of regular waves, while the second concerns parametric rolling generated by irregular waves
BULIAN, GABRIELE +2 more
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