Numerical simulation of ship stability for dynamic environment
TL;DR: In this article, a nonlinear approach has been tried to predict the roll response of a vessel in a beam sea and various representations of damping and restoring terms found in the literature are investigated.
About: This article is published in Ocean Engineering.The article was published on 2003-07-01. It has received 55 citations till now. The article focuses on the topics: Response amplitude operator & Ship stability.
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TL;DR: In this article, the authors present the coupled nonlinear equations of motion in heave, roll, and pitch based on physical grounds, where the ingredients of the formulation are the inertia forces and moments, restoring forces and moment, and damping forces with an emphasis on the roll damping moment.
Abstract: In order to study the dynamic behavior of ships navigating in severe environmental conditions it is imperative to develop their governing equations of motion taking into account the inherent nonlinearity of large-amplitude ship motion The purpose of this paper is to present the coupled nonlinear equations of motion in heave, roll, and pitch based on physical grounds The ingredients of the formulation are comprised of three main components These are the inertia forces and moments, restoring forces and moments, and damping forces and moments with an emphasis to the roll damping moment In the formulation of the restoring forces and moments, the influence of large-amplitude ship motions will be considered together with ocean wave loads The special cases of coupled roll-pitch and purely roll equations of motion are obtained from the general formulation The paper includes an assessment of roll stochastic stability and probabilistic approaches used to estimate the probability of capsizing and parameter identification
72 citations
TL;DR: In this article, the lift characteristics of the fins in hydrodynamic flow were studied using CFD package fluent. Good amount of reduction in roll amplitude is achieved from various simulations in random sea.
50 citations
TL;DR: In this article, the authors deal with the problem of modeling of rolling motion under a variety of excitation parameters, focusing on the analysis and prediction of the frequency of the resonant mode of rolling, since it is often an essential issue in terms of motion of a ship related to her safety against capsizing or excessive amplitudes of roll.
31 citations
TL;DR: In this article, an efficient modeling approach is presented to determine coupled roll and yaw motions of a symmetric and slender floating body when the influences of small amplitude regular waves are dominant.
30 citations
TL;DR: In this paper, the one degree-of-freedom rolling equation is applied with using the non-linear stiffness moment and linear damping moment formulas for predicting the ship rolling period.
Abstract: The paper deals with the problem of prediction of the rolling period. A special emphasis is put on the practical application of the new method for rolling period prediction with regard to non-linearity of the GZ curve. The one degree-of-freedom rolling equation is applied with using the non-linear stiffness moment and linear damping moment formulas. A number of ships are considered to research the discrepancies between the pending GM-based IMO-recommended method and the results of conducted numerical simulations performed for a wide range of operational loading conditions. Since the research shows some drawbacks of the IMO formula for the ship rolling period, a new formula is worked out and proposed instead.
25 citations
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01 Jun 1978
TL;DR: In this article, the Dynamics of Marine Vehicles (DVMV) is discussed in the context of marine vehicle dynamics, including the dynamics of marine vehicles and their dynamics of propulsion.
Abstract: Dynamics of marine vehicles , Dynamics of marine vehicles , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
413 citations
"Numerical simulation of ship stabil..." refers background or result in this paper
...Bhattacharyya (1978) discussed rolling motion of a ship and the devices for roll...
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...It is interesting to note that the present simulation agrees very well with the method suggested by Bhattacharyya (1978). The published literature gives a closed form solution to this linear dynamic problem....
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TL;DR: In this paper, a form of nonlinear equation governing the motion of a rolling ship subjected to synchronous beam waves is suggested and solved by the generalized Duffing's method in the frequency domain.
114 citations
TL;DR: In this article, the authors developed an approximation to the conventional mixed linear-plus-quadratic ship roll damping model so that analytical obstacles could be overcome in the application of the functional series expansion to non-linear ship rolling.
Abstract: : The objective of the present work was to develop an approximation to the conventional mixed linear-plus-quadratic ship roll damping model so that analytical obstacles could be overcome in the application of the functional series expansion to non-linear ship rolling. A mixed linear-plus-cubic approximation was found to be reasonable for this purpose. In the course of analyses there were indications that this model may be more generally valid than had initially been thought. (Author)
104 citations
TL;DR: In this article, the roll damping of a large floating structure in waves is computed by the linear diffraction/radiation theory and the damping is used for an accurate prediction of the rigid body motions of the structure at the wave frequencies.
104 citations