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Author: Nien-Tsu Shu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Nien-Tsu Shu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jixiu Xu
Publisher:
ISBN:
Category : Couplings
Languages : en
Pages : 52
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Author: C. S. HSU
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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An investigation was made of the effect of certain nonlinear coupling terms on the heave-pitchroll motions of a ship moving in longitudinal waves (either head or following waves). Linear damping terms were retained in the analysis because when forced ship motions under wave excitation are studied, the damping terms are essential elements of the problem. The analysis for the heave-pitch-roll system showed the existence of a type of instability such that the responses in pitch or roll may grow without bound even when the effect of damping was taken into account because of nonlinear coupling between heave and pitch and between heave and roll. This is in contrast to the results obtained from the linear theory in which, because of the presence of damping, all the responses are finite. (Author).
Author: W. D. Kinney
Publisher:
ISBN:
Category : Ships
Languages : en
Pages : 66
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The equations of motion for a ship pitching and rolling in a calm sea were found to be coupled by means of a second order term in the rolling equation of motion. When the pitching motion is simple harmonic the equation of motion in roll is of the Mathieu type, the two independent parameters being pitching amplitude and frequency. The stability diagram of the Mathieu equation including the effect of linear damping is determined theoretically and verified by solving the Mathieu equation on an analogue computer. In experiments with one ship model form, it was found that the transition from stable to unstable motion occurred for the value of the parameters predicted by the theory, and that the rolling motions obtained experimentally closely resembled the computer solutions. It was concluded that (1) unstable rolling motions are possible for very small pitching amplitudes, (2) when the natural frequency of pitch is twice that of roll the amplitude required to produce unstable motion is a minimum, and (3) for any pitching frequency, the greater the amount of damping, the greater the amplitude of pitching must become to produce unstable rolling motions. (Author).
Author: W. D. Kinney
Publisher:
ISBN:
Category : Ships
Languages : en
Pages : 68
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The concept of normal oscillations of a nonlinear conservative system is introduced and applied to the ship motion problem. In addition the stability of these normal modes is investigated and found to depend in general on the same parameters given in previous investigations. Since the normal oscillations represent a combined motion in the degrees of freedom concerned, an unstable mode does not necessarily imply unbounded motion in any one of the degrees of freedom. Since the system is assumed to be conservative, all displacements are necessarily finite. A knowledge of those straight normal modes which are stable is important since it is reasonable to conclude that the motion of ships in calm water will take place near those normal modes. In the absence of damping, the system is conservative, and hence the total energy of the system is a constant. This implies that all displacements and velocities must be finite. Because damping is always present, the system must ultimately reach a stable equilibrium position since energy is constantly dissipated from the system. (Author).
Author: Marcelo Almeida Santos Neves
Publisher: Springer Science & Business Media
ISBN: 9400714823
Category : Technology & Engineering
Languages : en
Pages : 840
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During the last decade significant progress has been made in the field of ship stability. Yet in spite of the progress made, numerous scientific and practical challenges still exist with regard to the accurate prediction of extreme motion and capsize dynamics for intact and damaged vessels, the probabilistic nature of extreme events, criteria that properly reflect the physics and operational safety of an intact or damaged vessel, and ways to provide relevant information on safe ship handling to ship operators. This book provides a comprehensive review of the above issues through the selection of representative papers presented at the unique series of international workshops and conferences on ship stability held between 2000 and 2009. The editorial committee has selected papers for this book from the following events: STAB 2000 Conference (Launceston, Tasmania), 5th Stability Workshop (Trieste, 2001), 6th Stability Workshop (Long Island, 2002), STAB 2003 Conference (Madrid), 7th Stability Workshop (Shanghai, 2004), 8th Stability Workshop (Istanbul, 2005), STAB 2006 Conference (Rio de Janeiro), 9th Stability Workshop (Hamburg, 2007), 10th Stability Workshop (Daejeon, 2008), and STAB 2009 Conference (St. Petersburg). The papers have been clustered around the following themes: Stability Criteria, Stability of the Intact Ship, Parametric Rolling, Broaching, Nonlinear Dynamics, Roll Damping, Probabilistic Assessment of Ship Capsize, Environmental Modelling, Damaged Ship Stability, CFD Applications, Design for Safety, Naval Vessels, and Accident Investigations.
Author: Wendell L. Hercules
Publisher:
ISBN:
Category : Environmental engineering
Languages : en
Pages : 162
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Author: United States Naval Research Office
Publisher:
ISBN:
Category :
Languages : en
Pages : 1140
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Author:
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 1140
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![Nonlinear Coupling of Pitch and Roll Modes in Ship Motions [by] Ali Hasan Nayfeh, Dean T. Mook and Larry R. Marshall PDF](https://books.google.com/books/content/images/frontcover/YNEGcgAACAAJ?fife=w80-h100)
Author: Ali Hasan Nayfeh
Publisher:
ISBN:
Category : Ships
Languages : en
Pages : 46
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