This opening article of the issue is intended to provide a review of the eld of nonlinear ship dynamics and to demonstrate the importance of the subject in the context of naval architecture. A list of relevant research topics that have received attention in recent years is included in the rst section of the paper. This sets the scene for a brief discussion about the content and contribution of the articles that make up the Theme Issue. In order to facilitate understanding by non-specialists, we include an outline of the general concepts of nonlinear dynamics. Furthermore, we provide a detailed review of the evolution of ship research of the considered type since the 1970s, including a rather lengthy bibliography. We discuss the latest ideas about ship capsize and we include a special section summarizing the recent advances with regard to the mechanisms of ship capsize in astern seas. We close the article by o¬ering some ideas about future directions for research.
Capsizing experiments were carried out in both long-crested irregular and short-crested irregular waves. Here a self-propelled model of purse seiner and one of container ship ran with auto pilots in following and quartering waves. To examine drafts of operational guidance that were recently proposed to the IMO, dangerous conditions in ship speed and heading angle were identified. The experimental results demonstrate effects of short-crested wave nature on capsize in following and quartering waves. In addition, effects of group wave were also discussed. Long-crested irregular waves, which were used in the
The dynamic stability of ships encountering large regular waves from astern is analyzed, with focus on delineating the specific conditions leading to the uncontrolled turn identified as broaching. The problem's formulation takes into account motions of the actively steered or controls-fixed vessel in surge-sway-yaw-roll with consideration of Froude-Krylov and diffraction wave excitation. Dynamical analysis of surf-riding is carried out for the general case of quartering waves, exploring the route periodic motions—surf riding, loss of stationary stability, turn, capsize. Steady-state and transient analysis is carried out in the system's multidimensional state-space in order to identify all existing limit sets and locate attracting domains. Broaching from periodic motions is also a part of the investigation.
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