The University of Osaka · Engineering
Professor Atsuo Maki's research lab specializes in maritime safety and ship dynamics, with a focus on nonlinear phenomena in ship motion, particularly capsizing and parametric rolling. The lab investigates the underlying mechanisms of instability in oceangoing vessels using nonlinear dynamics and stochastic processes, aiming to improve safety standards in harsh sea conditions. Research directions include the theoretical analysis of roll motion stability, the impact of irregular wave excitation, and the application of advanced mathematical models to predict and prevent catastrophic ship behavior.
Figures are computed from collected data and may differ slightly.
Capsizing is one of the worst scenarios in oceangoing vessels. It could lead to a high number of fatalities. A considerable number of studies have been conducted until the 1980s, and one of the discoveries is the weather criterion established by the International Maritime Organization (IMO). In the past, one of the biggest difficulties in revealing the behavior of ship-roll motion was the nonlinearity of the governing equation. On the other hand, after the mid-1980s, the complexity of the capsiz
Abstract Numerous accidents caused by parametric rolling have been reported on container ships and pure car carriers (PCCs). Considering this dangerous phenomenon, the parametric rolling in irregular seas is examined in this paper based on the stability of the systems origin, which corresponds to the upright condition of the vessel. It provides a novel theoretical explanation of the instability mechanism for two cases: white-noise parametric excitation and colored-noise parametric excitation. Mo
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