16 パラメトリック横揺れ防止装置としてのアンチローリングタンクの性能推定(第2報)

概要

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Recently, serious accidents due to parametric rolling of container carriers and pure car carriers have been reported. For the prevention of parametric rolling, an Anti-Rolling Tank (ART) is regarded as one of the most effective devices. To estimate the performance of ART, however, an estimation of damping coefficient of ART is required for numerical simulation of parametric rolling. In the previous report, the MPS method (Moving-Particle-Semi-implicit method) were applied to the estimation of damping coefficient of ART, and it was confirmed that the MPS method can estimate not only damping coefficient but also natural period of ART in reasonable computation time. Furthermore, numerical simulation method with damping coefficient of ART obtained by the MPS method can well reproduce experimentally observed parametric rolling of a post-Panamax containership. In this report, the developed estimation method of ART performance is applied to a more practical and complicated ART having an appendage aimed for increasing eddy-making component of damping of ART. Free decay tests and free running model experiments are conducted for several sets of the height and position of the appendage to confirm its effect on parametric rolling prevention. Finally, the improvement of ART form is proposed to enhance the ART performance as a parametric rolling prevention device without increasing of tank water volume.