衝突時の油流出防止のための緩衝型船首構造に関する研究

概要

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We still have experienced cargo oil spill from a struck D/H(double hull) tanker like the accident case of "Baltic Carrier", see Photo-1. "Buffer Bow" has come to be considered as an innovative strategy following after D/H system to prevent marine environmental pollution. The mission expected to buffer bow is "minimizing the damage on the struck ship" and thus "decreasing the risk of oil outflow from struck D/H tankers" when it encounters collision accidents. As the measures to represent the performance level of buffer bow the critical striking velocity (V_<b,cr>) and the critical collision angle (θ_<cr>) are proposed. Those critical events are defined as the threshold where the inner hull of struck tanker is ruptured or not. The contribution of buffer bow has been evaluated through a series of FEM simulation analyses by adopting a typical D/H VLCC as the model struck ship, and VLCC's, Aframax. class tankers and container ships as the candidate striking ships. At the final stage the effect of buffer bow is evaluated by focusing on the performance that how much the risk of oil outflow is decreased. "The mean oil outflow" is derived based on probabilistic procedure. The case study has shown that the probabilistic oil outflow is decreased by about 80% if buffer bow design is adopted to VLCC.
独立行政法人海上技術安全研究所の論文
2007-06-29