乗り心地評価の観点からのアンチピッチングフィンの性能評価

抄録

The reduction of the pitching motion of ships by mean of anti-pitching fins at the bow is analyzed both qualitatively and quantitatively through theoretical and model experimental approaches. This paper is intended to show the effect of anti-pitching fin at the stern from the viewpoint of passengers' comfort. This idea has two advantage. Firstly, the maximum force acting on the fin at the stern is smaller than that on the fin at the bow in slamming conditions. Secondly, since the fin at the stern is in wake of hull, the added resistance of fin at the stern is smaller than that of the fin at the bow. Model experiments were conducted to evaluate the effect of the anti-pitching fins on ship motions. The fin at the stern reduces vertical accelerations from 0.25G to 0.20G at the position of the bridge on the condition of a wave height of 2.0 m in head seas. Also, the authors present a new method for evaluating passenger' comfort based on questionnaires given to passenger and measured ship motions of the Kagoshima maru. The correlation coefficient between the new method and questionnaires is 0.71. We can mention that the method is reliable for estimating passengers' comfort.