Evaluation method of passenger comfort and its application to a ship with anti-pitching fins

A new evaluation method of seakeeping performance from the point of view of passenger comfort is deduced on the basis of experimental work on the trai ning ship Kagoshima-maru. In the experiments, ship motions are measured dur ing a voyage and the feelings of trainees are surveyed by questionnaires. T he relationship between vertical acceleration and seasickness is represente d by a simple mathematical model that is expressed by the product of amplit ude of vertical acceleration, its frequency and exposure duration. It is co nfirmed that the correlation coefficient between the results of the predict ing method and the questionnaires given to the trainees shows a fairly simi lar result, In the second part of this paper, the method is applied to eval uate the effect of anti-pitching fins on ship motions from the viewpoint of passenger comfort, Model experiments were conducted to evaluate the effect s of anti-pitching fins on ship motions. A calculation method is developed to estimate the motions for a ship with anti-pitching fins. By using both t he calculation method and the evaluation method of passenger comfort, the m ost efficient area of anti-pitching fins can be designed from the viewpoint of passenger comfort.