ABSTRACT

This paper presents the impact of different geometrical parameters on the seakeeping of a trimaran in regular oblique waves. Experimental tests for eight different arrangements of outriggers were conducted for a range of wave frequencies where a constant wave heading, and wave height was maintained. It was found that the position of outriggers and the hull shape have significant impacts on dynamic performance of the model. Roll motions reduce with an increase in longitudinal spacing of main and demi hulls transoms, separation of outrigger centre lines and buoyancy fraction of outriggers, while heave motion and resistance are increased, and pitch motions are slightly influenced. It was concluded that positioning of outriggers can reduce the roll motions peak amplitude by 80%. This is due to the trimaran geometry and the effect of reflected waves between the hulls. In configurations with minimum roll motion, the added resistance peak is maximised when compared with other configurations.

摘要

本文介绍了规则斜波中不同几何参数对三体船航海的影响。在一定范围内的波速和波高保持不变的情况下，对八个支腿的布置进行了实验测试。发现支腿的位置和船体形状对模型的动态性能有重大影响。横摇运动随着主船体和半船体船尾板的纵向间距的增加，悬臂支架中心线的分离以及悬臂支架的浮力分数的增加而减小，而升沉运动和阻力增大，而俯仰运动则受到轻微影响。结论是，支腿的定位可以将侧倾运动的峰值幅度降低80％。这是由于三体船的几何形状和船体之间反射波的影响。在具有最小侧倾运动的配置中，与其他配置相比，添加的电阻峰值最大。