三体船横摇运动

Investigation of Trimaran Roll Motion Characteristics

介绍了关于三体船横摇运动的研究工作。采用能量法 ,由自由横摇衰减试验测量数据计算了三体船横摇阻尼系数 ,分析横摇过程中阻尼非线性作用的特点 ,讨论侧体横向布置位置、舭龙骨和航速对三体船横摇运动的影响 ,对线性、非线性方法用于预报三体船横摇运动进行比较分析。三体船模型横摇试验包括静水中的自由横摇衰减试验、规则波中的零速横摇试验。试验中通过系列变化侧体横向布置位置 ,并对侧体安装舭龙骨进行对比试验 ,研究侧体布置和舭龙骨对三体船横摇运动的影响。经与试验结果对比 。

This paper presents the investigation on the roll motion characteristics of a rtimaran. An energy method was used for estimation of the damping coefficient from the free roll decay experiment data. Effects of nonlinear roll damping on the roll motion, roll damping components and trimaran roll motion were analysed and discussed. The results of the invesigation provide a better understanding to the effect on trimaran roll motion of side hull transverse position, bilge keel and forward speed. Comparison was made for the estimation with the linear and linear plus quadratic method. Free decay experiments were conducted in calm water at various model speeds and roll experiments in transverse regular waves at zero speed. In the test the side hull transverse position was systematically varied and bilge keels were fitted on each side hull, in order to investigate the effect on the trimaran roll motion of side hull transverse position and bilge keels. The prediction for roll motion with estimated roll damping coefficient was verified by model experiments and good agreement was achieved.