迎浪状态下三体船垂荡和纵摇运动参数

A Parametric Study on Heave and Pitch Motion of Trimaran in Head Waves

运用基于势流理论的三维频域格林函数方法对三体船的垂荡、纵摇运动进行参数研究,讨论三体船附体位置对垂荡、纵摇运动的影响。将计算结果与实验结果进行对比,比较结果表明数值计算是可靠的。设计了十二种不同附体位置配置方案,并计算出各个方案在三个航速下的垂荡和纵摇频率响应函数曲线。计算结果表明:(1)航速对三体船的垂荡、纵摇运动影响剧烈,随着航速提高,运动幅值增加明显;(2)当三体船的航速为零时,附体位置对垂荡、纵摇的影响不明显,随着三体船航速的增加,附体位置对垂荡、纵摇影响也随之变大;(3)附体纵向位置变化对垂荡、纵摇的影响要大于其横向位置变化的影响。

In this paper, 3D frequency domain theory is utilized to carry out a parametric study on heave and pitch motion of trimaran traveling in head waves and the effect of outrigger＇s position on heave and pitch motion is discussed. First, comparison between numerical result and experimental result proves reliability of the numerical result. Subsequently, we present twelve plans of outrigger arrangement and calculate every plan＇s frequency response function at three speeds. Based on the comparison of frequency response function, three conclusions are able to be drawn： （1） sailing speed affects trimaran＇s heave and pitch motion intensely and the amplitude of heave and pitch enlarges along with the increase of sailing speed; （2） the outrigger position affects the trimaran＇s heave and pitch motion slightly as sailing speed is zero and such effects become more and more intense along with the increase of sailing speed; （3） transversal change of outrigger position affects the trimaran＇s motion more effectivelv than longitudinal change of outrigger position.