规则波浪中舰船摇荡耦合切片计算方法  

Strip calculations for ship oscillation coupled response in regular waves

作　　者：朱军[1] 夏齐强 王智宇[1] 朱韬 黄昆仑[1] 葛义军[1] ZHU Jun;XIA Qiqiang;WANG Zhiyu;ZHU Tao;HUANG Kunlun;GE Yijun(College of Naval Architecture and Ocean Engineering,Naval University of Engineering,Wuhan 430033,China;Naval Research Academy,Shanghai 200235,China)

机构地区：[1]海军工程大学舰船与海洋学院,湖北武汉430033 [2]海军研究院,上海200235

出　　处：《中国舰船研究》2018年第4期49-56,共8页Chinese Journal of Ship Research

摘　　要：[目的]切片理论方法在舰船耐波性设计中有着广泛的工程应用,该方法是针对切片平均位置来计算水动力,本质上缺少船体垂荡、纵摇与横摇的运动耦合性。为有效耦合船体垂荡、纵摇与横摇的运动,[方法]基于广义纵倾角和广义吃水增量的参数,以及船体坐标系下瞬时波面方程的解析表达式,以满足波面处压力为零的条件修正波面下压力分布的计算公式(史密斯效应);基于波面方程和压力分布修正公式,给出瞬时波面下船体切片的静水力与傅汝德—克雷洛夫波浪扰动力之和的计算方法,惯性水动力和阻尼力则采用经验公式估算。建立船体垂荡、纵摇与横摇耦合的时变系数动力学方程,采用AutoCAD图形面域技术开发计算软件,数值计算规则波浪中舰船的耦合摇荡运动。[结果]数值计算结果表明,大波高时横摇幅频曲线呈现出较为显著的因摇荡耦合导致的非线性效应,同时在横摇共振区内有明显的波浪传播方向的横摇偏摇现象。[结论]所得计算方法对于舰船高海况下的耐波性预报将产生积极的作用,计算软件可以作为耐波性设计选型的评估手段。[Objectives]The strip method is widely used in the sea-keeping design of ships,but the hydrodynamics are only evaluated for the mean-hull position,so heaving,pitching and rolling motions are not essentially coupled.[Methods]For the effective coupling of hull heaving,pitching and rolling motions,based on the extensive pitch angle and increased draught,and the analytical expression of the instantaneous wave surface equation under the hull coordinate system,the calculation formula of pressure distribution under the wave surface is amended under the condition that the pressure at the wave surface is zero(Smith effect).Based on the wave surface equation and pressure distribution correction formula,the calculation method for obtaining the hydrostatic force on hull sections under an instantaneous wave surface and Froude-Krylov wave excitation force is given.Inertial hydrodynamic force and damping force are calculated by empirical formulations.As such,the heaving,pitching and rolling coupling dynamic equations are derived via the time variants of the coefficients,and calculation software is developed on the basis of surface area computing technology of AutoCAD.[Results]The simulation results show very clear characters with the linear method on small wave height,the rolling amplitude frequency response very evidently shows non-linear effects for heavy seas,and the rolling-yawing can also be seen in the wave direction in the resonance region.[Conclusions]This approach can be useful for predicting sea-keeping performance in heavy seas,and the developed software may be used for evaluating sea-keeping hull forms.

关 键 词：舰船 耐波性 规则波浪 切片方法 摇荡耦合 

分 类 号：U661.22[交通运输工程—船舶及航道工程]