STF切片理论的实用数值计算方法改进  

Improvement of practical numerical calculation method of STF strip theory

作　　者：吴海鹏 刘寅东 WU Hai-peng;LIU Yin-dong(Naval Architecture and Ocean Engineering College,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]大连海事大学船舶与海洋工程学院,辽宁大连116026

出　　处：《大连海事大学学报》2020年第1期10-19,共10页Journal of Dalian Maritime University

摘　　要：根据STF切片理论,建立船舶在斜浪规则波下直航运动的五个自由度耦合方程,并考虑航速及球鼻艏对水动力系数的影响加以修正.此外,针对原计算公式中横摇阻尼系数项不考虑流体黏性的问题,引入Ikeda半经验公式对该项进行非线性修正,采用辛普森积分法和四阶龙格-库塔微分法分别对船舶水动力系数和各自由度随时间历程的变化进行数值计算.以Wigley系列船型和某教学实习船为例,将水动力系数、波浪扰动力及力矩和各自由度运动幅值与相关试验值、其他文献结果以及商业软件数值仿真结果对比.结果表明,经过非线性修正后,横摇运动响应结果与商业软件数值仿真结果更加逼近,其他自由度的运动响应结果与对应的试验值和其他文献结果也都较为吻合,证明了本文计算方法的可行性,且具有一定的实用价值.Based on STF strip theory,five DOF coupled motion equations of a ship moving in regular oblique waves were established and corrected by considering the influence of speed and bulbous bow on hydrodynamic coefficients.In addition,Ikeda’s semi-empirical formula was introduced to modify the roll damping coefficient term in the original formula,which did not consider the fluid viscosity.Simpson integral method and fourth-order Runge-Kutta differential method were used to numerically calculate the hydrodynamic coefficients and variation of freedom degrees with time history,respectively.Taking Wigley series ships and the teaching practice ship as examples,the hydrodynamic coefficients,wave disturbance forces and moments,and the motion amplitudes of freedom degrees were compared with the relevant experimental values,other literature results and the numerical simulation results of commercial software.The results show that the rolling motion amplitude is more approximate to the numerical simulation results of commercial software by nonlinear correction,and the results of other degrees of freedom are in good agreement with the experimental values and other literature results,which prove the feasibility of the proposed calculation method and the practical engineering value.

关 键 词：STF切片理论 船舶运动 数值计算 横摇阻尼系数 非线性修正 

分 类 号：U661.3[交通运输工程—船舶及航道工程]