ONR内倾船波浪中复原力臂非线性现象试验和数值研究  

Experimental and numerical study on the nonlinear roll restoring arm of ONR tumblehome hull

作　　者：卜淑霞[1] 张进丰[1] 黄苗苗[1] 鲁江[1] 顾民[1] BU Shu-Xia;ZHANG Jin-Feng;HUANG Miao-Miao;LU Jiang;GU Min(National Key Laboratory of Science and Technology on Hydrodynamics,China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心水动力学重点实验室,江苏无锡214082

出　　处：《船舶力学》2021年第5期535-547,共13页Journal of Ship Mechanics

基　　金：工信部高技术船舶项目([2017]614);国家自然科学基金资助项目(52001285)。

摘　　要：船舶波浪稳性中参数横摇和纯稳性丧失是与波浪复原力臂变化有关的失效模式,波浪中复原力臂的变化是影响这些失效模式预报精度的关键因素。本文以ONR内倾船型为研究对象,通过试验和数值方法研究了横摇复原力臂的变化。首先采用半拘束模型(垂荡、纵摇自由,固定横倾角)试验测量波浪中船模复原力的变化;其次采用三维时域混合源法建立波浪中复原力臂的数值计算方法,在常规Froude-Krylov力假设的基础上,进一步考虑辐射力和绕射力对横摇复原力的影响,并在速度势的计算中引入精确物面条件,沿瞬时湿表面积分计算动态辐射力和绕射力的成分;最后通过试验结果和数值计算结果的比较,以及复原力臂组成成分的分析、近似物面非线性条件和精确物面条件计算结果的对比等,详细分析了ONR内倾船型波浪中复原力臂的非线性现象。研究表明:顶浪中常规Froude-Krylov力假设不够完善,随着航速、波陡、横倾角度的增加,波浪中复原力臂的非线性现象十分明显,辐射力和绕射力对复原力臂的贡献是非线性现象的主要原因;基于精确物面条件计算动态辐射力和绕射力引起的复原力臂变化可以更好地反应复原力臂的非线性现象。The stability failure modes of parametric rolling and pure loss of stability are related to roll restor⁃ing arm variation in waves,which is one of the critical factors for accurate prediction of these failure modes.The roll restoring arm variation in waves of an ONR tumblehome hull studied by experiment and numerical methods is introduced in this paper.Firstly,the captive model tests are conducted for the measurement of the roll restoring arm in different wave conditions and different heeling angles.Secondly,the three-dimensional hybrid time domain panel method is used for the calculation of the roll restoring arm,in which the effects of radiation and diffraction on the roll restoring arm are further considered based on the conventional Froude-Krylov force assumption.The exact body boundary condition is introduced into the calculation of velocity po⁃tential,then the component caused by dynamic radiation and diffraction forces can be obtained by integrating the pressure along the instantaneous wetted surface.Finally,the nonlinearity of the roll restoring arm of the ONR tumblehome hull is systematically studied by comparison of the simulation results with the experimen⁃tal ones,analysis of the different components of roll restoring arm,and comparison of the results calculated based on approximate body boundary condition and exact body boundary condition.It is shown that the con⁃ventional Froude-Krylov force assumption is not good enough in head waves.With the increase of ship speed,wave steepness and heeling angles,the nonlinearity of the roll restoring arm variation becomes increas⁃ingly obvious.The contribution of radiation and diffraction moments to the roll restoring arm is the main rea⁃son for the nonlinearly,so both the radiation and diffraction moments should be considered.The variation of the roll restoring arm caused by dynamic radiation and diffraction moments based on the exact body boundary condition can better reflect the nonlinearity of roll restoring arm.

关 键 词：横摇复原力臂变化 三维时域混合源法 精确物面 IMO第二代完整稳性衡准 

分 类 号：U661.229[交通运输工程—船舶及航道工程]