基于弱非线性耦合数值模型的渔船骑浪横甩界限探究  

Prediction of Ship Surf-Riding and Broaching in Quartering Seas Based on Weakly Nonlinear Unified Model in Time Domain

作　　者：于立伟[1] 马宁[1] 顾解忡[1] 

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240

出　　处：《中国造船》2015年第A01期127-137,共11页Shipbuilding of China

摘　　要：骑浪横甩是船舶在波浪中失稳模态之一,其具有较强的非线性且多发生于速度较快的小型船舶上,对其发生界限的研究对于船舶设计与安全运营均具有一定实际意义。论文中提出一种考虑船舶操纵性和耐波性运动耦合的六自由度弱非线性统一模型,对一艘ITTC ship A2渔船尾随浪下的骑浪横甩运动进行时域数值模拟。时域模型中,六自由度耐波性运动辐射绕射力采用切片理论计算,并由脉冲响应函数法转化到时域。非线性回复力和入射波力采用瞬时湿表面压力积分方法计算。操纵性运动基于MMG模型,依据统一理论将操纵性与耐波性运动进行耦合计算。文中应用此模型,对不同航速、波高和GM值下渔船在尾随浪中的运动进行时域模拟。通过分析,将结果分类为周期运动、骑浪横甩造成的倾覆、波浪中失稳造成的倾覆等运动模态,并进一步对各模态间发生的界限进行了探究。Surf-riding and broaching is one of the major stability failure modes, which has strong nonlinearity and often happens on small vessels with fast speed. In this paper, a 6-DOF unified model is developed, in which sea-keeping motion at low frequency, maneuvering motion and rudder propeller hydrodynamics are considered for numerical analysis of broaching of the ITTC ship A2 fishing vessel. In the model nonlinear restoring and Froude-Krylov forces are calculated through pressure integration on instantaneous wetted surfaces, while linear radiation and diffraction forces are calculated based on potential theory. The maneuvering model is the 3-DOF surge-sway-yaw MMG model. Then the maneuvering and sea keeping models are combined together based on the Unified theory. Numerical simulations are conducted with various ship speeds, wave heights and GM values. Calculation results can be sorted into several modes like periodic motion, steady surf-riding, capsizing due to broaching and capsizing without broaching. Moreover boundaries between different modes are investigated.

关 键 词：骑浪 横甩 船舶耐波性 船舶操纵性:统一模型 

分 类 号：U661.32[交通运输工程—船舶及航道工程]