Numerical investigation and its application on the falling motion of freefall lifeboat  

作　　者：Shaoyang Qiu Hongxiang Ren Teng Zhang Xiaobin Qian Fei Wan Lei Wang 

机构地区：[1]Navigation College,Dalian Maritime University Dalian,Liaoning 116026,P.R.China [2]State Key Laboratory of Structural Analysis for Industrial Equipment School of Naval Architecture Engineering Dalian University of Technology,Dalian 116024,P.R.China [3]Henan University of Urban Construction Pingdingshan 467099,Henan,P.R.China [4]Navigation Branch,Hebei Jiaotong Vocational and Technical College,Tianjin 300381,P.R.China

出　　处：《International Journal of Modeling, Simulation, and Scientific Computing》2021年第6期1-16,共16页建模、仿真和科学计算国际期刊（英文）

基　　金：The authors thank the financial support provided by National Natural Science Foundation of China(Grant No.52071312);Liaoning Provincial Natural Science Foundation shipping joint fund project(Grant No.2020-HYLH-29);Provincial postgraduate education and teaching achievement award cultivation project(Grant No.YJG2020601).

摘　　要：In order to improve the simulation accuracy for free-fall lifeboat in ship life-saving training system,this paper analyzes and models the motion of boat’s launching from the skid.The whole launching is divided into four phases,namely:sliding down,rotation,free fall and water entry.According to the theory of momentum and strip theory,hydrodynamic forces of the boat at water entry are calculated under the effect of waves.The method of interpolation is used for calculating the half width and added mass of cross-sections at water entry.The model is used for numerical investigation about the boat launching from skid under different conditions and applied to ship life-saving simulation training system.The following conclusions are finally obtained:(1)When the initial inclination angle is 30◦,the horizontal distance between the point of water entry of the boat and the lower end of the slide is about 7.2 m.The horizontal distance will be smaller,when the initial inclination angle increases.There is no obvious law between forward distance and waves.(2)When the initial inclination angle is 45◦,the setback may occur after the boat entering the wave.When the initial angle is 60◦,the setback occurs after the boat entering the water.(3)When the center of gravity is 1.5 m in front of the midship of the boat,the boat will turn over.

关 键 词：LIFEBOAT free fall water entry motion model regular wave irregular wave 

分 类 号：R78[医药卫生—口腔医学]