狄少丞, 王庆, 薛彦卓, 李佳霖. 破冰船冰区操纵性能离散元分析[J]. 工程力学, 2018, 35(11): 249-256. DOI: 10.6052/j.issn.1000-4750.2017.09.0698
引用本文: 狄少丞, 王庆, 薛彦卓, 李佳霖. 破冰船冰区操纵性能离散元分析[J]. 工程力学, 2018, 35(11): 249-256. DOI: 10.6052/j.issn.1000-4750.2017.09.0698
DI Shao-cheng, WANG Qing, XUE Yan-zhuo, LI Jia-lin. MANOEUVRABILITY ANALYSIS OF AN ICEBREAKER BASED ON DISCRETE ELEMENT METHO[J]. Engineering Mechanics, 2018, 35(11): 249-256. DOI: 10.6052/j.issn.1000-4750.2017.09.0698
Citation: DI Shao-cheng, WANG Qing, XUE Yan-zhuo, LI Jia-lin. MANOEUVRABILITY ANALYSIS OF AN ICEBREAKER BASED ON DISCRETE ELEMENT METHO[J]. Engineering Mechanics, 2018, 35(11): 249-256. DOI: 10.6052/j.issn.1000-4750.2017.09.0698

破冰船冰区操纵性能离散元分析

MANOEUVRABILITY ANALYSIS OF AN ICEBREAKER BASED ON DISCRETE ELEMENT METHO

  • 摘要: 针对浮冰区与平整冰区中航行船舶冰阻力与操纵性的预报问题,采用冰-水-船相互作用数值模型对“雪龙”船在浮冰区与平整冰区中的回转运动特性进行了数值分析。在数值模型中,采用具有黏结破碎特征的球形离散元模型来模拟冰盖的破坏过程,采用球体-三角形接触模型来模拟船-冰之间的碰撞过程,建立了考虑船舶桨力、舵力及水动力的六自由度操纵运动方程。在此基础上对船舶在不同厚度(1.2 m~1.7 m)、不同密集度(40%,60%,80%)浮冰区与不同厚度(0.8 m~1.2 m)平整冰区行进时的破冰阻力及回转特性进行了数值模拟。模拟结果表明:在相同厚度的浮冰区航行时冰阻力小于平整冰区航行的阻力值;浮冰区中回转圈直径约为敞水中回转直径的1倍~2倍;平整冰中回转直径约为敞水中回转直径的2倍~6倍。

     

    Abstract: This paper presents a numerical solution to the prediction of ice resistance and maneuverability of an ice breaker in ice regions, which was solved in the time domain by the discrete element method (DEM) and the maneuvering equation. The breaking process of an intact ice sheet by an advancing ice breaker was investigated by a bonded particle model in the discrete element method. The bonded elements can be broken in the process of the interaction between the ice sheet and the ship hull. The ship hull is constructed with triangular elements and treated as a six degrees of freedom system to simulate maneuvering in level and floe ice. The equations of motion for maneuvering including propeller force, rudder force and hydrodynamic force were adopted in this simulation. The influences of the ice thicknesses (1.2 m~1.7 m) and ice concentrations (40%, 60%, 80%) for floe ice and ice thickness (0.8 m~1.2 m) for level ice on the ice resistance and maneuverability of the ship were numerically established. The simulation results by the present method indicate that the ice resistance of the ice breaker in floe ice region has lower value than that in level ice region. The diameters of turning circle in the floe ice region basically coincide with that in open water. The ship has poorer maneuverability in the level ice region, and the diameters of turning circle are two to six times that in open water. This study can aid the prediction of ice resistance and maneuverability of ice breakers in ice-covered fields.

     

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