极区船舶及海洋结构冰荷载的离散元分析

 冰荷载是影响极区船舶及海洋结构振动响应和疲劳寿命的重要因素。针对海冰的离散特性，分别采用具有黏结-破碎效应的球体单元、扩展圆盘单元以及基于闵可夫斯基和方法的扩展多面体单元构造海冰离散单元模型，分析了船体、固定式、自升式以及浮式海洋结构的冰荷载特性及分布规律。此外，为计算海冰作用下海洋结构的振动响应，建立了相应的冰激结构振动的离散元-有限元模型。在上述基础上自主研发了基于图像处理单位（GPU）并行算法的海冰离散元软件（IceDEM），实现了对船舶以及海洋平台结构冰荷载离散元分析的大规模计算。

Analysis of ice load on ship and offshore structure in polar region with discrete element method

The ice load is an important factor for vibration and fatigue of ship and offshore structure in polar region. For analyzing the ice load on different type offshore structures, the bonding-breaking effect between bonded spherical elements, the expansion disk element, and the polyhedron element based on the Minkowski sum theory are respectively adopted to construct the discrete element model of sea ice. Additionally, the ice-induced vibration of the jacket platform is calculated by using the coupled discrete element-finite element numerical method. And IceDEM, a software tool for sea ice DEM simulation based on GPU is developed to improve the computational efficiency. The present study can not only promote the development of discrete element method in polar marine engineering but also assist the design of ship and offshore structure in ice-covered fields.