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极地船舶冰区航行中冰激结构疲劳的累积损伤分析 被引量:2
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作者 季顺迎 王键伟 +1 位作者 袁奎霖 张睿 《海洋学报》 CAS CSCD 北大核心 2023年第7期102-109,共8页
极地船舶在冰区航行中经常与各种类型的海冰发生不同程度的碰撞,充足的疲劳强度储备至关重要。本文提出了基于实测冰载荷的极地船舶结构冰激疲劳的累积损伤分析方法。以“雪龙”号极地考察船为研究对象,通过对我国第8次北极科学考察中... 极地船舶在冰区航行中经常与各种类型的海冰发生不同程度的碰撞,充足的疲劳强度储备至关重要。本文提出了基于实测冰载荷的极地船舶结构冰激疲劳的累积损伤分析方法。以“雪龙”号极地考察船为研究对象,通过对我国第8次北极科学考察中的冰厚和航速等现场测量数据进行统计分析,在冰厚0.5~2.5 m、航速2~12 kn范围内构造冰激疲劳工况,并将二者的联合概率分布作为疲劳工况的发生概率;基于支持向量机方法反演识别出典型工况下的冰载荷时程,通过动力学分析确定关键位置及相应的热点应力,并采用雨流计数法统计应力循环次数;最后通过S-N曲线和Miner线性累积损伤理论进一步计算该航次内的疲劳损伤度,验证了“雪龙”号在冰区航行的安全性。本文对极地船舶结构的抗冰设计和安全评估具有一定的参考意义。 展开更多
关键词 极地船舶结构 冰激疲劳 累积疲劳损伤 现场测量 冰区航行
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锥角对锥体结构抗冰性能影响的离散元分析 被引量:17
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作者 龙雪 宋础 +1 位作者 季顺迎 王跃方 《海洋工程》 CSCD 北大核心 2018年第6期92-100,共9页
在寒区海洋工程中,锥体海洋结构的尺寸参数对其破冰性能具有重要影响。采用具有黏结-破碎功能的离散元方法模拟海冰与锥体结构的相互作用过程中海冰的破坏模式及冰载荷分析。该离散元方法的计算参数通过与渤海油气平台的实测数据对比进... 在寒区海洋工程中,锥体海洋结构的尺寸参数对其破冰性能具有重要影响。采用具有黏结-破碎功能的离散元方法模拟海冰与锥体结构的相互作用过程中海冰的破坏模式及冰载荷分析。该离散元方法的计算参数通过与渤海油气平台的实测数据对比进行了可靠性验证。在此基础上,当设计海域的潮差固定时,对不同锥角下风电单桩锥体结构的冰载荷和海冰破坏模式进行了离散元分析。计算结果表明:锥体冰载荷随锥角的增大而增大,海冰的平均断裂长度则随锥角的增大而减小;当锥角小于70°时海冰的破碎模式主要为弯曲破坏,而当锥角大于70°时海冰破坏模式则主要为挤压破碎。以上研究结果可为冰区海上风电单桩结构的抗冰锥设计提供参考。 展开更多
关键词 海上风电 抗冰锥体结构 锥体角度 海冰荷载 离散元方法
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基于多介质、多尺度离散元方法的冰载荷数值冰水池 被引量:9
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作者 季顺迎 田于逵 《力学学报》 EI CAS CSCD 北大核心 2021年第9期2427-2453,共27页
极地船舶与海洋工程结构冰载荷的确定是其结构抗冰设计、冰区安全运行和结构完整性管理的重要研究内容.当前快速发展的高性能计算技术和多介质、多尺度数值方法为准确、高效地计算结构冰载荷提供了有效的途径,其中以离散元方法为代表的... 极地船舶与海洋工程结构冰载荷的确定是其结构抗冰设计、冰区安全运行和结构完整性管理的重要研究内容.当前快速发展的高性能计算技术和多介质、多尺度数值方法为准确、高效地计算结构冰载荷提供了有效的途径,其中以离散元方法为代表的数值方法取得了出色的研究成果.为此,本文针对目前极地船舶与海洋工程结构对冰载荷及力学响应的工程需求,同时考虑国内外对海冰、工程结构与流体相互耦合的多介质、多尺度数值方法研究现状,对极地船舶与海洋工程数值冰水池的概念、框架、开发技术以及基于离散元方法的软件实现与工程应用进行了论述.数值冰水池在船舶与海洋工程结构冰载荷确定方面具有可靠性、经济性、快速性、扩展性和情景化等显著优势.本文工作借鉴数值水池的研究思路,以典型船舶和海洋平台结构冰载荷及结构力学响应的离散元计算为例,探讨了数值冰水池研究的可行性和工程应用前景,阐述其与理论分析、现场测量和模型试验研究相结合的必要性.以上研究有益于中国在极地船舶与海洋工程领域形成具有独立知识产权的数值计算分析平台,对中国极地海洋强国的战略实施具有很好的启发和指导意义. 展开更多
关键词 极地船舶与海洋工程 冰载荷 离散元方法 数值冰水池 多介质与多尺度
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转动驱动圆角立方体颗粒有序堆积的离散元模拟 被引量:1
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作者 张祺 乔婷 +1 位作者 季顺迎 厚美瑛 《力学学报》 EI CAS CSCD 北大核心 2022年第2期336-346,共11页
宏观颗粒体系的有序堆积研究可以为热系统中微观粒子的自组装提供研究模型,也有助于工业生产中提高颗粒材料的填充率.实验发现圆筒中的圆角立方体颗粒受容器往复旋转剪切作用会实现有序堆积.为探究旋转圆筒中立方体颗粒有序堆积过程的... 宏观颗粒体系的有序堆积研究可以为热系统中微观粒子的自组装提供研究模型,也有助于工业生产中提高颗粒材料的填充率.实验发现圆筒中的圆角立方体颗粒受容器往复旋转剪切作用会实现有序堆积.为探究旋转圆筒中立方体颗粒有序堆积过程的内部结构演化过程和动力学机理,采用超二次曲面方程构造了圆角立方体颗粒,基于离散元方法对旋转剪切作用下圆角立方体颗粒有序堆积过程开展数值模拟研究.模拟复现了实验中立方体颗粒从随机堆积状态向有序致密堆积状态转变的过程,给出了体积分数和有序度参数在容器不同运动条件下随旋转次数增加的变化规律.结果表明,立方体颗粒的体积分数和有序度表现为随着容器旋转次数增加而逐渐增大直至稳定的变化趋势.体系的有序堆积过程由外层颗粒开始逐渐向内部颗粒扩展.通过调控容器旋转角位移发现颗粒完成有序堆积过程所需的特征旋转次数与容器旋转角位移呈现反比例关系.旋转角位移过低,体系只会形成两种颗粒团簇共存的结构,即某一面平行容器底面的颗粒团簇与面对角线平行重力方向的颗粒团簇共存.研究也发现在亚重力环境下立方体颗粒同样可以通过容器的旋转实现有序堆积.重力加速度的减少会抑制立方体颗粒从无序堆积向有序堆积的转变. 展开更多
关键词 离散元方法 立方体颗粒 有序堆积 微重力
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颗粒材料计算力学专题序
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作者 季顺迎 《力学学报》 EI CAS CSCD 北大核心 2021年第9期2355-2356,共2页
颗粒材料广泛地存在于自然环境、工业生产和日常生活等诸多领域,其受加载速率、约束条件等因素的影响具有复杂的力学行为.颗粒材料常与流体介质、工程结构物耦合作用并共同组成复杂的颗粒系统,并呈现出非连续性、非均质性的复杂力学特性... 颗粒材料广泛地存在于自然环境、工业生产和日常生活等诸多领域,其受加载速率、约束条件等因素的影响具有复杂的力学行为.颗粒材料常与流体介质、工程结构物耦合作用并共同组成复杂的颗粒系统,并呈现出非连续性、非均质性的复杂力学特性.目前,离散元方法已成为解决不同工程领域颗粒材料问题的有力工具,然而其在真实颗粒形态的构造、接触算法、颗粒与流体及工程结构的耦合模型、多介质和多尺度问题,以及高性能大规模计算等方面仍面临着诸多亟待解决的问题. 展开更多
关键词 颗粒材料 离散元方法 计算力学 颗粒系统 接触算法 大规模计算 颗粒形态 多尺度问题
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适应极地快速变化海冰模式的研发与挑战 被引量:13
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作者 刘骥平 雷瑞波 +7 位作者 宋米荣 徐世明 季顺迎 苏洁 李志军 王晓春 朱珠 杨朝渊 《大气科学学报》 CSCD 北大核心 2021年第1期12-25,共14页
极地海冰是地球气候系统的重要组成部分,也是气候环境变化的指示器和放大器。极地海冰复杂的多尺度物理过程和极地观测资料的匮乏,给海冰模式的研发带来了巨大的挑战。在过去的半个多世纪中,大气-海冰-海洋的复杂相互作用和冰内物理过... 极地海冰是地球气候系统的重要组成部分,也是气候环境变化的指示器和放大器。极地海冰复杂的多尺度物理过程和极地观测资料的匮乏,给海冰模式的研发带来了巨大的挑战。在过去的半个多世纪中,大气-海冰-海洋的复杂相互作用和冰内物理过程在海冰模式中的数学描述取得了重大的进展,但海冰模式对一些重要物理过程的描述仍很不完善,尤其是近年来极地海冰的快速变化及其物理特性的变化,极大地增加了海冰模式物理参数化方案和模拟结果的不确定性。因此,迫切需要具备完善物理过程、适应海冰多尺度快速变化的高分辨率海冰模式,并应用于全球气候变化的研究和预测以及极地的开发利用。本文从海冰模式的发展历程和现状、极地海冰快速变化给海冰模式带来的挑战以及适应极地快速变化海冰模式的改进和发展研究方向三个方面进行了阐述和讨论。 展开更多
关键词 极地海冰 海冰模式 多尺度快速变化 热力和动力参数化
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基于高性能离散元方法的极区浮式平台冰载荷数值分析 被引量:6
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作者 孔帅 季顺迎 +2 位作者 季少鹏 王迎晖 刚旭皓 《中国舰船研究》 CSCD 北大核心 2021年第5期64-70,共7页
[目的]冰载荷是极区浮式平台结构安全性分析及完整性管理的重要输入,建立快速有效的冰载荷预报技术可保障浮式平台的安全运营。[方法]基于CUDA-C并行处理技术,建立可用于海冰模拟的高性能离散元方法(DEM)。采用Voronoi分割算法生成平台... [目的]冰载荷是极区浮式平台结构安全性分析及完整性管理的重要输入,建立快速有效的冰载荷预报技术可保障浮式平台的安全运营。[方法]基于CUDA-C并行处理技术,建立可用于海冰模拟的高性能离散元方法(DEM)。采用Voronoi分割算法生成平台作业时的碎冰域,其海冰由具有黏结−失效效应的球体单元组成,且黏结单元的破碎由失效准则控制。平台结构由三角单元构成,考虑其在浮力、锚链恢复力及冰载荷共同作用下的六自由度运动。[结果]由模型计算得到,浮式结构在海冰持续作用下的总体冰载荷合理分布在实测数据范围内。[结论]极区浮式平台冰区运行时冰载荷受冰厚影响较大,应配套破冰服务以减弱其作业区域的冰情。 展开更多
关键词 浮式平台 冰载荷 离散元法 平行黏结模型
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基于离散元方法的竖直群桩冰荷载分析 被引量:1
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作者 李辉辉 张宝森 +1 位作者 翟必垚 季顺迎 《南水北调与水利科技》 CAS CSCD 北大核心 2017年第1期126-131,共6页
在高纬度海域或高寒地区的江河中,碎冰对海洋平台桩腿和桥墩等直立群桩结构产生很大的冲击作用,并在一定条件下造成不同程度的破坏。依据碎冰在自然条件下的离散分布特性,采用Voronoi切割算法构造随机分布和具有非规则几何形态的碎冰初... 在高纬度海域或高寒地区的江河中,碎冰对海洋平台桩腿和桥墩等直立群桩结构产生很大的冲击作用,并在一定条件下造成不同程度的破坏。依据碎冰在自然条件下的离散分布特性,采用Voronoi切割算法构造随机分布和具有非规则几何形态的碎冰初始状态,在此基础上采用若干个具有黏结-破碎功能的球形颗粒构造具有一定厚度、尺寸和形状等物理参数的河冰离散单元模型,将竖直群桩简化为刚体结构,从而对碎冰的运移及其对群桩的冲击作用进行数值模拟。在此基础上可确定碎冰撞击下的群桩冰荷载,并分析冰块尺寸、冰速和冰厚对桩结构所受冰荷载的影响。 展开更多
关键词 冰荷载 离散元方法 竖直群桩
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A viscoelastic-plastic constitutive model with Mohr-Coulomb yielding criterion for sea ice dynamics 被引量:10
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作者 ji shunying SHEN Hung Tao +2 位作者 WANG Zhilian SHEN H Hayley YUE Qianjin 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2005年第4期54-65,共12页
A new viscoelastic-plastic (VEP) constitutive model for sea ice dynamics was developed based on continuum mechanics. This model consists of four components: Kelvin-Vogit viscoelastic model, Mohr-Coulomb yielding cr... A new viscoelastic-plastic (VEP) constitutive model for sea ice dynamics was developed based on continuum mechanics. This model consists of four components: Kelvin-Vogit viscoelastic model, Mohr-Coulomb yielding criterion, associated normality flow rule for plastic rehololgy, and hydrostatic pressure. The numerical simulations for ice motion in an idealized rectangular basin were made using smoothed particle hydrodynamics (SPH) method, and compared with the analytical solution as well as those based on the modified viscous plastic(VP) model and static ice jam theory. These simulations show that the new VEP model can simulate ice dynamics accurately. The new constitutive model was further applied to simulate ice dynamics of the Bohai Sea and compared with the traditional VP, and modified VP models. The results of the VEP model are compared better with the satellite remote images, and the simulated ice conditions in the JZ20-2 oil platform area were more reasonable. 展开更多
关键词 sea ice dynamics constitutive model viscous plasticity viscoelastic-plastic model Molar-Coulomb criterion
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Discrete element modeling of ice loads on ship hulls in broken ice fields 被引量:12
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作者 ji shunying LI Zilin +1 位作者 LI Chunhua SHANG jie 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2013年第11期50-58,共9页
Ice loads on a ship hull affect the safety of the hull structure and the ship maneuvering performance in ice-covered regions. A discrete element method (DEM) is used to simulate the interaction between drifting ice ... Ice loads on a ship hull affect the safety of the hull structure and the ship maneuvering performance in ice-covered regions. A discrete element method (DEM) is used to simulate the interaction between drifting ice floes and a moving ship. The pancake ice floes are modelled with three-dimensional (3-D) dilated disk elements considering the buoyancy, drag force and additional mass induced by the current. The ship hull is modelled with 3D disks with overlaps. Ice loads on the ship hull are determined through the contact detection between ice floe element and ship hull element and the contact force calculation. The influences of different ice conditions (current velocities and directions, ice thicknesses, concentrations and ice floe sizes) and ship speeds are also examined on the dynamic ice force. The simulated results are compared qualitatively well with the existing field data and other numerical results. This work can be helpful in the shil3 structure design and the navigation securitv in ice-covered fields. 展开更多
关键词 ice load ship hull discrete element method broken ice
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基于离散元方法的河冰动力过程短期预测模型及应用
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作者 翟必垚 张宝森 +1 位作者 季顺迎 田治宗 《人民黄河》 CAS 北大核心 2021年第10期75-80,共6页
秋末冬初时黄河河道平稳封河对于预防凌汛意义重大,而什四份子作为黄河内蒙古河段主要首封河段备受重视。根据寒区河道具体冰情,基于河冰离散元方法,考虑河流表面冰的动力输移和河流水动力学的相互耦合作用,建立了针对特定重点河段的短... 秋末冬初时黄河河道平稳封河对于预防凌汛意义重大,而什四份子作为黄河内蒙古河段主要首封河段备受重视。根据寒区河道具体冰情,基于河冰离散元方法,考虑河流表面冰的动力输移和河流水动力学的相互耦合作用,建立了针对特定重点河段的短期预测模型,可根据实际水力要素、气温、现场冰情等条件进行河冰输移、封河开河等情况的模拟和预测。模型考虑了河道的岸冰边界以及上游来冰情况,包括来冰的密集度、冰块体的尺寸分布、冰块体的冻结强度等因素对河冰输移和卡冰封河过程的影响。基于该预测模型,针对什四份子弯道在不同工况下的封河情况进行研究,结合现场情况探究了流速、来冰量、冰块尺寸、岸冰尺寸等因素对卡冰封河的影响,从冰流量和河道输冰量的角度解释了各要素的影响机理,为特定河段的封河预测工作提供参考。 展开更多
关键词 河冰 封河 离散元方法 数值模型 什四份子弯道
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A modified discrete element model for sea ice dynamics 被引量:5
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作者 LI Baohui LI Hai +2 位作者 LIU Yu WANG Anliang ji shunying 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第1期56-63,共8页
Considering the discontinuous characteristics of sea ice on various scales,a modified discrete element model(DEM) for sea ice dynamics is developed based on the granular material rheology.In this modified DEM,a soft... Considering the discontinuous characteristics of sea ice on various scales,a modified discrete element model(DEM) for sea ice dynamics is developed based on the granular material rheology.In this modified DEM,a soft sea ice particle element is introduced as a self-adjustive particle size function.Each ice particle can be treated as an assembly of ice floes,with its concentration and thickness changing to variable sizes under the conservation of mass.In this model,the contact forces among ice particles are calculated using a viscous-elastic-plastic model,while the maximum shear forces are described with the Mohr-Coulomb friction law.With this modified DEM,the ice flow dynamics is simulated under the drags of wind and current in a channel of various widths.The thicknesses,concentrations and velocities of ice particles are obtained,and then reasonable dynamic process is analyzed.The sea ice dynamic process is also simulated in a vortex wind field.Taking the influence of thermodynamics into account,this modified DEM will be improved in the future work. 展开更多
关键词 sea ice dynamics modified discrete element model contact force model numerical simulation
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Interaction between sea ice/iceberg and ship structures: A review 被引量:4
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作者 ji shunying LIU Shewen 《Advances in Polar Science》 2012年第4期187-195,共9页
For ship structural design and good maneuverability in an ice-covered sea, the local and global load of ice cover on ships should be well understood. This paper reviews the extensive work done on ice loads on ships, i... For ship structural design and good maneuverability in an ice-covered sea, the local and global load of ice cover on ships should be well understood. This paper reviews the extensive work done on ice loads on ships, including: (a) Ice pressure and local load determination based on field and model tests; (b) Global ice loads on ships from full-scale field observations, model tests and numerical models under different ice conditions (level ice and pack ice) and ship operations (maneuvering and mooring). Spe- cial attention is paid to the discrete element simulation of global ice loads on ships; and (c) Analytical solutions and numerical models of impact loads of icebergs on ships for polar navigation. Finally, research potential in these areas is discussed. 展开更多
关键词 sea ice ICEBERG local ice load global ice load ship hull EXPERIMENT numerical simulation
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A hybrid Lagrangian-Eulerian numerical model for sea-ice dynamics 被引量:3
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作者 ji shunying LI Hai +2 位作者 SHEN Hung Tao WANG Ruixue YUE Qianjin 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2007年第5期12-24,共13页
A hybrid Lagrangian - Eulerian (HLE) method is developed for sea ice dynamics, which combines the high computational efficiency of finite difference method (FDM) with the high numerical accuracy of smoothed partic... A hybrid Lagrangian - Eulerian (HLE) method is developed for sea ice dynamics, which combines the high computational efficiency of finite difference method (FDM) with the high numerical accuracy of smoothed particle hydrodynamics (SPH). In this HLE model, the sea ice cover is represented by a group of Lagrangian ice particles with their own thicknesses and concentrations. These ice variables are interpolated to the Eularian gird nodes using the Gaussian interpolation function. The FDM is used to determine the ice velocities at Eulerian grid nodes, and the velocities of Lagrangian ice particles are interpolated from these grid velocities with the Gaussian function also. The thicknesses and concentrations of ice particles are determined based on their new locations. With the HLE numerical model, the ice ridging process in a rectangular basin is simulated, and the simulated results are validated with the analytical solution. This method is also applied to the simulation of sea ice dynamics in a vortex wind field. At last, this HLE model is applied to the Bohai Sea, and the simulated concentration, thickness and velocity match the satellite images and the field observed data well. 展开更多
关键词 hybrid Lagrangian - Eulerian model sea-ice dynamics numerical model
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Tensile strength of sea ice using splitting tests based on the digital image correlation method 被引量:1
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作者 CHEN Xiaodong HE Shuaikang +2 位作者 HE Wenquan WANG Zhaoyu ji shunying 《Advances in Polar Science》 CSCD 2021年第4期374-381,共8页
The splitting test is a competitive alternative method to study the tensile strength of sea ice owing to its suitability for sampling.However,the approach was questioned to the neglect of local plastic deformation dur... The splitting test is a competitive alternative method to study the tensile strength of sea ice owing to its suitability for sampling.However,the approach was questioned to the neglect of local plastic deformation during the tests.In this study,splitting tests were performed on sea ice,with 32 samples subjected to the regular procedure and 8 samples subjected to the digital image correlation method.The salinity,density,and temperature were measured to determine the total porosity.With the advantage of the digital image correlation method,the full-field deformation of the ice samples could be determined.In the loading direction,the samples mainly deformed at the ice-platen contact area.In the direction vertical to the loading,deformation appears along the central line where the splitting crack occurs.Based on the distribution of the sample deformation,a modified solution was derived to calculate the tensile strength with the maximum load.Based on the modified solution,the tensile strength was further calculated together with the splitting test results.The results show that the tensile strength has a negative correlation with the total porosity,which agrees with previous studies based on uniaxial tension tests. 展开更多
关键词 tensile strength splitting test digital image correlation method ice mechanics sea ice
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Characteristics of temporal-spatial parameters in quasi-solid-fluid phase transition of granular materials 被引量:5
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作者 ji shunying SHEN H Hayley 《Chinese Science Bulletin》 SCIE EI CAS 2006年第6期646-654,共9页
The quasi-solid-fluid phase transition of granular materials is closely related to the shear rate and solid concentration in addition to their intrinsic properties. The contact duration and the coordination number are... The quasi-solid-fluid phase transition of granular materials is closely related to the shear rate and solid concentration in addition to their intrinsic properties. The contact duration and the coordination number are two important temporal-spatial parame-ters to describe the granular interaction in phase transition. In this study, characteristics of the contact duration and the coordination number associated with the transition processes are determined using a 3D discrete element model under different shear rates and concentrations. The resulting macroscopic stress and strain-rate relations are discussed. The temporal and spatial parameters provide a linkage between the macroscopic constitutive law and inter- particle micromechanics. 展开更多
关键词 颗粒材料 粒状流动力学 准固-液相变 时空参数
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Probability analysis of contact forces in quasi-solid-liquid phase transition of granular shear flow 被引量:3
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作者 ji shunying 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第2期395-403,共9页
The quasi-solid-liquid phase transition exists widely in different fields,and attracts more attention due to its instinctive mechanism.The structure of force chains is an important factor to describe the phase transit... The quasi-solid-liquid phase transition exists widely in different fields,and attracts more attention due to its instinctive mechanism.The structure of force chains is an important factor to describe the phase transition properties.In this study,the discrete element model(DEM) is adopted to simulate a simple granular shear flow with period boundary condition on micro scale.The quasi-solid-liquid phase transition is obtained under various volume fractions and shear rates.Based on the DEM results,the probability distribution functions of the inter-particle contact force are obtained in different shear flow phases.The normal,tangential and total contact forces have the same distributions.The distribution can be fitted as the exponential function for the liquid-like phase,and as the Weibull function for the solid-like phase.To describe the progressive evolution of the force distribution in phase transition,we use the Weibull function and Corwin-Ngan function,respectively.Both of them can determine the probability distributions in different phases and the Weibull function shows more reasonable results.Finally,the force distributions are discussed to explain the characteristics of the force chain in the phase transition of granular shear flow.The distribution of the contact force is an indicator to determine the flow phase of granular materials.With the discussions on the statistical properties of the force chain,the phase transition of granular matter can be well understood. 展开更多
关键词 granular materials quasi-solid-liquid phase transition force chain statistical characteristics simple shear flow
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