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
针对电池储能等常规储能不能快速响应能源枢纽风电出力短期扰动问题,文中将混合储能引入能源枢纽当中,考虑混合储能在枢纽运行中的损耗,提出了能源枢纽日运行成本最优时的储能容量规划模型。然后基于信息间隙决策理论(Information Gap D...针对电池储能等常规储能不能快速响应能源枢纽风电出力短期扰动问题,文中将混合储能引入能源枢纽当中,考虑混合储能在枢纽运行中的损耗,提出了能源枢纽日运行成本最优时的储能容量规划模型。然后基于信息间隙决策理论(Information Gap Decision Theory,IGDT)在风险规避策略与机会寻求策略下,建立考虑风电出力不确定性的鲁棒与机会模型,为决策者提供能源枢纽容量规划方案。最后通过算例分析,证明使用混合储能的能源枢纽对风电出力存储转化效率更高,日运行成本更少。同时基于IGDT混合储能容量规划模型,能够为决策者提供在满足预期运行目标时风电出力最大/最小波动范围,分析风电出力不确定性与混合储能容量之间的关系,通过定量分析为不同风险偏好策略提供容量规划依据。展开更多
基金The Special Funding for National Marine Commonwealth Industry of China under contract Nos 201105016 and 2012418007the National Natural Science Foundation of China under contract No.41176012
文摘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.
文摘针对电池储能等常规储能不能快速响应能源枢纽风电出力短期扰动问题,文中将混合储能引入能源枢纽当中,考虑混合储能在枢纽运行中的损耗,提出了能源枢纽日运行成本最优时的储能容量规划模型。然后基于信息间隙决策理论(Information Gap Decision Theory,IGDT)在风险规避策略与机会寻求策略下,建立考虑风电出力不确定性的鲁棒与机会模型,为决策者提供能源枢纽容量规划方案。最后通过算例分析,证明使用混合储能的能源枢纽对风电出力存储转化效率更高,日运行成本更少。同时基于IGDT混合储能容量规划模型,能够为决策者提供在满足预期运行目标时风电出力最大/最小波动范围,分析风电出力不确定性与混合储能容量之间的关系,通过定量分析为不同风险偏好策略提供容量规划依据。
